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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Tue 27 Jan 2015

High risk

Severe chill effect
Feeling closer to -10C at higher elevations in exposure to the wind.
Persistent extensive hill fog
Hills will be widely shrouded in the cloud throughout the day, highest bases across eastern hills.

Medium risk

No medium risks
none

Low risk

Gales
Increasing winds through the evening with gusts by then up to 55mph.

No risk

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

Tue 27 Jan 2015

A dull and damp day with cloud widely shrouding the hills and producing some outbreaks of rain or drizzle, falling as snow grains above 700m. Feeling cold with a significant wind chill and terrain remaining frozen above 700m. Through the evening, the drizzly rain will become more prevalent with the freezing level lifting above the summits. Moderate to strong westerly winds will lead to a significant wind chill, especially later in the evening when upland gales develop.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Cloudy Light rain Light rain Light rain Drizzle Drizzle
Precipitation probability
40% 40% 50% 50% 70% 80%

Visibility

Generally good at first, but deteriorating to moderate through the morning, and poor in the rain, drizzle and very poor in the cloud and snow grains.

Hill Fog

Cloud will thicken and lower through the morning, giving extensive hill fog above 500-700m, highest bases in the east, with patches in the west down to 300m. Hills will then remain widely foggy throughout the day with bases lowering to 300-500m by evening with patches down to 100m.

Max wind above 500m

Westerly 20-30mph with gusts 40mph. Becoming southwesterly 35-45mph through the evening with gusts 55mph.

Temperature

Valleys:
Plus 4 or 5 Celsius becoming 6 to 8 Celsius through the afternoon.
800m:
Minus 1 or 2 Celsius becoming Plus 3 Celsius through the evening.
Freezing level:
700-800m, rising above the summits through the evening.

Ground conditions

Latest: Date of observations:1/25 Observation made on:Snowdon Time of observation: 3:00:00 PM Winter conditions above:750M Ground Conditions: Isolated stretches of snow, Thawing snow has refrozen, Slopes and paths covered in hard snow and ice Observations on:PyG/Miners Observation Text: Although a major thaw is taking place and conditions are changing rapidly, frozen snow/ice remains on the path above the intersection of the PyG and Miners. Kit Advice:Ice axe and crampons recommended, 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: 0423 on Tue 27 Jan 2015

Wed 28 Jan 2015

A murky night with rain and drizzle which will become persistent towards dawn, with some heavy rain likely. This rain will then be displaced through the morning by much colder, brighter and showery conditions. Hail and snow showers will be driven in from the Irish Sea by the gale force, severe at higher elevations, northwesterly winds leading to blizzard conditions with whiteout and the risk of lightning. Severe wind chill with temperatures feeling more like -15 to -17C across the summits.

Visibility

Moderate to poor overnight, but as the band of rain clears after dawn, visibilities will improve to very good. Thereafter, the visibility will oscillate through the day from very good between the showers, to near zero or whiteout as the snow showers envelop the park.

Hill Fog

Extensive cloud shrouding the hills overnight with bases down to 300-500m with patches as low as 100m in the west. Cloud bases will lift and break up through the morning as clearer, colder air filters down from the north. Thereafter, cloud bases will rapidly fluctuate through the day bringing periods of hill fog above 600m, with patches down to 300m in the snow showers. However, there will be some occasional clearances to summit level, especially in the south.

Max wind above 500m

Southwesterly 45mph with gusts 55mph overnight, perhaps gusting to 65mph across the Snowdon Massif. Veering westerly 45-55mph gusts 60-70mph.

Temperature

Valleys:
8 to 10 Celsius overnight, falling sharply to 2 to 4 Celsius through the morning.
800m:
Plus 3 becoming Minus 4 Celsius by afternoon.
Freezing level:
Freezing level above the summits overnight, but lowering to around 400m by afternoon, but temporarily lowering during snow showers.

Issued at: 0423 on Tue 27 Jan 2015

Thu 29 Jan 2015

Another very cold day with northwesterly gales feeding further hail and snow showers across the park, bringing the risk lightning. The showers will be most frequent across northern hills where they will merge into bands of more prolonged snow at times leading to blizzard conditions, whiteout and thus hazardous conditions on the hills. The best of the brighter breaks will be across southern hills. Freezing level 400m, but temporarily lowering during snow showers.

Issued at: 0423 on Tue 27 Jan 2015

Fri 30 Jan 2015

Remaining cold with snow showers pushing in from the Irish Sea, hail and sleet lower slopes, bringing the risk of lightning. Between the showers, there will be some brief spells of bright sunshine leading to extensive glare of the snow pack. Significant wind chill. Freezing level 500m.

Issued at: 0423 on Tue 27 Jan 2015

Sat 31 Jan 2015

North to northwestelry winds will bring further hail and snow showers in from the Irish Sea interspersed by some bright or sunny spells. Temporary whiteout and blizzard conditions with snow drifting in the gale force winds. Severe wind chill. Freezing level 300-400m.

Issued at: 0423 on Tue 27 Jan 2015