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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Tue 21 Oct 2014

High risk

Storm force winds
Gusts may exceed 70mph at times, especially associated with heavy showers.
Gales
Gales throughout the day, leading to considerable buffeting across all routes
Severe chill effect
Much colder air combined with very strong winds and showers will lead to a considerable wind chill.

Medium risk

Thunderstorms
Blustery showers are likely to be heavy and squally with a risk of thunder.
Heavy persistent rain
Rain through the early hours is likely to be persistent, and heavy at times.

Low risk

Persistent extensive hill fog
Isolated to 500m in heavy showers.

No risk

Blizzards
none
Heavy snow
none
Strong sunlight
none

Tue 21 Oct 2014

A very windy and bright day with sunshine and scattered heavy, squally showers. By the afternoon, these showers may fall as sleet or snow over the highest summits, though no accumulations are expected. It will remain very windy throughout the day, with widespread gales and perhaps storm force winds at times. It will be a cold day, which combined with the strong winds and showers will lead to a severe wind chill effect. Showers will gradually ease overnight into Wednesday.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Heavy shower day Heavy shower day Heavy shower day Heavy shower day Partly cloudy night Partly cloudy night
Precipitation probability
60% 60% 40% 40% 20% 0%

Visibility

Generally good or very good, moderate in showers, poor in heavy rain/showers and sleet showers, and very poor in hill fog and snow showers.

Hill Fog

As low as 500m in showers through the day.

Max wind above 500m

Southwesterly becoming Northwesterly 70mph.

Temperature

Valleys:
Plus 6 Celsius rising Plus 9 Celsius.
800m:
Plus 6 Celsius becoming Zero Celsius
Freezing level:
Above the summits, becoming 900 metres through the day.

Ground conditions

Latest: 20/04/2014 15:53 No adverse ground conditions observed by National Park Wardens

Issued at: 0235 on Tue 21 Oct 2014

Wed 22 Oct 2014

Any remaining showers will quickly die away with some clear spells forming through the early hours. Winds will ease a little, but remain generally strong. Through the morning cloud will gradually thicken from the west with outbreaks of rain likely through the afternoon. It will be a milder day than on Tuesday.

Visibility

Generally good, but moderate in rain/showers and very poor in hill fog.

Hill Fog

Occasional patches down to 500 metres in rain through the afternoon.

Max wind above 500m

Northwesterly 45mph.

Temperature

Valleys:
Plus 4 Celsius rising Plus 14 Celsius.
800m:
Plus 4 Celsius.
Freezing level:
Above the summits.

Issued at: 0235 on Tue 21 Oct 2014

Thu 23 Oct 2014

A cloudy day, with further rain, turning persistent across western slopes. Best of any brighter spells are likely to be limited to eastern slopes, with further gales possible across the tops. Freezing level above the summits.

Issued at: 0235 on Tue 21 Oct 2014

Fri 24 Oct 2014

A cloudy start and breezy once again. Rain, persistent and heavy at times will move eastwards across the range through the course of the day, bringing hill fog and difficult walking conditions through the afternoon. Freezing level remaining above the summits.

Issued at: 0235 on Tue 21 Oct 2014

Sat 25 Oct 2014

It will be another generally cloudy day, with further outbreaks of rain through the day. This is likely to turn persistent and possible heavy at times, especially over western slopes. Rain will gradually clear through the evening and overnight. A breezy day once again. Freezing levels remaining above the summits.

Issued at: 0235 on Tue 21 Oct 2014