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Yellow Warning Weather warnings issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Fri 01 Aug 2014

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Extensive at 500m at first, becoming patchy, but as low as 300m at times.
Heavy persistent rain
Showery rain throughout, possibly reaching totals of 40mm in 24 hours.

Low risk

Thunderstorms
Low risk of an isolated thrundery downpour.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Severe chill effect
none
Strong sunlight
none

Fri 01 Aug 2014

A cloudy start with showery rain. The rain will become more persistent throughout the day ,particularly on western slopes. Rain will be heavy at times with a risk of thunder. Cloud bases will be at 500m at first, lifting and breaking at times through the day, but may drop as low as 300m in heavy rain or thunderstorms. Winds will be fresh southwesterly.

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
Cloudy Light shower day Light shower day Light shower day Heavy shower day Heavy shower day Heavy shower day Heavy shower day
Precipitation probability
20% 40% 60% 70% 60% 70% 80% 80%

Visibility

Good, but moderate in rain, poor in heavy rain and mist, very poor in hill fog.

Hill Fog

Extensive above 500m at first, becoming patchy, possibly as low as 300m at times.

Max wind above 500m

Southwest 15-20mph.

Temperature

Valleys:
Plus 12 Celsius increasing plus 18 Celsius.
800m:
Plus 10 Celsius.
Freezing level:
Above the summits.

Issued at: 1437 on Thu 31 Jul 2014

Sat 02 Aug 2014

Rain, heavy at times, will gradually move northeast to be followed by scattered showers. The showers becoming less frequent throughout the day. Cloud bases will be as low as 500m at times throughout the day, particularly over southern slopes. Winds generally northwesterly moderate.

Visibility

Good, but moderate in rain, poor in heavy rain and mist, very poor in hill fog.

Hill Fog

Patchy at 500m throughout the day.

Max wind above 500m

Southwest becoming northwest 12-17mph.

Temperature

Valleys:
Plus 12 Celsius increasing plus 17 Celsius.
800m:
Plus 9 Celsius.
Freezing level:
Above the summits.

Issued at: 1437 on Thu 31 Jul 2014

Sun 03 Aug 2014

Some showery rain possible at first, then clearing to leave a mainly dry day with sunny spells and isolated showers. Breezy, particularly at height, easing later.

Issued at: 1437 on Thu 31 Jul 2014

Mon 04 Aug 2014

A generally dry and bright day with some sunny spells. Winds lighter than Sunday. Increasingly cloudy from the west later with some showery rain possible.

Issued at: 1437 on Thu 31 Jul 2014

Tue 05 Aug 2014

Mainly dry at first with some bright or sunny spells. Cloud increasing later with some showers or rain possible.

Issued at: 1437 on Thu 31 Jul 2014