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Snowdonia

Weather hazards over 1000ft

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Patchy hill fog during the day in eastern parts. Becoming widespread later in the afternoon.
Thunderstorms
Showers through the afternoon may be heavy and thundery.

Low risk

Gales
Winds will strengthen on Friday night, low risk gale force by midnight.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Severe chill effect
none
Heavy persistent rain
none
Strong sunlight
none

Fri 25 Apr 2014

A cloudy, dull day in eastern parts of the park. Further west there will be more cloud breaks and sunny spells. Showers developing in the afternoon may be heavy and thundery at times. Cloud thickening and winds strenthening towards midnight.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Cloudy Light shower day Heavy shower day Heavy shower day Light shower night Light rain
Precipitation probability
10% 60% 60% 60% 60% 60%

Visibility

Generally good or moderate. Poor in any showers or rain. Very poor in thunderstorms and hill fog.

Hill Fog

Patches down to 400 metres through the day will be more extensive in eastern parts of the park, and thinner in the west. From dusk this will become widespread and thick.

Max wind above 500m

Northeasterly 20 mph through day time, becoming southerly 40mph through the evening, then small risk 50mph by midnight.

Temperature

Valleys:
Plus 8 rising to 14 Celsius.
800m:
Plus 5 Celsius
Freezing level:
Well above the summits.

Issued at: 0435 on Fri 25 Apr 2014

Sat 26 Apr 2014

A windy day, with a good chance of gales along the peaks. Bands of rain will pass through during the day, with some drier sunnier interludes inbetween.

Visibility

Generally good, moderate in any rain or showers, very poor in heavy showers and hill fog.

Hill Fog

Hill fog down to 400 metres in any rain and showers.

Max wind above 500m

60mph. southerly at first, becoming southeasterly through the day.

Temperature

Valleys:
Plus 8 rising to 14 Celsius
800m:
Plus 4 Celsius
Freezing level:
Above the summits.

Issued at: 0435 on Fri 25 Apr 2014

Sun 27 Apr 2014

Remaining unsettled, but less rain than on Saturday, and winds less strong. Sunny spells inbetween showers. Hill fog above 500 metres expected in showers.

Issued at: 0435 on Fri 25 Apr 2014

Mon 28 Apr 2014

Mainly dry with moderate winds. Small chance of some showers. Extensive hill fog to 200 metres, rising above the summits by lunch time.

Issued at: 0435 on Fri 25 Apr 2014

Tue 29 Apr 2014

Scattered showers and sunny spells. Extensive hill fog to 200 metres, rising above the summits by lunch time.

Issued at: 0435 on Fri 25 Apr 2014