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Snowdonia

Weather hazards over 300m on Mon 22 Sep 2014

High risk

No high risks
none

Medium risk

Strong sunlight
Moderate risk of sunburn.

Low risk

Persistent extensive hill fog
Occasional patches around 600 metres.

No risk

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

Mon 22 Sep 2014

A cold start this morning, with a few mist and fog patches, mainly in prone valleys. However, staying dry and bright across the Park, with sunny spells. Some patchy cloud is likely in the afternoon, especially in the east of the park. Sunshine will give a moderate risk of sunburn.

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

Visibility

Very good or excellent, perhaps poor or very poor in any mist or fog.

Hill Fog

Occasional patches around 600 metres as cloud develops from the east.

Max wind above 500m

Westerly 25 mph.

Temperature

Valleys:
Plus 2 rising to 17 Celsius.
800m:
Plus 8 Celsius.
Freezing level:
Above the summits.

Issued at: 0243 on Mon 22 Sep 2014

Tue 23 Sep 2014

Dry through the early hours with cloud amounts increasing by dawn. A few bright spells are possible in the morning but outbreaks of rain are expected from around midday, easing during the evening.

Visibility

Moderate or good, but very poor in hill fog. Moderate or poor in rain.

Hill Fog

Periods above around 400m for most of the day.

Max wind above 500m

Southwesterly 35 mph.

Temperature

Valleys:
Plus 8 rising to 16 Celsius.
800m:
Plus 8 Celsius.
Freezing level:
Above the summits.

Issued at: 0243 on Mon 22 Sep 2014

Wed 24 Sep 2014

Rather cloudy at first, with outbreaks of rain. However, drier and brighter weather will spread from the northwest during the afternoon, with most of the Park set to enjoy some sunshine. Fresh to strong northwesterly winds over the peaks.

Issued at: 0243 on Mon 22 Sep 2014

Thu 25 Sep 2014

Rather cloudy throughout the day, with the best of any bright or sunny intervals to the lee of high ground in the east of the Park. Brisk westerly winds and patchy hill fog on west facing slopes. Dry through much of the day, but there will be a risk of a little drizzle late afternoon and evening.

Issued at: 0243 on Mon 22 Sep 2014

Fri 26 Sep 2014

Another cloudy day with patchy drizzle possible, along with fairly extensive hill fog, especially on west-facing slopes. Perhaps some more persistent rain later in the day. Strong southwesterly winds.

Issued at: 0243 on Mon 22 Sep 2014