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amber Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Sun 26 Oct 2014

High risk

Gales
Gusts reach gale force across many routes through the day, expect buffeting in exposure.
Severe chill effect
Gusty winds over higher routes will make it feel closer to -2 Celsius.
Persistent extensive hill fog
Visibility will become very poor giving navigational difficulties as low down the mountain as 400m.

Medium risk

Storm force winds
Gusts reach 75mph over higher routes through the day, with a danger of losing footing in exposure.

Low risk

No low risks
none

No risk

Blizzards
none
Heavy snow
none
Thunderstorms
none
Heavy persistent rain
none
Strong sunlight
none

Sun 26 Oct 2014

Strong southwesterly winds, with gusts to gale force across many routes, and as strong as storm force over the highest most exposed routes. This will make it feel much colder with temperatures feeling closer to -2 Celsius over the highest summits. It will be fairly cloudy with some hill fog through the morning, and there will also be the odd spot of light rain or drizzle. The rain will mostly fall on western facing slopes. Skies do brighten up for a time around the middle of the day, but this will be fairly short lived as low cloud returns from the southwest, extending across the park. There may also be some further light rain. It will turn dry overnight but the low cloud will persist.

Time
0000 to 0300 0300 to 0600 0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Light rain Light rain Light rain Cloudy Sunny intervals Sunny intervals Cloudy Cloudy
Precipitation probability
70% 70% 70% 40% 0% 40% 40% 0%

Visibility

Generally very good or excellent on routes where there is no hill fog, although mountain tops will not be visible where they are covered in cloud. The visibility will reduced to moderate or poor in any light rain or drizzle. Deteriorating slightly to good visibility towards the end of the day.

Hill Fog

Periods down to 700m with occasional down to 400m until around midday, then temporarily only occasional to 700m . From mid-afternoon becoming persistent down to 600m with periods down to 400m as cloud extends across the park from the southwest.

Max wind above 500m

Southwesterly 45-50mph gusting 75mph.

Temperature

Valleys:
Around plus 13 Celsius.
800m:
Around plus 5 Celsius.
Freezing level:
Above the summits.

Ground conditions

Latest: 25/10/2014 15:53 No adverse ground conditions observed by National Park Wardens.

Issued at: 1738 on Sat 25 Oct 2014

Mon 27 Oct 2014

Cloudy throughout the day. There will likely be some light rain over western facing hills, with those facing east likely to remain dry. Winds will remain strong throughout, with gales continuing across many routes. There is also a continued risk for storm force gusts across the higher more exposed routes through the morning. Temperatures becoming milder across higher routes, but as winds are so strong there will still be a chill effect.

Visibility

Generally good throughout, perhaps improving to very good for a time during the afternoon. Deteriorating to moderate or poor in any light rain and drizzle.

Hill Fog

Periods down to 400m, with isolated patches as low as 200m. Cloud will persistently stay below 600m though the day.

Max wind above 500m

South-southwest 45mph gusts 70-75mph.

Temperature

Valleys:
Around plus 13 Celsius.
800m:
Plus 7 Celsius, rising to plus 11 Celsius by the end of the day.
Freezing level:
Above the summits.

Issued at: 1738 on Sat 25 Oct 2014

Tue 28 Oct 2014

Cloud thickens and lowers with a band of rain moving south across the park during the morning. As the rain arrives the winds will start to ease. Drier and clearer conditions follow behind from later on in the afternoon and it will become colder too. Freezing level generally above the summits, but falling to just above the summits later in the day.

Issued at: 1738 on Sat 25 Oct 2014

Wed 29 Oct 2014

Mainly dry throughout Wednesday with largely clear skies allowing for some bright sunny spells. Feeling colder too. Becoming cloudy again from the southwest much later in the evening. Freezing level just above the summits, but falling to 800m.

Issued at: 1738 on Sat 25 Oct 2014

Thu 30 Oct 2014

Cloud continues to build from the southwest with outbreaks of rain moving across the area from Thursday morning. The rain will likely become heavier and more persistent through the afternoon. Perhaps turning drier again later in the day. Freezing level initially at 800m but soon above the summits again.

Issued at: 1738 on Sat 25 Oct 2014