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Snowdonia

Weather hazards over 1000ft

High risk

No high risks
none

Medium risk

Strong sunlight
Plenty of sunshine, especially during the morning.

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

Sat 19 Apr 2014

A cold start with a frost and temperatures locally below freezing. Any early mist patches should quickly clear to leave a largely sunny morning with temperatures soon recovering. There may be some patchy cloud on eastern slopes however. During the afternoon it will turn cloudier but still with some good sunny spells, especially in the west. Feeling pleasant in the sunshine while walking, but chilly in the breeze.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Sunny day Sunny intervals Sunny intervals Sunny intervals Partly cloudy night Partly cloudy night
Precipitation probability
0% 0% 0% 0% 0% 0%

Visibility

Very good, but poor in any mist or patchy hill fog.

Hill Fog

Well broken at around 500m at first, mainly on eastern slopes, soon dispersing and lifting above the summits.

Max wind above 500m

East or southeasterly 15-20mph.

Temperature

Valleys:
Plus 1 Celsius rising to plus 13 Celsius.
800m:
Zero rising to plus 4 Celsius.
Freezing level:
Around 800m rising above the summits.

Ground conditions

Latest: 07/04/2014 14:24 Yr Wyddfa/Snowdon: Some small patches of snow above 900m.

Issued at: 0439 on Sat 19 Apr 2014

Sun 20 Apr 2014

A dry start, but clouding over through the early hours will hill fog developing and becoming quite extensive through the morning. There remains a large amount of uncertainty at this stage, but outbreaks of rain may spread from the southeast during the afternoon, particularly across the south of the park. Strong northeasterly winds developing with a risk of gales over the summits later.

Visibility

Good, becoming moderate or poor in rain, very poor in hill fog.

Hill Fog

Becoming broken at around 500m through the early hours then extensive during the afternoon with occasional patches above 200m.

Max wind above 500m

Northeasterly 25-35mph with gusts approaching 50mph.

Temperature

Valleys:
Plus 2 Celsius rising to plus 12 Celsius.
800m:
Plus 3 Celsius rising to plus 5 Celsius.
Freezing level:
Above the summits.

Issued at: 0439 on Sat 19 Apr 2014

Mon 21 Apr 2014

Some brighter spells, but overall rather cloudy with showers which may be heavy and thundery at times, perhaps merging into a longer spell of rain at times. Feeling cool in moderate to strong northeasterly winds and where rain persists. Extensive hill fog likely, particularly in any persistent rain.

Issued at: 0439 on Sat 19 Apr 2014

Tue 22 Apr 2014

Lighter winds than recent days leading to some fog patches in the valleys at first as well as over hills. Some bright spells, but there will still be heavy showers.

Issued at: 0439 on Sat 19 Apr 2014

Wed 23 Apr 2014

Some drier brighter spells initially after any early fog clears, but then another unsettled spell of weather with outbreaks of rain spreading northeastwards across the park. Perhaps drier later in the day. Temperatures around normal but breezier than Tuesday.

Issued at: 0439 on Sat 19 Apr 2014