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Yellow Warning Weather warnings issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Wed 23 Jul 2014

High risk

Strong sunlight
Long sunny spells and high UV levels bring a risk of sunburn.

Medium risk

No medium risks
none

Low risk

Persistent extensive hill fog
Occasional around 300m, mainly over eastern slopes at first.
Thunderstorms
Risk of heavy and perhaps thundery showers towards evening, mainly in the south.

No risk

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

Wed 23 Jul 2014

Low cloud will soon lift and clear during the morning to leave plenty of sunny spells and becoming very warm or locally hot, with a high risk of sunburn. Cloud bubbling up in the afternoon, with a risk of heavy and perhaps thundery showers towards evening, mainly across southern parts of the park. Any showers will fade during the evening to leave a dry start to the night.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Partly cloudy night
Precipitation probability
0% 0% 0% 10% 30% 20%

Visibility

Generally very good, but very poor in early hill fog and also becoming moderate or poor in any heavy showers.

Hill Fog

Occasional around 300m around dawn, mainly over eastern slopes, but this soon clearing to leave summits cloud free.

Max wind above 500m

Easterly 35mph.

Temperature

Valleys:
Plus 14, rising to plus 26 Celsius.
800m:
Plus 15 Celsius.
Freezing level:
Well above the summits.

Issued at: 0350 on Wed 23 Jul 2014

Thu 24 Jul 2014

Dry overnight with long clear spells but also some patchy low cloud, this more likely towards dawn and in the east. Another bright and very warm day will follow with long sunny spells once any patchy low cloud clears. Many places will remain dry, but showers are likely to develop with some heavy and perhaps thundery downpours possible.

Visibility

Generally very good, but poor or very poor in any hill fog. Moderate or poor in any heavy showers.

Hill Fog

Occasional patches around 400m, these soon burning off to leave summits clear of cloud.

Max wind above 500m

Southeasterly 35mph.

Temperature

Valleys:
Plus 14, rising to plus 27 Celsius.
800m:
Plus 17 Celsius.
Freezing level:
Well above the summits.

Issued at: 0350 on Wed 23 Jul 2014

Fri 25 Jul 2014

A few mist and hill fog patches initially, then a bright morning with sunny spells. There is a risk of scattered showers developing by afternoon once again, some of these may turn heavy and become slow-moving with just a light easterly breeze. It will feel very warm on the slopes, with high UV levels bringing a high risk of sunburn.

Issued at: 0350 on Wed 23 Jul 2014

Sat 26 Jul 2014

Any early mist and fog patches soon lifting to allow good sunny spells and a few showers. The showers should be lighter than recently. Winds will be light northeasterly making it feel a little cooler than past days, but still warm.

Issued at: 0350 on Wed 23 Jul 2014

Sun 27 Jul 2014

There is likely to be more cloud than of late, but still with a good deal of dry weather and sunny spells. From late morning some showers are possible, perhaps the odd heavy one. Light to moderate northeasterly winds.

Issued at: 0350 on Wed 23 Jul 2014