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Snowdonia

Weather hazards over 1000ft

High risk

No high risks
none

Medium risk

Strong sunlight
Long sunny spells throughout the day.

Low risk

Persistent extensive hill fog
Some patchy cloud at 500m, burning off through the morning.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Severe chill effect
none
Thunderstorms
none
Heavy persistent rain
none

Fri 18 Apr 2014

A cold start with frost and some patchy valley mist. It will then be a dry day with long spells of warm sunshine and light winds. Some patchy low cloud for a time through the morning, clearing by lunch time. It will feel pleasantly warm when walking.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Sunny intervals Sunny day Sunny day Sunny day Clear night Clear night
Precipitation probability
0% 0% 0% 0% 0% 0%

Visibility

Excellent or very good, very poor in any hill fog.

Hill Fog

Patchy cloud from 500m at first. Lifting and clearing through the morning.

Max wind above 500m

Northerly 15-20mph at first.

Temperature

Valleys:
Plus 2 Celsius becoming plus 13 Celsius.
800m:
Plus 0 Celsius becoming plus 4 Celsius.
Freezing level:
900m soon rising above summits.

Ground conditions

Latest: 07/04/2014 14:24 Yr Wyddfa/Snowdon: Some small patches of snow above 900m.

Issued at: 0423 on Fri 18 Apr 2014

Sat 19 Apr 2014

A cold start after clear skies overnight. Another dry day with plenty of warm sunshine throughout, through becoming slightly hazy later. Winds remaining mainly light and easterly resulting in some patchy cloud at first. Conditions will be pleasantly warm while walking and care should be taken in the sunshine.

Visibility

Excellent, reducing moderate to good in haze later. Very poor in any hill fog.

Hill Fog

Patchy cloud at 500m at first, soon clearing.

Max wind above 500m

Easterly 15mph, gusting 25mph at times.

Temperature

Valleys:
Plus 1 Celsius becoming plus 14 Celsius.
800m:
Plus 4 Celsius.
Freezing level:
Above summits.

Issued at: 0423 on Fri 18 Apr 2014

Sun 20 Apr 2014

A fine a dry start with cloud soon increasing, bringing hill fog and rain through the afternoon. Winds also strengthening from the northeast. It will be noticeably colder that previous days. Freezing level close to the summits at first.

Issued at: 0423 on Fri 18 Apr 2014

Mon 21 Apr 2014

A dull, cloudy day with rain at times throughout. There will be some brighter spells at times too, but hill fog will be extensive above 500m. Winds remaining fresh to strong from the northeast, making walking difficult at times and also keeping temperatures down. Care should be taken.

Issued at: 0423 on Fri 18 Apr 2014

Tue 22 Apr 2014

Drier and less windy than on Monday. Still a generally cloudy day with extensive hill fog for the highest peaks and spells of rain or drizzle throughout the day. However, there may be a few more brighter spells.

Issued at: 0423 on Fri 18 Apr 2014