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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Fri 19 Dec 2014

High risk

Gales
Strong winds over several routes will cause considerable buffeting making walking difficult.
Severe chill effect
Low temperatures combined with strong winds make it feel much colder despite the drier conditions.

Medium risk

No medium risks
none

Low risk

Storm force winds
Gusts will reach 60-65mph, with a risk of 70mph over the highest peaks.
Persistent extensive hill fog
Low cloud across the mountain will soon clear southeast with only occasional patches of hill fog.
Heavy persistent rain
Persistent rain at very first will soon clear to the southeast.
Strong sunlight
Sunlight reflecting off snow covered surfaces over the higher routes make it much brighter.

No risk

Blizzards
none
Heavy snow
none
Thunderstorms
none

Fri 19 Dec 2014

Rain and broken cloud which has descended onto the mountains will clear to the southeast by the early hours. It will then be much clearer and colder through the day, with some bright sunshine in the daylight hours, this will reflect off lying snow on the highest routes producing a glare so protective eyewear is advisable for those venturing to the top of the mountains. There could be one or two showers, particularly around evening, but it should generally remain dry. Staying windy with gales.

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
Light rain Partly cloudy night Sunny intervals Sunny day Sunny day Sunny intervals Partly cloudy night Partly cloudy night
Precipitation probability
70-90% 30% 10% 0% 0% 30% 30% 20%

Visibility

Moderate, perhaps poor at fist in the rain, but soon becoming excellent, with only very temporary reductions in any showers that develop.

Hill Fog

Broken cloud to 500m, the cloud will soon break and rise above the summits with generally no hill fog aside from isolated patches down to 600m in and around showers.

Max wind above 500m

West or northwesterly 60-65mph.

Temperature

Valleys:
Plus 6 Celsius, falling to plus 3 Celsius.
800m:
Plus 1 Celsius, falling to minus 3 Celsius.
Freezing level:
Just above the summits at first, but soon falling to 700m.

Ground conditions

Latest: Date of observations: 17th December 2014 Observation made on: Snowdon Time of observation: 1:00 PM Winter conditions above: 900 m Ground Conditions: Isolated stretches of snow, Snow drifts in areas. Snowdon-Pyg Track: Compacted snow still covers the path up the ZigZags (Pyg Track-900m), snow drifts up to 2.5ft deep in places. This section of the Pyg Track has become narrow due to the drifting snow, and very slippery. 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, Ski goggles can aid visibility in strong winds and blowing snow, Take waterproofs, hat, gloves and spare warm layers

Issued at: 1534 on Thu 18 Dec 2014

Sat 20 Dec 2014

Another dry and bright and windy day. The odd shower is still possible, but they are less likely than on Friday. Remaining cold through much of the day, but becoming slightly milder at the freezing level rises later.

Visibility

Generally excellent, perhaps decreasing to good later on.

Hill Fog

Patches of well broken cloud giving hill fog to 600m. Later in the evening however, the cloud increases at 600m and occasional patches of hill fog extend down to 400m by midnight.

Max wind above 500m

West or northwesterly 65-70mph.

Temperature

Valleys:
Plus 4 Celsius.
800m:
Minus 3 Celsius rising to plus 1 Celsius.
Freezing level:
700m rising above the summits later.

Issued at: 1534 on Thu 18 Dec 2014

Sun 21 Dec 2014

Cloud building from the west with outbreaks of rain and drizzle through the day. Slightly lighter winds than on Saturday, but still with a westerly breeze. Freezing level above the summits.

Issued at: 1534 on Thu 18 Dec 2014

Mon 22 Dec 2014

Breezy with further outbreaks of rain moving in from the west with similar conditions to Sunday. Freezing level above the summits.

Issued at: 1534 on Thu 18 Dec 2014

Tue 23 Dec 2014

Wind, rain and cloud continuing at first. Later this starts to clear with cooler showery conditions developing behind. Freezing level above the summits at first, then falling to 500-600m.

Issued at: 1534 on Thu 18 Dec 2014