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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Sat 28 Mar 2015

High risk

Gales
Gales likely at all levels throughout.
Persistent extensive hill fog
Widespread through morning, especially west. Gradually lifting and clearing during the afternoon.
Heavy persistent rain
Persistent rain likely through the morning. Waterproof clothing essential.

Medium risk

Storm force winds
Mobility difficult across high ridges during AM. Easing briefly PM, before returning after dusk.

Low risk

Severe chill effect
Feeling cold, especially in strong wind and morning rain. Also in showers later.

No risk

Blizzards
none
Heavy snow
none
Thunderstorms
none
Strong sunlight
none

Sat 28 Mar 2015

A strong westerly flow is expected to bring warm moist air across the park at first. This will bring extensive hill fog, persistent rain and drizzle, and gale to storm force winds. Rain will ease away by midday, with winds easing slightly, however hill fog will be slow to clear. Some brighter spells, and perhaps clear summits possible in the east by late afternoon, before showers spread in. These could include some snow above 1000m, with further hill fog. Winds will also turn very strong again.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Heavy rain Heavy rain Cloudy Sunny intervals Light shower night Light shower night
Precipitation probability
>90% 80% 20% 10% 40% 40%

Visibility

Moderate to poor, often very poor during the morning with extensive hill fog and persistent rain. This clearing to become moderate to good for a time during the afternoon, with the best of the good visibility across eastern summits. Falling to mod to poor in evening showers and very poor again in hill fog.

Hill Fog

Extensive during the morning above 200m, especially western hills. Gradually lifting and clearing to be extensive at 500m by midday, with patches down to 200m in the west. And clearing nearly all summits by mid-afternoon, with isolated patches down to 600m. Further ragged patches down to 400m during evening showers.

Max wind above 500m

Southwesterly 50mph with gusts 80mph, becoming Westerly 35mph with gusts 55mph by mid-afternoon. Increasing to Southwesterly 40mph with gusts 70mph after dark.

Temperature

Valleys:
Plus 7 becoming Plus 13 Celsius.
800m:
Plus 5 becoming Plus 1 Celsius.
Freezing level:
Above the summits.

Ground conditions

Latest: 3/26/2015 20:54:13 Date of observations:3/26 Observation made on:Snowdon Time of observation:12:00:00 PM Winter conditions above:650m Ground Conditions:Isolated stretches of snow, Depth of snow increases with height, Snow drifts in areas Observations on: Snowdon - PyG/Miners Observation Text:After recent snowfall although a major thaw is taking place, snow still covers the upper section of the PyG (the zig zags) up to Bwlch Glas making conditions incredibly slippery underfoot - particularly on decent. For pictures see the Snowdonia National Park Wardens Twitter feed @snowdonweather. Kit Advice:Recommended to carry ice axe and crampons, 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: 0235 on Sat 28 Mar 2015

Sun 29 Mar 2015

Overnight showers will become persistent and heavy during the morning with further hill fog spreading across western parts of the park. Whilst rain will clear by midday, the very strong northwesterly winds will continue throughout, with showers following. Freezing levels will also fall during the day, with showers turning to snow above 700m, and bringing the risk of temporary blizzard conditions at times across the highest summits. It will also feel cold, with significant wind chill.

Visibility

Becoming moderate to poor during the morning, and very poor in hill fog. This clearing through the day, with good visibility, especially across eastern hills. However further showers will bring moderate to poor visibilities at times, turning very poor in any hill fog and perhaps near zero, in blizzards.

Hill Fog

Extensive and widespread at 300m in the west, with ragged patches above 500m in the east. This lifting and break after midday with all summits becoming clear for a time, but further hill fog above 600m developing during heavy showers.

Max wind above 500m

Westerly 40mph with gusts 75mph, easing after dark to 30mph with gusts 55mph.

Temperature

Valleys:
Plus 9 Celsius.
800m:
Plus 1 becoming Minus 1 Celsius
Freezing level:
Above the summits at first, falling to 800m by dusk

Issued at: 0235 on Sat 28 Mar 2015

Mon 30 Mar 2015

Dry, although with isolated showers at first. However conditions will deteriorate through the day, with further strong winds and heavy persistent rain spreading in from the west after midday. Hill fog will also become extensive again. Freezing level initially at 700m, but rising above the summits by midday.

Issued at: 0235 on Sat 28 Mar 2015

Tue 31 Mar 2015

Mondays rain will clear overnight to leave a day of sunny spells and showers. However freezing levels will also fall, with icy paths and rocks likely above 700m. Showers will also fall as snow above 600m at times. It will also remain very windy, with upland gales.

Issued at: 0235 on Sat 28 Mar 2015

Wed 01 Apr 2015

A similar day to Tuesday, with showers easing through the day. Freezing levels will also gradually rise as the winds also ease slightly. However hill fog and outbreaks of rain are likely to spread in from the southwest later in the day.

Issued at: 0235 on Sat 28 Mar 2015