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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Mon 02 Feb 2015

High risk

No high risks
none

Medium risk

Severe chill effect
In snow showers and strong winds. Feeling as low as -15 Celsius.

Low risk

Blizzards
In any strong gusts associated with snow showers.
Strong sunlight
Sunlight reflecting off the snow pack will produce a glare.

No risk

Heavy snow
none
Storm force winds
none
Gales
none
Persistent extensive hill fog
none
Thunderstorms
none
Heavy persistent rain
none

Mon 02 Feb 2015

A very cold start with a widespread, locally severe, frost and isolated icy patches. It will be a mainly dry day, but there will be isolated snow showers throughout, mainly across western slopes. With brisk northerly winds and strong gusts there is the potential for whiteout conditions in showers and a significant wind chill (feeling like -15 Celsius). Cloud will increase into the evening with a more persistent band of rain, sleet or snow likely later.

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
Partly cloudy night Partly cloudy night Sunny intervals Sunny intervals Sunny intervals Sunny intervals Partly cloudy night Cloudy
Precipitation probability
10% 20% 20% 10% 10% 10% 10% 20%

Visibility

Very good or excellent, but temporarily falling to poor or very poor in snow showers.

Hill Fog

Isolated patches as low as 700m in showers.

Max wind above 500m

North to northwesterly 20-25mph, gusting 30-35mph.

Temperature

Valleys:
Minus 3 Celsius, increasing plus 4, falling to minus 4 Celsius later.
800m:
Minus 5 Celsius.
Freezing level:
Freezing at all levels, but temporarily rising to 200m during the day.

Ground conditions

Latest: Date of observations: 1st February 2015 Observation made on: Snowdon Time of observation: 1:00 Pm Winter conditions above: 450m Ground Conditions: Streams and wet areas are frozen, Thawing snow has refrozen, Heavy frost covers rocks and vegetation, Depth of snow increases with height, Snow drifts in areas, Paths difficult to follow, Cornices (unstable overhanging snow) forming on cliff edges, Major paths obscured making navigation difficult. Observations on: Pyg Track Observation Text: Consistently strong winds have caused heavy snow drifts, particularly on the Zigzags (900m up the Pyg track), making the path incredibly narrow, slippery and dangerous. Cornices are also forming around Bwlch Glas (1000m) due to high winds. Cadair Idris: Snow down to 450m, with winds causing snow to accumulate up to knee height in some areas. Cornices forming on cliff edges. Exposed areas of path have been scoured of snow and are covered in a thick layer of ice, making them extremely slippery. 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, Ski goggles can aid visibility in strong winds and blowing snow, Take waterproofs, hat, gloves and spare warm layers.

Issued at: 2152 on Sun 01 Feb 2015

Tue 03 Feb 2015

A cold and generally dry start with isolated wintry showers. A band of patchy and weakening rain, sleet or snow will moves southeast across the range through the afternoon, bringing temporary whiteout conditions. Further wintry showers will follow, again bringing snow to the highest peaks.

Visibility

Generally good or excellent, moderate in rain, very poor in snow and hill fog.

Hill Fog

Broken amounts as low as 600m in snow.

Max wind above 500m

Generally northerly 10-15mph, becoming northeasterly 20-25mph gusting 30-35mph later.

Temperature

Valleys:
Minus 4 Celsius, increasing plus 2 Celsius, falling to minus 5 Celsius later.
800m:
Minus 5 Celsius.
Freezing level:
Freezing at all levels, rising to 100-200m later.

Issued at: 2152 on Sun 01 Feb 2015

Wed 04 Feb 2015

Generally cold and dry with some sunny spells. The odd wintry shower is possible, near the coast. Winds will be light and there will be widespread frosts overnight.

Issued at: 2152 on Sun 01 Feb 2015

Thu 05 Feb 2015

Another cold and generally dry day with isolated wintry showers. Winds remaining light with overnight frosts.

Issued at: 2152 on Sun 01 Feb 2015

Fri 06 Feb 2015

Cold and dry once again with extensive, locally severe frosts. The risk of isolated wintry showers remains.

Issued at: 2152 on Sun 01 Feb 2015