Use my current location crosshair

Snowdonia

Weather hazards over 300m on Thu 07 May 2015

High risk

No high risks
none

Medium risk

Strong sunlight
Any more prolonged sunny intervals will give a risk of sunburn.

Low risk

No low risks
none

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Severe chill effect
none
Persistent extensive hill fog
none
Thunderstorms
none
Heavy persistent rain
none

Thu 07 May 2015

An improved day compared to Wednesday. Broken cloud will give some sunny intervals, but the small risk of an isolated afternoon shower developing. Much lighter winds.

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 shower night Light shower night Sunny intervals Sunny intervals Light shower day Light shower day Sunny intervals Partly cloudy night
Precipitation probability
20% 10% 0% 0% 20% 10% 0% 0%

Visibility

Generally good.

Hill Fog

Perhaps some brief ragged patches at first on the higher peaks around dawn.

Max wind above 500m

West to northwesterly 10-15mph.

Temperature

Valleys:
Plus 3 Celsius rising to Plus 12 Celsius.
800m:
Minus 1 to Plus 2 Celsius.
Freezing level:
Near 900m at first, rising just above summits by afternoon.

Issued at: 1734 on Wed 06 May 2015

Fri 08 May 2015

Rather cloudy, but some bright or sunny intervals for a time in the morning. Thicker cloud layers spreading from the southwest in the afternoon, accompanied by outbreaks of rain, and increasing amounts of hill fog patches on the higher peaks. Winds starting off light east to southeasterly, but becoming fresh to strong from the south by evening.

Visibility

Generally good, but lowering to moderate in rain later, and very poor in hill fog patches.

Hill Fog

Some broken hill fog patches likely at first, lifting, but further blanket hill fog patches likely to develop later in outbreaks of rain.

Max wind above 500m

Increasing to southerly 35-40mph by evening.

Temperature

Valleys:
Plus 4 Celsius rising to Plus 13 Celsius.
800m:
Plus 4 Celsius
Freezing level:
Above summits.

Issued at: 1734 on Wed 06 May 2015

Sat 09 May 2015

A brighter but rather windy day, with some heavy blustery showers during the first half of the day, giving a risk of thunder. These heavy showers should ease through the afternoon as drier conditions spread from the west, with winds gradually moderating by evening. Good visibility out of showers, but moderate or poor in heavy showers. Freezing levels above summits.

Issued at: 1734 on Wed 06 May 2015

Sun 10 May 2015

A mainly dry day in prospect with rather large cloud amounts but generally good visibility. Some morning hill fog patches are likely, and these may persist on the higher southwest-facing peaks. Winds increasing fresh to strong southwesterly at height. Freezing levels above summits.

Issued at: 1734 on Wed 06 May 2015

Mon 11 May 2015

Similar conditions to Sunday, but there is some uncertainty regarding the southward progress of a weather front, which may bring thicker cloud layers, and some outbreaks of rain from the north later. Hill fog patches are likely to be persistent on southwest-facing peaks.

Issued at: 1734 on Wed 06 May 2015