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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Fri 24 Feb 2017

High risk

No high risks
none

Medium risk

Severe chill effect
Despite fine conditions, remaining cold at height with brisk winds.

Low risk

Blizzards
Snow likely across highest summits for a time in the evening. Near zero visibility for a time.
Gales
Winds strengthening after dark, leading to a low risk of gales across summits.
Persistent extensive hill fog
Cloud thickening into the evening and descending on slopes.
Heavy persistent rain
Rain becoming persistent and heavy during the evening.

No risk

Heavy snow
none
Storm force winds
none
Thunderstorms
none
Strong sunlight
none

Fri 24 Feb 2017

A cold start with frozen ground at height. A sunny day follows, with generally fine conditions across Snowdonia, but a noticeable wind chill with brisk northwesterly winds. Perhaps the odd wintry shower at first. However cloud will thicken into the evening, with some hill fog developing across the tops. Rain will then spread in from the west, initially falling as snow above 800m, but soon turning back to rain at all levels.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Sunny intervals Sunny intervals Sunny intervals Cloudy Sleet Heavy rain
Precipitation probability
10% 10% 0% 20% 80% 100%

Visibility

Very good to excellent during the day. Decreasing to moderate into the evening, and poor in any overnight heavy rain or drizzle and very poor in hill fog. Perhaps near zero in any temporary blizzard conditions.

Hill Fog

Well broken above 700 metres becoming broken to overcast at 600 metres during the evening.

Max wind above 500m

Northwesterly 20-25mph gusting 30-35mph, becoming southwesterly 40mph with gusts 45-55mph after dusk.

Temperature

Valleys:
Minus 1 Celsius becoming plus 8 Celsius
800m:
Minus 2 becoming plus 2 Celsius
Freezing level:
400m rising to 800m by dusk, and above the summits by midnight.

Ground conditions

Area - Snowdon Date - 19 February 2017 Time - 12.30pm Snow Above - 950metres Report By - JonElliott Route Taken Penypass to Lliwedd. Watkin to Snowdon.Descend Miners track. Conditions: Isolated patches of snow. No adverse ground conditions observed by the National Park Wardens. Thawing at all levels. Paths clear. Kit Advice: The following is a list of additional kit required based on the current conditions. Wear sturdy walking boots. Take waterproofs, hat, gloves and spare warm layers.

This report is completed on a regular basis through the winter months by Snowdonia National Park Wardens and gives indicative information on snow/ice conditions underfoot in the Snowdonia area as a whole. Remember mountains can be inhospitable and dangerous places for the ill-prepared so it is important to check the forecast before setting out.

Further information:
Live information on Winter Conditions in Cwm Idwal: https://www.thebmc.co.uk/idwal
Forum discussions on the latest Winter Conditions: http://www.ukhillwalking.com/forums/i.php?f=7
The Met Office is not responsible for the content of external sites.

Sat 25 Feb 2017

Wet with persistent hill fog, rain and drizzle through much of the day. Hill fog is likely to shroud western hills to lower levels, where rain is likely to turn heavy at times. There will also be very strong southwesterly winds, so despite the milder temperatures there is likely to be a cold feel. Some clearer spells could move into the area after dark.

Visibility

Moderate to poor in heavy rain with extensive hill fog. Becoming good during the evening.

Hill Fog

Overcast above 600 metres with broken patches down to 400 metres especially in the west.

Max wind above 500m

Southwesterly 40-55mph with gusts around 70mph. These easing during the evening to westerly 20mph with gusts 30-35mph.

Temperature

Valleys:
Plus 6 becoming 10 Celsius
800m:
Plus 2 Celsius
Freezing level:
Above summits.

Sun 26 Feb 2017

Overnight rain will clear, with freezing levels falling briefly, perhaps leading to some icy patches at first across the tops. Another windy day then follows with southwesterly winds strengthening as a band of heavy rain crosses the area through the afternoon. The freezing levels remaining just above the highest summits, before falling again after dark.

Mon 27 Feb 2017

A cloudy day with scattered heavy showers, falling as snow above 500m. These could align into more persistent bands, leading to some significant accumulations in places. Between showers, some fine conditions are likely, but there will also be the risk of rapid deteriorations as further showers move through. The freezing level will be around 600m, whilst strong winds will lead to an additional hazard.

Tue 28 Feb 2017

Winds will ease overnight with showers fading for a time. A day of sunny spells will then follow, with brisk northerly winds developing. However further showers are then likely through the afternoon, falling as snow above 700m. Freezing levels will gradually rise to around 800m,

Issued at: 0343 on Fri 24 Feb 2017