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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Thu 05 Mar 2015

High risk

Gales
Gusts over heighest peaks likely to be 45-55mph throughout the day.
Severe chill effect
Feeling like -10 Celsius in strong winds.
Persistent extensive hill fog
Increasingly extensive across western slopes as low as 500m.

Medium risk

No medium risks
none

Low risk

No low risks
none

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Thunderstorms
none
Heavy persistent rain
none
Strong sunlight
none

Thu 05 Mar 2015

A cloudy day across the range with the cloud becoming increasingly extensive to as low as 500m, mainly across western slopes. The cloud will be thick enough at times to produce some light rain or drizzle, possibly falling as sleet or snow over the highest peaks at first. It will be a windy day with gusts reaching gale force at times. After a chilly start to the day, it will gradually become milder as warmer air arrives from the west.

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

Visibility

Generally good or very good, moderate in light rain, poor in any light sleet/snow at first and very poor in hill fog.

Hill Fog

Bases becoming increasingly extensive at 500m, especially across western coastal slopes where it could be lower at times.

Max wind above 500m

Southwest 30-35mph, gusting 45-55mph.

Temperature

Valleys:
Plus 1 Celsius, increasing plus 10 Celsius.
800m:
0 Celsius becoming plus 4 Celsius.
Freezing level:
900m, quickly becoming above the summits.

Ground conditions

Latest: Date of observations: 3/1 Observation made on: Snowdon Time of observation: 12:30:00 PM Winter conditions above: 600 M Ground Conditions: Isolated stretches of snow, Streams and wet areas are frozen, Depth of snow increases with height, Snow drifts in areas, Major paths obscured making navigation difficult. Observations on: Snowdon (PyG/Miners). Observation Text Upper section of PyG/Miners Track is very hazardous and narrow due to snow drifts. Snow has also collected at Bwlch Glas and a cornice has begun to form. Kit Advice: Ice axe and crampons essential, Wear crampon compatible boots, Walking poles can provide an aid to balance and security when walking through unconsolidated snow, Take waterproofs, hat, gloves and spare warm layers.

Issued at: 0232 on Thu 05 Mar 2015

Fri 06 Mar 2015

A generally cloudy day with some sunny spells possible at times, mainly over the east of the range. The cloud will be thick enough at times to produce some light rain or drizzle. It will be windy once again, with winds gradually increasing so that storm force gusts are likely later.

Visibility

Generally good, moderate in rain, poor in drizzle and very poor in hill fog.

Hill Fog

Extensive cloud at 500m, mainly across western slopes, but falling as low as 200m at times.

Max wind above 500m

Southwest 25-30mph, gusting 55-60mph, increasing 35-40mph, gusting 70-75mph.

Temperature

Valleys:
Plus 5 Celsius, increasing plus 13 Celsius.
800m:
Plus 4 Celsius.
Freezing level:
Above the summits.

Issued at: 0232 on Thu 05 Mar 2015

Sat 07 Mar 2015

A windy, cloudy and mild day across the range. Some sunny spells are possible at times, mainly in the east with further patchy spells of light rain or drizzle likely, mainly across western slopes. Cloud bases as low at 400m at times in the west, bringing extensive hill fog. Winds gusting gale force throughout.

Issued at: 0232 on Thu 05 Mar 2015

Sun 08 Mar 2015

Cloudy with extensive cloud and hill fog, particularly in the west. A more persistant band of rain is likely through the middle of the day, but will ease later. Winds will initially be south-westerly strong to gale force, easing and becoming north-westerly later. Cloud bases as low as 200m at times.

Issued at: 0232 on Thu 05 Mar 2015

Mon 09 Mar 2015

Any remaining cloud and rain will quickly clear to leave a generally dry day with sunny spells. It will feel a little fresher than previous days, although winds will be much lighter. Further cloud and rain are likely later in the day with winds increasing once again.

Issued at: 0232 on Thu 05 Mar 2015