Is it safe to climb Cribyn today and tomorrow?

Today on Cribyn is rated Poor and tomorrow Marginal, from the summit forecast. Summit forecast updated 09:11, 28 Oct. The reasons are below, followed by what the rating can't tell you.

Is it safe to climb Cribyn today?

Poor Today Wednesday 28 October

• Wind and gusts: Summit wind up to 40 mph, gusting 50 mph. That is past the Poor line (wind 40 mph or gusts 65 mph), when walking on exposed ground is hard and a fall more likely.
• Rain: 75% chance of rain, about 6.5 mm in all. A 60% chance or more makes the day Marginal on its own: wet rock is slippery and wet kit chills you faster.
• Cloud: Cloud cover averages 97% and humidity 96% at summit height. Air that close to saturation means the top is likely to be in cloud, so plan to navigate by map and compass. The forecast gives no cloud base height; the main peak page estimates one from the valley forecast.
• Temperature and wind chill: Up to 9°C at the summit, down to 5°C, feeling as cold as 0°C in the wind.
• Daylight: Sunrise 07:01, sunset 16:53: 9h 52m of daylight.

Is it safe to climb Cribyn tomorrow?

Marginal Tomorrow Thursday 29 October

• Wind and gusts: Summit wind up to 36 mph, gusting 45 mph. That is past the Marginal line (wind 25 mph or gusts 45 mph): expect to be pushed about on ridges and the summit.
• Rain: 0% chance of rain, about 0.1 mm in all.
• Cloud: Cloud cover averages 78% and humidity 94% at summit height. The forecast gives no cloud base height; the main peak page estimates one from the valley forecast.
• Temperature and wind chill: Up to 8°C at the summit, down to 6°C, feeling as cold as 2°C in the wind.
• Daylight: Sunrise 07:02, sunset 16:51: 9h 49m of daylight.

Is it safe to climb Cribyn this weekend?

Good Saturday 31 October

• Wind and gusts: Summit wind up to 13 mph, gusting 16 mph. That is under the Marginal line of 25 mph wind or 45 mph gusts.
• Rain: 0% chance of rain, about 0 mm in all.
• Cloud: Cloud cover averages 99% and humidity 99% at summit height. Air that close to saturation means the top is likely to be in cloud, so plan to navigate by map and compass. The forecast gives no cloud base height; the main peak page estimates one from the valley forecast.
• Temperature and wind chill: Up to 6°C at the summit, down to 1°C, feeling as cold as -1°C in the wind.
• Daylight: Sunrise 07:06, sunset 16:48: 9h 41m of daylight.

Marginal Sunday 1 November

• Wind and gusts: Summit wind up to 25 mph, gusting 31 mph. That is under the Marginal line of 25 mph wind or 45 mph gusts.
• Rain: 0% chance of rain, about 0.5 mm in all.
• Cloud: Cloud cover averages 98% and humidity 98% at summit height. Air that close to saturation means the top is likely to be in cloud, so plan to navigate by map and compass. The forecast gives no cloud base height; the main peak page estimates one from the valley forecast.
• Temperature and wind chill: Up to 5°C at the summit, down to 1°C, feeling as cold as -1°C in the wind.
• Daylight: Sunrise 07:08, sunset 16:46: 9h 38m of daylight.

Weekend forecasts firm up during the week; check again the day before.

What the verdict covers, and what it doesn't

Peakify rates each day Good, Marginal or Poor from the forecast summit wind, gusts, chance of rain and wind chill. Wind of 40 mph or gusts of 65 mph make it Poor; wind of 25 mph, gusts of 45 mph, a 60% chance of rain or a feels-like temperature of -8°C or below make it Marginal. That is all it measures: the weather forecast at the summit.

It does not know your fitness or experience, whether you can navigate in cloud with a map and compass, or what you are carrying. It does not see the state of the path, river levels, snow and ice already on the ground, or how the forecast is changing during the day. A Good day can still go wrong if you start late, turn an ankle or lose the path in mist, and a Marginal day can be fine for an experienced party on the easiest route.

On any day, carry waterproofs, warm layers, a hat and gloves, food, water, a head torch and a charged phone, and know how you would navigate if the top is in cloud. Tell someone your route and when you expect to be down. In winter conditions you need an ice axe and crampons and the skill to use them, or a guide.

In an emergency

Call 999, ask for the police and then mountain rescue. Mountain rescue teams in the UK are volunteers called out through the police. Give your location (a grid reference from a map or phone app if you can), what has happened, how many are in your group and your phone number, then keep the phone free. If you have no signal, try to move to higher ground or text 999; you need to have registered your phone with the emergencySMS service before for a text to work.

Questions about Cribyn

Is it safe to climb Cribyn today?

Today, Wednesday 28 October: dense drizzle, up to 9°C at the summit, feeling as cold as 0°C, summit wind 40 mph gusting 50 mph, 75% chance of rain. Rated Poor. The rating covers the summit weather only; your route, kit and experience matter as much.

Is it safe to climb Cribyn tomorrow?

Tomorrow, Thursday 29 October: mostly dry, up to 8°C at the summit, feeling as cold as 2°C, summit wind 36 mph gusting 45 mph, 0% chance of rain. Rated Marginal.

How does Peakify decide whether Cribyn is safe to climb?

Peakify rates each day Good, Marginal or Poor from the forecast summit wind, gusts, chance of rain and wind chill. Wind of 40 mph or gusts of 65 mph make it Poor; wind of 25 mph, gusts of 45 mph, a 60% chance of rain or a feels-like temperature of -8°C or below make it Marginal. It does not judge your fitness, kit, navigation or the state of the path.

Who do I call in an emergency on Cribyn?

Call 999, ask for the police and then mountain rescue. Give your location (a grid reference if you can), what happened and how many are in your group. Stay with the casualty and keep them warm.