Condition Analysis
AI-powered assessment using site data and 14-day weather history
Despite one dry day since the last rain (2.1mm on Aug 25), Corby's Crag has experienced a very wet recent period — 16.4mm on Aug 19, 6.0mm on Aug 20, and further showers since — totalling 45.1mm over 28 days. The sheltered, below-road-level position, high humidity (90% today, 81% average over the past week), and the crag's known tendency to channel runoff mean internal moisture is very likely still present, and a major wet spell is forecast from tomorrow.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Corby's below-road-level position channels runoff from the road and hillside above onto the rock face, meaning it can be wet even when nearby crags appear dry.
- The rock here is notably more friable and porous than other Northumberland Fell Sandstone — after the repeated recent showers it is likely to have developed 'scrittle' (loose surface grit) that makes holds unreliable even if the surface looks dry.
- The sheltered aspect traps humid air and limits wind-assisted drying, which is especially problematic given today's 90% humidity and light easterly wind.
- Heavy rain is forecast from tomorrow (12mm Aug 27, 11.2mm Aug 28, further showers through Aug 31) — any marginal drying achieved today will be completely undone.
Warnings
2
- The rock at Corby's Crag is more friable than typical Fell Sandstone — climbing on inadequately dried rock risks permanent hold breakage and route damage.
- A prolonged wet spell is forecast from Aug 27–31 (36mm total); conditions will deteriorate significantly and the crag is unlikely to be climbable for at least a week.
Reasoning
The crag received 2.1mm just yesterday (Aug 25) on top of significant rain on Aug 19 (16.4mm) and Aug 20 (6.0mm), with only brief dry spells in between — internal moisture levels in this highly porous, sheltered sandstone are almost certainly elevated.
Only one full dry day has elapsed since the last rain, humidity has been at or above 80% throughout, and the sheltered position with light easterly winds provides minimal evaporative drying — far short of the 48+ hours of dry, breezy conditions this crag needs.
With repeated wetting events over the past two weeks and inadequate drying intervals, the rock's compressive strength is likely significantly reduced, and the known 'scrittle' problem makes hold breakage a real concern.
Late August temperatures (12–18°C) are adequate for drying in principle, but the persistently high humidity and overcast skies are negating any seasonal advantage.
Contributing Factors
6
45.1mm over the past 28 days with significant events on Aug 19 (16.4mm), Aug 20 (6.0mm), and Aug 25 (2.1mm) have kept the porous rock repeatedly saturated.
Only one consecutive dry day since the last rain, far short of the 48–72+ hours needed for this particularly porous and sheltered crag.
Today's humidity is 90% with an average of 81% over the past week, severely limiting evaporative drying even during dry hours.
The below-road-level, sheltered setting limits wind exposure to the rock face and traps humid air, prolonging drying times well beyond typical Fell Sandstone crags.
36.1mm of rain is forecast over the next five days starting tomorrow, which will completely resaturate the rock and reset any drying progress.
Temperatures of 15–19°C today are warm enough to support some drying in principle, but the effect is overwhelmed by humidity and shelter.
Recommendations
3
- Do not climb at Corby's Crag today — the rock has not had adequate drying time after repeated recent rain, and conditions will worsen significantly from tomorrow.
- Given the forecast of 36mm of rain over the next five days, consider alternative non-porous rock venues (e.g. whinstone at Bowden Doors area or The Wanneys if conditions allow) for the coming week.
- If you visit after the forecast wet spell ends, check the crag top and base for dampness, and test holds carefully for 'scrittle' before committing to any route — this crag will need at least 3–4 days of dry, breezy weather after the rain stops.
Previous Analyses
Marginal — Assess Conditions
55%
57 days ago
Three dry days since the heavy rain on Aug 19–20 (22.5mm combined) have allowed some drying, but Corby's sheltered, below-road-level position and high average humidity (~80%) mean internal moisture likely persists, especially on the NW-facing sections. The south-facing walls may be climbable this afternoon if visually dry, but conditions should be carefully assessed on arrival — and the forecast shows deteriorating weather from tomorrow onward.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Corby's sits below road level and channels runoff from above onto the rock face, meaning it can remain wet long after surrounding crags have dried — check the crag top and upper sections for seepage before committing.
- The rock here is notably more friable and porous than typical Northumberland sandstone, and develops 'scrittle' (loose grit on holds) even after the surface appears dry — this is a sign internal moisture is still migrating outward.
- The sheltered position traps humid air and limits wind-assisted drying, so the standard 48–72 hour drying rule after heavy rain should be extended here, particularly for the NW-facing walls.
- Soft Fell Sandstone at this crag is particularly susceptible to top-rope damage; leading on natural gear is strongly preferred to protect the rock.
Warnings
2
- The rock may appear surface-dry while remaining saturated internally — test holds carefully and abort immediately if you feel any grit or softness.
- Do not top-rope at this crag; the soft Fell Sandstone is particularly vulnerable to rope abrasion damage.
Reasoning
The 16.4mm on Aug 19 and 6.0mm on Aug 20 represent significant wetting of this highly porous rock, and although three dry days have passed, the sheltered position, average humidity of 80%, and moderate temperatures (~13–17°C) suggest internal moisture may not have fully cleared, particularly in the NW-facing sections and at the base.
Three consecutive dry days with moderate SW/S winds (12–18 km/h) and temperatures of 13–17°C provide reasonable surface drying, but the sheltered below-road setting significantly reduces effective airflow at the rock face, and the south-facing sections will have benefitted far more than the NW-facing walls.
The friable, high-porosity Fell Sandstone at Corby's is at elevated risk of hold breakage and scrittle if internal moisture remains above ~1% saturation, and the known tendency for runoff channelling from above increases the likelihood of localised damp patches.
Mid-summer temperatures and longer daylight hours are favourable for drying, but the recent wet spell (44.4mm over 28 days) and high humidity have limited the seasonal advantage at this sheltered site.
Contributing Factors
7
16.4mm on Aug 19 plus 6.0mm on Aug 20 would have deeply saturated this highly porous rock, requiring extended drying at this sheltered venue.
Dry weather since Aug 21 (with only a trace 0.1mm) has allowed surface drying, approaching the minimum 48–72 hour guideline for heavy rain.
The sheltered, below-road-level setting traps humid air and limits wind-assisted evaporation, significantly extending drying times compared to exposed crags.
Average humidity of 80% over the last seven days substantially slows evaporation rates, and today's morning humidity was 88–89% before dropping to ~53–57% mid-afternoon.
Temperatures of 15–17°C today with sunshine from midday provide reasonable evaporative energy, especially on the south-facing walls.
Rain returns from tomorrow (0.4mm) and builds to heavy rain by Aug 28 (17.5mm), meaning today is the last viable window before a prolonged wet spell.
The below-road position channels surface water onto the crag even from light rain, and residual drainage from the Aug 19–20 event may still be contributing moisture from above.
Recommendations
3
- If climbing today, focus on the south-facing walls during the afternoon dry window (12:00–17:00) and physically check the crag top and base for dampness before committing — if the ground at the base is moist, walk away.
- Avoid the NW-facing sections entirely as these will have had the least drying benefit and are most likely to retain internal moisture.
- Do not plan climbing from tomorrow onward — the forecast shows increasing rain and humidity through Aug 28–29, and Corby's will need several dry days after that spell to recover.
Do Not Climb
35%
58 days ago
Heavy rain on 19th August (16.4mm) followed by further rain on 20th (6.0mm) means Corby's Crag has had only two full dry days in its sheltered, below-road-level position — far too few to dry this porous, friable Fell Sandstone reliably. With high recent humidity (averaging 82%) and the crag's known tendency to channel runoff from above, internal moisture is very likely still present despite any surface drying.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Corby's Crag sits below road level and channels runoff from the road and hillside above onto the rock face, meaning it receives more water than open precipitation alone and can be wet when nearby crags are dry.
- The rock here is described as more friable and porous than typical Northumberland Fell Sandstone, and develops 'scrittle' (loose grit on holds) after rain that requires a long sustained dry spell to clear — two days is insufficient.
- The sheltered position that makes it warm on sunny days also drastically slows drying by limiting airflow across the rock surface, so standard drying guidelines should be extended significantly.
- The NW-facing sections will have received minimal direct sun over the past two dry days and should be treated as still wet internally.
Warnings
3
- Surface-dry appearance is misleading at Corby's Crag — the porous, friable rock can look climbable while being dangerously weakened internally.
- Rain is forecast from the 25th onwards with a very heavy event on the 27th (17.2mm), so conditions will deteriorate further rather than improve this week.
- Top-roping on this soft Fell Sandstone causes accelerated damage even in dry conditions; it should be strictly avoided when any moisture is present.
Reasoning
16.4mm fell on 19 August and 6.0mm on 20 August, with only a trace on the 21st and two dry days since — given the crag's sheltered position, high porosity, and runoff channelling from above, internal moisture is almost certainly still significant.
Two dry days with moderate temperatures (~14–17°C), humidity around 74–82%, and light-to-moderate wind in a sheltered setting provide only superficial drying; the rock likely appears dry on the surface while remaining saturated internally — the most dangerous scenario.
With the rock's noted friability and high porosity, climbing now risks hold breakage and accelerated erosion; the 'scrittle' effect described in condition notes is very likely still active after only two dry days.
Late August temperatures are adequate for drying in principle but the recent wet spell (28mm in the last 7 days) and high humidity have limited the effectiveness of the summer warmth.
Contributing Factors
7
16.4mm on 19 Aug and 6.0mm on 20 Aug represent a significant wetting event for this highly porous sandstone, requiring far more than two dry days to clear.
Two consecutive dry days is well below the minimum 48–72+ hours of good drying conditions needed after heavy rain, especially at this sheltered venue.
The crag's sheltered, sunken position severely limits airflow and extends drying times well beyond open-aspect crags.
The below-road-level setting means the rock receives additional water from road and hillside drainage, adding moisture beyond direct rainfall.
Average humidity of 82% over the last seven days significantly impedes evaporation and net drying.
Temperatures around 15–17°C and moderate wind provide some drying potential, but not enough to overcome the sheltered position and recent heavy rain.
This crag's rock is noted as more friable and porous than typical Fell Sandstone, making it especially vulnerable to moisture damage and the 'scrittle' effect.
Recommendations
3
- Do not climb today — the rock almost certainly retains significant internal moisture despite possible surface drying, and the 'scrittle' effect makes holds unreliable.
- If conditions remain dry through the 24th, an on-site assessment on the 25th morning could be considered, but the forecast shows rain returning that day — it is unlikely a safe window will open this week.
- Check the crag top and base for dampness before any future visit; if the ground at the base is not sandy-dry, the rock is still too wet.
Do Not Climb
88%
59 days ago
Corby's Crag has received 22.4mm of rain in the last four days (including 16.4mm on August 19th and 6.0mm on August 20th), with only one full dry day since. Given the crag's sheltered, below-road-level position and its exceptionally porous, friable sandstone, the rock will still be holding significant internal moisture and is unsafe to climb on today.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The below-road-level position channels runoff from the road and surrounding ground onto the crag face, meaning the rock receives far more water than open-air rainfall totals suggest — after 22mm in recent days, seepage from above will persist for days.
- This sandstone is described as more friable and porous than most Northumberland Fell Sandstone, meaning it absorbs water faster and develops 'scrittle' (loose grit) on holds even after the surface appears dry — a hidden hazard.
- The sheltered position with minimal wind exposure (only 12–19 km/h recently) drastically slows evaporation; the crag needs sustained dry, windy weather to clear moisture properly.
- The NW-facing sections will have received almost no direct sun recently and will be slowest to dry; even the south-facing sections are compromised given the volume of recent rain and runoff from above.
Warnings
2
- Climbing on this rock today risks permanent hold breakage on an irreplaceable Fell Sandstone crag — the internal moisture from 22mm of rain in the last 3 days cannot have dissipated in one dry day.
- Surface-dry appearance is deceptive at Corby's — the below-road runoff and high porosity mean the interior can remain dangerously saturated while the face looks climbable.
Reasoning
With 16.4mm on Aug 19, 6.0mm on Aug 20, and a trace on Aug 21, followed by only one dry day (today), the rock is almost certainly still saturated internally — especially given this crag's above-average porosity and the additional runoff it receives from above.
Only one full dry day has elapsed since heavy rain, with light winds (12–19 km/h) and moderate-high humidity (73–82%); the sheltered position further impedes airflow, meaning drying has barely begun — a minimum of 48–72 hours of good drying conditions is needed after this volume of rain, and this crag typically needs even longer.
The friable, highly porous sandstone is at serious risk of hold breakage and surface damage; at even 1% saturation the rock loses significant strength, and after 22mm of rain with minimal drying time the internal moisture level will be far above this threshold.
Mid-to-late August temperatures are moderate (13–17°C) but the recent week has been unusually cool and humid (average 12.7°C, 83% humidity), providing poor drying conditions for the time of year.
Contributing Factors
6
22.4mm fell across Aug 19–20, with only one full dry day since — far short of the minimum 48–72 hours needed for heavy rain on porous sandstone.
The crag sits below road level in a sheltered hollow, channelling runoff onto the face and blocking the wind that would otherwise accelerate drying.
Average humidity over the past week is 83%, severely limiting evaporative drying even on nominally dry days.
Recent winds of 12–19 km/h are modest, and the sheltered position means effective wind at the rock face is likely even lower, slowing moisture removal.
Temperatures around 15–17°C provide some drying capacity but are well below the warm, sunny conditions that would drive rapid evaporation.
This crag's sandstone is noted as more friable and porous than typical Fell Sandstone, meaning it absorbs more water, weakens more, and develops treacherous 'scrittle' on holds.
Recommendations
3
- Do not climb today — the rock has had only one dry day since 22mm of rain and will still be significantly weakened internally.
- Wait for at least 3–4 consecutive dry days with humidity below 75% and some wind before considering a visit; check the crag top for dampness before committing.
- If visiting later this week, test holds carefully at ground level first and look for 'scrittle' (loose grit) on surfaces — if present, the rock has not dried sufficiently.
Do Not Climb
90%
60 days ago
Corby's Crag has received 24.3mm of rain over the last three days (Aug 19–21), including a heavy 16.4mm event on Aug 19, with today still recording 1.9mm. Given the crag's sheltered, below-road-level position that channels runoff and its highly porous, friable Fell Sandstone, the rock will be thoroughly saturated internally and conditions are clearly unsuitable for climbing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The below-road-level position channels runoff from the road and surrounding ground onto the rock face, meaning Corby's receives more water than open-aspect crags and stays wet long after other Northumberland venues have dried.
- The rock here is described as more friable and porous than typical Northumberland sandstone, and develops 'scrittle' (loose grit) on holds after rain — even once the surface appears dry, holds can be dangerously weak and gritty.
- The sheltered aspect with limited wind penetration significantly retards evaporation; after heavy rain a sustained period of dry, breezy weather is needed before conditions are acceptable.
- South-facing sections will dry faster than the NW-facing walls, but the sheltered bowl setting means neither aspect benefits from strong airflow — assess all sections independently on arrival.
Warnings
3
- The rock is currently saturated from 24mm of rain in the last 3 days — climbing now risks permanent hold breakage and route damage on this unusually friable sandstone.
- Surface-dry appearance can be deceptive at Corby's: the sheltered position and runoff from above mean internal saturation persists long after the surface looks climbable.
- Rain is forecast again on Aug 26 (9.5mm), which will reset drying progress — any window for climbing this week is narrow at best.
Reasoning
With 16.4mm on Aug 19, 6.0mm on Aug 20, and 1.9mm today (Aug 21), the rock is fully saturated internally and externally, with runoff from above compounding direct rainfall absorption.
Zero consecutive dry days have elapsed since the last rain; the sheltered position limits wind exposure to light breezes, and moderate humidity (~82%) further suppresses evaporation — meaningful drying has not begun.
At saturation, Fell Sandstone loses 10–50% of its compressive strength; this crag's unusually friable character means hold breakage risk is acute, and climbing now would cause permanent, irreversible damage to routes.
Late August temperatures are moderate (12–17°C) but not high enough to drive rapid drying, and the recent week has averaged only 13°C with 83% humidity — poor drying conditions for summer.
Contributing Factors
6
24.3mm fell over the last three days including a heavy 16.4mm event on Aug 19, thoroughly saturating the porous sandstone.
Rain fell today (1.9mm), so the drying clock has not even started — the 48–72+ hour minimum drying window after heavy rain has not begun.
The crag sits below road level in a sheltered bowl, channelling runoff onto the face and limiting the wind exposure that would accelerate drying.
Humidity has averaged 83% over the past week with today at 82%, significantly slowing evaporation from the rock surface.
Corby's sandstone is noted as more porous and friable than typical Fell Sandstone, making it especially vulnerable to strength loss and 'scrittle' formation when wet.
Temperatures of 12–17°C provide some drying capacity but are not high enough to drive rapid evaporation, especially in sheltered, humid conditions.
Recommendations
3
- Do not climb at Corby's Crag today or in the next two days — the rock is saturated and holds are at serious risk of breakage.
- Wait for a minimum of 3–4 consecutive dry days with moderate wind before considering a visit, and check the crag top and base for dampness before committing.
- If conditions do improve later in the week, lead on gear rather than top-roping to reduce damage to this soft sandstone, and test holds carefully for 'scrittle' before weighting them.
Do Not Climb
93%
61 days ago
Corby's Crag is currently unsafe to climb. Heavy rain yesterday (16mm on Aug 19) followed by further rain today (6.3mm ongoing through the morning) has thoroughly saturated this already moisture-prone crag, and the sheltered, below-road-level position means drying will be very slow even once the rain stops. Multiple days of dry, warm weather are needed before conditions will be acceptable.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Corby's below-road-level position channels runoff from the road and hillside above directly onto the rock face, meaning it receives more water than open rainfall alone and stays wet long after other Northumberland crags have dried.
- The rock here is noted as more friable and porous than typical Fell Sandstone, and develops 'scrittle' (loose surface grit) after rain that persists even when the surface appears dry — a serious grip and hold-breakage hazard.
- The sheltered setting with minimal airflow means wind-assisted drying is greatly reduced; combined with the NW aspect on the main face, effective drying relies heavily on temperature and time rather than wind or direct sun.
- The crag's soft sandstone is particularly vulnerable to top-rope damage; even if surface conditions appear acceptable, internal moisture from this prolonged wet spell could make holds structurally unsound.
Warnings
3
- Climbing on this saturated, friable sandstone risks permanent hold breakage and route damage — do not climb.
- The rock surface may appear dry before the interior has dried; the 'scrittle' phenomenon at this crag means loose grit can persist for days after rain, creating a deceptive and dangerous surface.
- Runoff from the road above may continue to wet the rock face for a day or more after rain stops.
Reasoning
The rock is thoroughly saturated: 16mm fell on Aug 19, 6.3mm today with rain continuing through the morning, and the preceding week saw repeated showers (5.7mm on Aug 17, 1.9mm on Aug 16, 4.5mm on Aug 9) — the crag has had almost no opportunity to dry out, and the below-road runoff compounds the problem.
Despite moderate winds (20–23 km/h today), the sheltered position negates most wind benefit, and with humidity averaging 81% over the past week, evaporation rates are poor; the NW-facing sections will receive almost no direct sun, meaning a minimum of 3–4 dry days is needed from the last significant rainfall.
With near-continuous wetting over recent weeks and the rock's noted extra friability, internal saturation is likely very high, posing serious risk of hold breakage, grain loosening, and the 'scrittle' phenomenon even once surfaces appear dry.
Mid-August should be favourable for drying in principle, but temperatures have dropped well below seasonal norms (13–17°C) and the persistent unsettled pattern with high humidity is significantly slowing recovery.
Contributing Factors
7
16mm on Aug 19 and 6.3mm today, on top of repeated showers throughout the past two weeks totalling nearly 59mm in 28 days, have kept the rock in a near-constantly wet state.
There have been no consecutive dry days since Aug 12–15, and today's rain resets the drying clock entirely.
The crag's sheltered, sunken setting traps moist air and receives road runoff from above, dramatically slowing drying compared to exposed crags.
Average humidity of 81% over the past week severely limits evaporation, and today's humidity reached 97–99% during the rain.
While 22 km/h winds are present today, the sheltered position means little of this reaches the rock face, limiting the drying benefit.
Temperatures of 13–17°C are adequate for some evaporation, though well below the seasonal norms seen earlier (24–29°C on Aug 12–13).
Corby's sandstone is noted as more porous and friable than typical Fell Sandstone, meaning it absorbs water faster and loses more strength when wet.
Recommendations
3
- Do not climb at Corby's Crag today or in the next two days; the rock is saturated and structurally compromised.
- Wait for at least 3 full dry days after the last rain before visiting, and on arrival check the crag top and base for dampness before committing to any route.
- If visiting the area, consider non-porous alternatives such as Whinstone crags (e.g. Kyloe, Bowden Doors' whinstone sections) which are far less sensitive to moisture.
Do Not Climb
90%
62 days ago
Corby's Crag is currently wet and unsuitable for climbing. Rain today (2.2mm), yesterday (5.7mm), and on Aug 16 (1.9mm) means the rock has had no meaningful drying window, and the sheltered, below-road-level position will be channelling runoff onto the face — expect saturated, friable sandstone throughout.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Corby's below-road-level position channels runoff from the road and hillside above directly onto the rock face, meaning it receives more water than open rainfall alone would suggest.
- The crag's noted tendency to develop 'scrittle' (loose grit on holds) after rain makes it unsafe even when the surface appears dry — a prolonged dry spell is needed to clear this.
- The sheltered aspect with minimal wind penetration dramatically slows evaporation; the 10–14 km/h winds forecast over the next two days will have limited effect in this hollow.
- South-facing sections will dry noticeably faster than the NW-facing walls, but the runoff from above affects all aspects equally.
Warnings
2
- Climbing on wet Fell Sandstone causes permanent, irreversible damage to holds — this is especially acute at Corby's where the rock is noted as more friable and porous than other Northumberland crags.
- Surface-dry appearance is deceptive at this crag; the sheltered hollow and runoff from above mean internal saturation persists long after the surface looks climbable.
Reasoning
With 2.2mm today, 5.7mm on Aug 17, and 1.9mm on Aug 16 — plus intermittent showers on Aug 9 (4.5mm) and Aug 6 (2.0mm) — the rock has been repeatedly re-wetted with zero consecutive dry days, and the porous Fell Sandstone will be saturated internally.
The sheltered, below-road-level position severely limits wind-driven drying; today's light winds (2–10 km/h) and high humidity (83%) provide essentially no evaporative force, and the crag has not had a single full dry day since Aug 15.
With repeated wetting events and no drying window, the sandstone will have lost 30%+ of its compressive strength, and the characteristic 'scrittle' on holds makes breakage and permanent route damage a serious concern.
Mid-August temperatures (15–17°C) are adequate for drying but the current unsettled pattern with frequent light rain is preventing any meaningful progress; freeze-thaw is not a concern at this time of year.
Contributing Factors
7
2.2mm of rain spread across the early hours and intermittently through the afternoon means the rock is being actively wetted right now.
The last meaningful dry spell ended Aug 15; since then the crag has received rain on Aug 16, 17, and 19 with only a single dry day (Aug 18) in between.
The below-road-level, sheltered setting drastically reduces wind exposure and traps humid air, extending drying times well beyond what open crags would require.
Road and hillside drainage channels extra water onto the face, adding moisture beyond direct rainfall totals.
Average humidity over the last 7 days is 76%, and today peaks at 96%, severely limiting evaporative drying potential.
Temperatures of 15–17°C are adequate for drying but cannot compensate for the lack of wind and high humidity in this sheltered setting.
1.0mm forecast for Aug 20 and 0.3mm for Aug 21 will reset drying progress again before any meaningful improvement can occur.
Recommendations
3
- Do not climb at Corby's Crag today or in the next two days — the rock is wet, friable, and at serious risk of hold damage.
- The earliest realistic window is Aug 23–24 if the forecast dry spell holds; check the crag top for dampness and run your hand over holds to test for 'scrittle' before committing.
- Consider nearby whinstone or limestone alternatives (e.g. Kyloe or Bowden Doors if also dry) which are less moisture-sensitive than Corby's particularly friable sandstone.
Do Not Climb
90%
63 days ago
Corby's Crag has received rain today (2.4mm) on top of recent showers on August 16th (1.9mm) and 17th (4.2mm), totalling 8.5mm in the last three days alone. Given the crag's sheltered, below-road-level position and its notably friable, porous Fell Sandstone, the rock will be thoroughly saturated internally and conditions are clearly unsuitable for climbing today or in the near future.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Corby's Crag sits below road level, which channels runoff from above directly onto the rock face — it can remain wet even when nearby crags have dried.
- The rock here is more friable and porous than typical Northumberland Fell Sandstone, developing a loose 'scrittle' layer on holds even after the surface appears dry, requiring an extended drying period.
- The sheltered position means wind — the primary drying agent — is significantly attenuated at the crag face, prolonging drying times well beyond what open-aspect crags would need.
- On warm, sunny days the south-facing sections can feel deceptively pleasant and appear dry on the surface while remaining dangerously saturated internally.
Warnings
3
- Climbing on this saturated, friable Fell Sandstone risks permanent hold breakage and irreversible route damage — please wait.
- The surface may appear dry later today in the afternoon sun but the interior will remain dangerously weakened; do not be deceived by surface appearance.
- Heavy rain (16.2mm) is forecast for August 20th which will reset any drying progress entirely.
Reasoning
Rain fell today (2.4mm early morning) following 1.9mm on the 16th and 4.2mm on the 17th, with no meaningful dry interval between events — the rock is almost certainly saturated through its full depth, especially given the above-road runoff channelling onto the face.
Despite moderate westerly winds today (up to ~26 km/h), the sheltered below-road position will severely limit airflow at the rock surface, and humidity has been above 80% for much of the morning — effective drying will not begin until well into the afternoon and will be far too brief to clear three days of accumulated moisture from this highly porous stone.
With the rock saturated from repeated recent rain events and the notably friable nature of this particular outcrop, hold breakage risk is high and the characteristic 'scrittle' loose-grain layer will be present on holds, posing both safety and permanent damage risks.
Mid-August temperatures (15–17°C) are reasonable for drying but humidity has been persistently elevated (73% seven-day average), and the forecast shows continued unsettled, cool, and humid conditions through the coming week with further rain expected.
Contributing Factors
6
2.4mm fell overnight/early morning today, following 1.9mm on Aug 16 and 4.2mm on Aug 17, giving no opportunity for the rock to begin drying.
The crag's below-road-level position funnels additional surface water onto the rock face, amplifying the effect of even modest rainfall.
The sheltered aspect means wind speeds at the rock face are substantially lower than the reported 25 km/h, critically slowing evaporative drying.
This crag's rock is noted as more friable and porous than typical Fell Sandstone, meaning water penetrates deeper and the 'scrittle' hazard persists longer after rain.
Seven-day average humidity of 73% with morning readings above 90% today limits evaporative potential even where wind reaches the face.
3.3mm is forecast for Aug 19 and a heavy 16.2mm on Aug 20, meaning no sustained drying window is available in the near term.
Recommendations
3
- Do not climb at Corby's Crag today or in the coming days — the rock is wet from repeated recent rain and further heavy rain is forecast for August 20th.
- Wait for at least 3–4 consecutive dry days with moderate wind after the last rain before considering a visit, and even then check the crag top and base for dampness before committing.
- If conditions eventually improve, prioritise the south-facing sections which will dry first, and avoid top-roping which causes accelerated damage on this soft sandstone.
Do Not Climb
92%
64 days ago
Corby's Crag is currently wet from recent rain (2mm on Aug 16, 4.1mm today) with heavier rain forecast this evening and through the coming days, making conditions entirely unsuitable for climbing. The sheltered, below-road-level position and friable Fell Sandstone mean the crag will need a prolonged dry spell — which is not forecast — before it can safely be climbed.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Corby's below-road-level position channels runoff from the road and hillside above directly onto the rock face, meaning it can be wet even when nearby crags appear dry.
- The rock here is notably more friable and porous than typical Northumberland Fell Sandstone, developing a loose 'scrittle' layer on holds after rain that persists even when the surface looks dry.
- The sheltered setting with minimal wind exposure dramatically slows drying — despite moderate regional winds (15–23 km/h), the crag itself sees far less airflow in its sunken position.
- South-facing sections will dry considerably faster than the NW-facing walls; NW aspects at this sheltered crag can hold moisture for days longer than expected.
Warnings
3
- Climbing on this friable, saturated Fell Sandstone risks permanent hold breakage and irreversible route damage — the 'scrittle' condition will be fully active.
- Heavy rain is forecast tonight (up to 3.5mm after 22:00) — do not attempt late-afternoon climbing thinking conditions might be marginal; they will worsen sharply.
- Road runoff from above may make the crag wetter than general weather conditions suggest — even if surrounding ground looks dry, the face can be actively weeping.
Reasoning
The crag received 2mm on Aug 16 and 4.1mm today (Aug 17), with additional rain from Aug 9 (4.5mm) and Aug 6 (2mm) contributing to a pattern of repeated wetting over the past 11 days — the porous, friable sandstone will be thoroughly saturated internally.
Brief dry windows between showers (e.g. Aug 10–15) were insufficient to fully dry this sheltered, sunken crag given humidity averaging 73% and the below-road-level position that traps moist air and channels runoff from above.
With repeated wetting cycles over the past two weeks and no sustained drying period, the rock is at significant risk of hold breakage and grain loosening — the characteristic 'scrittle' condition noted for this crag will be fully active.
Mid-summer temperatures (16–17°C) are helpful for drying potential, but the persistent unsettled weather pattern with rain every few days negates this advantage entirely.
Contributing Factors
6
4.1mm recorded today with a further 4.1mm of heavy rain forecast this evening (20:00–23:00), ensuring the rock is actively being wetted.
Rain on Aug 9, 16, and 17 means the rock has been re-wetted before completing any drying cycle, keeping internal moisture levels high.
The sunken, sheltered setting dramatically reduces effective wind exposure and channels road runoff onto the face, prolonging wetness well beyond what regional weather data suggests.
Humidity has averaged 73% over the past week and is 85% today, severely limiting evaporative drying in the sheltered position.
Rain is forecast on Aug 18 (0.7mm), 19 (3.5mm), 20 (3.1mm), and 21 (3.9mm), preventing any sustained drying window over the next four days.
Temperatures around 16–17°C provide some drying potential, but this is entirely negated by the repeated rainfall and high humidity.
Recommendations
3
- Do not climb at Corby's Crag today or in the coming days — the rock is wet and the forecast offers no adequate drying window until at least Aug 22.
- If visiting the area, consider non-porous alternatives such as whinstone crags (e.g. Great Wanney or Crag Lough) which are less moisture-sensitive, though still check for slippery surfaces.
- Monitor conditions after Aug 22 — if the dry spell holds and extends, a visit from Aug 24 onwards may become viable, but check the crag top and base for dampness before committing.
Do Not Climb
80%
65 days ago
Today has seen 1.3mm of rain and the forecast shows further rain over the next three days (up to 10.8mm on August 19th), making conditions unsuitable for climbing on this sheltered, moisture-retaining Fell Sandstone crag. Even though the preceding week was relatively dry, today's rain resets the drying clock, and the incoming wet spell means the rock will not get the sustained dry period Corby's Crag requires.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Corby's Crag sits below road level, which channels runoff from the road and surrounding ground onto the rock face — it can be wet even when nearby crags appear dry.
- The rock here is notably more friable and porous than other Northumberland sandstone, and develops 'scrittle' (loose surface grit) after rain that persists even when the surface looks dry.
- The sheltered, low-lying position means wind — the most effective drying agent — has minimal effect, so drying times are significantly longer than for exposed crags.
- South-facing sections will dry faster than the NW-facing sections, but the below-road runoff affects all aspects equally.
Warnings
2
- Climbing on wet or recently-wet Fell Sandstone at Corby's risks permanent hold breakage — the rock is unusually friable and the damage is irreversible.
- Surface 'scrittle' after rain creates a deceptive hazard: the rock may look dry but loose grit on holds dramatically reduces friction and can cause falls.
Reasoning
Today's 1.3mm of rain on already moderately humid rock (following a good dry spell from Aug 10–15) means the surface is currently wet, and the sheltered position will retain this moisture.
Despite a decent dry spell of 6 days prior to today, the sheltered aspect and below-road-level position at Corby's severely limit wind-driven drying, and today's rain plus the incoming 3-day wet spell (totalling ~20mm) will keep the rock saturated for days.
The unusually friable and porous nature of Corby's sandstone means even modest wetting causes significant strength loss and the characteristic 'scrittle' — climbing now risks hold breakage and permanent route damage.
Mid-August temperatures (~16–17°C) support reasonable evaporation rates, but the elevated humidity (80%+) and incoming rain negate this advantage.
Contributing Factors
6
1.3mm fell today with 1.9mm, 4.8mm, and 10.8mm forecast over the next three days, ensuring the rock will remain wet through at least August 20th.
The crag's sheltered, sunken position traps humid air and receives road runoff, dramatically slowing drying compared to exposed crags.
Humidity remains at 77–86% over the coming days, severely limiting evaporative drying even during any rain-free windows.
Six consecutive dry days with moderate temperatures and reasonable wind had allowed some drying, but today's rain has reset this progress.
Mid-August temperatures of 14–19°C are adequate for evaporation, which will help once a sustained dry window eventually arrives.
Corby's sandstone is more porous and friable than typical Fell Sandstone, meaning it absorbs water faster and weakens more severely when wet.
Recommendations
3
- Do not climb today or over the coming days — wait for a sustained dry spell of at least 3–4 days after the last rain (likely not before August 23rd at the earliest).
- Before any visit, check the crag top and base for dampness; if the ground at the base is moist or the top is seeping, the rock is certainly too wet internally.
- When conditions do improve, avoid top-roping on this soft sandstone — lead climbing causes far less rope-induced erosion to the crag edge.
Climbing Outlook