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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Sat 20 Sep 2014

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Extensive above 200m leading to difficult navigation at first. Clearing during the afternoon.

Low risk

Strong sunlight
Low risk of sunburn during sunny spells.

No risk

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

Sat 20 Sep 2014

It will be mostly dry but fairly cloudy day with hill fog. Outbreaks of drizzle are possible during the morning, with the hill fog slow to clear, especially from northern slopes. Brighter spells will develop during the afternoon, however showery outbreaks will see hill fog returning above 500m. Some sunny spells are possible by the evening.

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

Visibility

Poor at first, but very poor in hill fog. Increasing to good during the afternoon, and perhaps very good by the evening.

Hill Fog

Extensive at 200m during the morning but lifting and breaking later. Returning above 500m during afternoon mainly across northern hills and during showers.

Max wind above 500m

North to northeasterly 25 mph.

Temperature

Valleys:
Plus 13 rising to 18 Celsius.
800m:
Plus 10 Celsius.
Freezing level:
Above the summits.

Issued at: 0421 on Sat 20 Sep 2014

Sun 21 Sep 2014

It should become dry through the early hours with patches of cloud during the early hours, clearing by dawn to give a sunny morning. A little cloud may fill in during the afternoon. Winds will be light and visibility will be much improved.

Visibility

Very good or excellent.

Hill Fog

Occasional patches above 600m.

Max wind above 500m

Northeasterly 25 mph.

Temperature

Valleys:
Plus 10 rising to 17 Celsius.
800m:
Plus 7 Celsius.
Freezing level:
Above the summits.

Issued at: 0421 on Sat 20 Sep 2014

Mon 22 Sep 2014

A chilly start to the day but dry throughout with light winds and occasional patches of hill fog towards the higher peaks. It will feel cooler than of late but visibility should remain very good.

Issued at: 0421 on Sat 20 Sep 2014

Tue 23 Sep 2014

Dry first ting but soon turning cloudier from the northwest with outbreaks of light rain possible by the afternoon. Winds will be light and southwesterly.

Issued at: 0421 on Sat 20 Sep 2014

Wed 24 Sep 2014

Any rain soon clearing to the southeast leaving a dry day with variable amounts of cloud. Some bright spells are possible but winds will strengthen from the west.

Issued at: 0421 on Sat 20 Sep 2014