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Snowdonia

Weather hazards over 300m on Thu 26 May 2016

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Widespread hill fog above 500 metres at first resulting in major navigation difficulties.

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

Thu 26 May 2016

A cloudy start to the day with widespread hill fog above 500 metres, and periods of mainly light rain or drizzle. Cloud bases will lift and break with sunny spells developing during the late afternoon in the south. Feeling warm in sunshine.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Light rain Light rain Cloudy Sunny intervals Sunny intervals Partly cloudy night
Precipitation probability
40% 30% 10% 0% 0% 0%

Visibility

Moderate to poor or very poor with mist and hill fog above 500 metres at first. Slowly improving during the morning becoming mainly good during the afternoon.

Hill Fog

Widespread hill fog above 500 metres at first, slowly lifting and breaking to well broken above 700 metres during the afternoon.

Max wind above 500m

Easterly mainly light 10 to 15 mph.

Temperature

Valleys:
Plus 5 becoming 15 Celsius
800m:
Plus 7 becoming 10 Celsius
Freezing level:
Above summits.

Fri 27 May 2016

Early mist patches will clear to leave a fine morning with sunny spells, however there is a risk of scattered heavy and locally thundery showers developing through the afternoon. Light winds. Feeling warmer in afternoon sunshine.

Visibility

Poor in early mist otherwise moderate becoming good. Poor again in thundery showers.

Hill Fog

Broken patches above 600 metres in heavy showers.

Max wind above 500m

Easterly 15 mph

Temperature

Valleys:
Plus 5 becoming 19 Celsius
800m:
Plus 10 Celsius
Freezing level:
Above summits.

Sat 28 May 2016

Another day of sunny spells, interspersed with a scattering of showers, perhaps heavy and thundery at times. Feeling warm and humid with light winds.

Sun 29 May 2016

Similar to Saturday with sunny spells but perhaps a lower risk of showers.

Mon 30 May 2016

Mostly dry with long clear or sunny spells. Strong northerly winds developing.

Issued at: 0353 on Thu 26 May 2016