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Snowdonia

Weather hazards over 300m on Fri 22 May 2015

High risk

Persistent extensive hill fog
Persistent and extensive at times above 300m through the day.

Medium risk

No medium risks
none

Low risk

No low risks
none

No risk

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

Fri 22 May 2015

Cloudy with rain or drizzle at times during the morning and afternoon, mostly light. Turning mainly dry during the late afternoon and evening, but still a chance of some drizzle. Hill fog will be widespread for much of the day, especially during the morning and again in the evening.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Fog Light rain Light rain Overcast Cloudy Fog
Precipitation probability
60% 50% 60% 50% 40% 20%

Visibility

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

Hill Fog

Broken to blanket above 300 metres, lifting for a time in the afternoon, then returning above 400 metres during the evening.

Max wind above 500m

Southerly becoming northwesterly later 25-30 mph.

Temperature

Valleys:
Plus 10 Celsius becoming plus 14 Celsius.
800m:
Plus 5 Celsius becoming plus 9 Celsius.
Freezing level:
Well above the summits.

Issued at: 0434 on Fri 22 May 2015

Sat 23 May 2015

Dry with long bright or sunny spells once early cloud and hill fog has cleared. Winds becoming mainly light.

Visibility

Generally good or very good, but very poor at first in hill fog.

Hill Fog

Broken to blanket above 400 metres at first.

Max wind above 500m

Northerly 25 mph at first.

Temperature

Valleys:
Plus 6 Celsius becoming plus 14 Celsius.
800m:
Plus 2 Celsius becoming plus 9 Celsius.
Freezing level:
Above the summits.

Issued at: 0434 on Fri 22 May 2015

Sun 24 May 2015

More general cloud and rain is likely to spread from the northwest during the morning, clearing early in the afternoon. Winds expected to become fresh or strong northwesterly during the afternoon. Hill fog will be widespread for much of the morning, lifting and breaking in the afternoon.

Issued at: 0434 on Fri 22 May 2015

Mon 25 May 2015

Still on the cool side but mostly dry with sunny spells and perhaps the odd light shower, wintry above 600 metres. Moderate to fresh northwesterly winds, with hill fog.

Issued at: 0434 on Fri 22 May 2015

Tue 26 May 2015

Rather cloudy at times but remaining mostly dry. A few light showers are still possible. Moderate to fresh northwest winds.

Issued at: 0434 on Fri 22 May 2015