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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Sat 31 Jan 2015

High risk

Storm force winds
Winds strengthening through the day, gusting close to 80 mph over the summits from late afternoon.
Gales
Gale force gusts likely throughout over the summits, and also to slightly lower ground later.
Severe chill effect
Very strong northerly winds will make it feel closer to -16 Celsius at height.
Persistent extensive hill fog
Cloud will blanket the mountains above 600m through much of the morning.

Medium risk

No medium risks
none

Low risk

Blizzards
Snow in the early morning, then again in evening will be blown around by gales giving whiteouts.
Heavy snow
Snow showers on Saturday potential to turn heavy, significantly reducing the visibility.
Thunderstorms
Heavy snow showers have the potential to turn thundery with the risk of lightning strikes.
Strong sunlight
Sunshine in the middle of the day will reflect off snow covered surfaces causing a glare.

No risk

Heavy persistent rain
none

Sat 31 Jan 2015

Some wintry showers at first falling as snow above 100m, this will be blown about by strong northwesterly winds potentially giving whiteout conditions, reducing visibility and making it very disorientating. The showers and cloud will clear in the morning. As the showers clear winds will turn northerly and they begin to increase, continuing to do so through the day with gales across most ranges, and likely severe gales across the most exposed routes from the afternoon. It will be dry and bright through most of the day, but the winds will make it feel closer to -16 Celsius at height. Further wintry showers return later during the evening. These could turn heavy and thundery, and whiteout conditions may well return again.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Cloudy Sunny intervals Sunny intervals Sunny intervals Partly cloudy night Partly cloudy night
Precipitation probability
50% 30% 0% 10% 30% 40%

Visibility

Poor or very poor in snow showers through the early hours, becoming very good or excellent by mid-morning. Visibility dropping to poor or very poor again in further showers through the evening.

Hill Fog

Cloud blankets the mountains above 600m with periods of hill fog above 400m the cloud will slowly break up and lift once the showers have ended leaving only isolated patches above 600m. From evening periods of hill fog to 500m returning with patches down to 300m in any heavy snow showers.

Max wind above 500m

North-westerly 35mph gusts 50mph soon becoming northerly and increasing to 55mph with gusts 80mph.

Temperature

Valleys:
Zero Celsius, rising to plus 3 Celsius, falling to zero Celsius later.
800m:
Minus 6 Celsius.
Freezing level:
Generally around 400 metres.

Ground conditions

Latest: Date of observations: 30th January 2015 Observation made on: Snowdon Time of observation: 4:00 PM Winter conditions above: 500 M Ground Conditions: Light dusting of hail/snow, Streams and wet areas are frozen, Wet surfaces are coated in ice, Depth of snow increases with height, Snow drifts in areas. 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: 0221 on Sat 31 Jan 2015

Sun 01 Feb 2015

Any snow showers easing away before dawn leaving another dry and bright day across the park, but perhaps with and isolated snow shower in the west of the park. Winds will ease slightly, but they will still be strong with gales. Show shower will remain infrequent through the evening, but still possible, again mostly in the west. Remaining cold, with a very cold night to come.

Visibility

Aside from temporarily becoming poor to very poor in wintry showers visibility should generally be very good to excellent.

Hill Fog

Periods to 500m with isolated patches to 300m in any heavy snow showers, but this lifting and breaking in the morning leaving the summits largely free from hill fog. Only occasional patches as low as 300m form temporarily in and around any snow showers.

Max wind above 500m

Northerly 55mph with gusts 80mph, gradually easing to 30mph with gusts 50mph by evening.

Temperature

Valleys:
Zero Celsius rising to plus 4 Celsius, then falling to minus 1 Celsius later.
800m:
Minus 5 Celsius.
Freezing level:
Generally 400m, falling to 200m.

Issued at: 0221 on Sat 31 Jan 2015

Mon 02 Feb 2015

Mostly dry and clear at first, but with cloud increasing and wintry showers becoming more frequent across the park through the day. Strong northerly winds easing. Freezing level around 200m rising to around 500m.

Issued at: 0221 on Sat 31 Jan 2015

Tue 03 Feb 2015

Snow showers at first, but becoming drier as the day progresses and winds easing further. Freezing level 500m becoming freezing at all levels.

Issued at: 0221 on Sat 31 Jan 2015

Wed 04 Feb 2015

Very cold and largely dry through the day. Rather cloudy at times, and the thicker cloud may bring outbreaks of rain to the park. Freezing at all levels with the freezing level rising to 400m.

Issued at: 0221 on Sat 31 Jan 2015