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Snowdonia

Weather hazards over 300m on Thu 28 Aug 2014

High risk

No high risks
none

Medium risk

Gales
Southwesterly winds could reach mean speeds of 40mph, with gusts to around 50mph by late evening.
Persistent extensive hill fog
Low cloud bases are expected at times throughout the morning.

Low risk

Severe chill effect
Feeling closer to 5C in exposure to the gale force southwesterly winds.
Strong sunlight
Moderate to high UV levels during the afternoon.

No risk

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

Thu 28 Aug 2014

Outbreaks of rain will soon clear away after midnight, with cloud lifting and breaking for a time. It will turn cloudier again during the morning however as a band of showery rain pushes eastwards across Wales, with some heavier downpours and strong gusts likely in association. The afternoon will be much improved though, with dry and bright weather and a few spells of sunshine to end the day. Further outbreaks of rain may affect areas to the northwest at the end of the evening. It will be rather breezy throughout, especially over exposed ridges and summits.

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
Cloudy Partly cloudy night Light shower day Light shower day Light shower day Sunny intervals Sunny intervals Light shower night
Precipitation probability
40% 30% 50-70% 50-70% 50-70% 0% 0% 30%

Visibility

Good becoming very good, although temporarily reducing to moderate or poor during showers. Poor in any hill fog.

Hill Fog

Bases 500-700 metres fairly widely at first. This soon breaking and mostly lifting above the summits, however further fog will spread eastwards across hills above 500 metres as showery rain arrives by mid-morning. Generally nil by the afternoon, but areas down to 700 metres once again by the end of the evening.

Max wind above 500m

Southwesterly 25-30mph with gusts 35-40mph near any showers. Increasing to mean 35-40mph with gusts 45-50mph later in the evening.

Temperature

Valleys:
Plus 10 becoming 19 Celsius.
800m:
Plus 10 Celsius.
Freezing level:
Above the summits.

Issued at: 1651 on Wed 27 Aug 2014

Fri 29 Aug 2014

Remaining unsettled and windy with scattered blustery showers. Some of these may turn thundery or merge into longer spells of rain. Hill fog is likely to be rather extensive during the afternoon, and gales are expected to develop during the morning leading to a significant chill effect.

Visibility

Very good, but reducing to moderate or poor in showers. Very poor in hill fog.

Hill Fog

A few patches of fog around 500-700 metres during the early morning. Then nil for a time until mid-afternoon, when bases will fall to 400-600 metres fairly widely, particularly over the western side of the park.

Max wind above 500m

Southwesterly 30-35mph with gusts 45-50mph, gradually veering westerly and easing a little during the evening.

Temperature

Valleys:
Plus 10 becoming 18 Celsius.
800m:
Plus 9 Celsius.
Freezing level:
Above the summits.

Issued at: 1651 on Wed 27 Aug 2014

Sat 30 Aug 2014

A brighter day than of late with sunny spells and just a scattering of showers. The showers may ease from the west later in the day. Westerly winds will be much lighter than on Friday, although perhaps still gusty at times near showers.

Issued at: 1651 on Wed 27 Aug 2014

Sun 31 Aug 2014

Cool, dry and largely clear overnight, then staying mostly dry with bright or sunny spells during the day. There's a chance of a few showers, but these only light. It will be windy at first, but easing later.

Issued at: 1651 on Wed 27 Aug 2014

Mon 01 Sep 2014

Rather cloudy with some patchy light rain possible. Brighter or clearer conditions are likely towards the end of the day. Moderate southwesterly winds and areas of hill fog at times.

Issued at: 1651 on Wed 27 Aug 2014