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Snowdonia

Weather hazards over 300m on Sun 25 Sep 2016

High risk

No high risks
none

Medium risk

No medium risks
none

Low risk

Thunderstorms
Isolated thunderstorms are possible, mainly during the afternoon.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Severe chill effect
none
Persistent extensive hill fog
none
Heavy persistent rain
none
Strong sunlight
none

Sun 25 Sep 2016

Some sunny spells are expected but also occasional heavy, blustery showers, with a low risk of hail and thunderstorms giving associated low risk of lightning, especially during the afternoon.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Light shower day Heavy shower day Heavy shower day Heavy shower day Heavy shower day Partly cloudy night
Precipitation probability
20% 30% 50% 50% 30% 0%

Visibility

Good or very good, but moderate to poor in heavy showers and in any thunderstorms, and very poor in hill fog.

Hill Fog

Occasional broken hill fog is likely above 550m in association with heavy showers.

Max wind above 500m

West to southwest 25-30mph gusts 40-45mph.

Temperature

Valleys:
Plus 9 rising to 15 Celsius.
800m:
Plus 5 Celsius.
Freezing level:
Above the summits.

Mon 26 Sep 2016

Mainly dry at first, but thickening cloud and rain, heavy at times spreading across the area by dawn and persisting for much of the day. Some heavy and persistent rain is possible. Extensive hill fog is expected with strong south to southwest winds developing.

Visibility

Perhaps good at first, but generally moderate to poor in rain and very poor in hill fog.

Hill Fog

Occasional broken above 500m at first, but becoming blanket above 300m during the morning.

Max wind above 500m

Southwest 30-35mph, increasing to 45-50mph later.

Temperature

Valleys:
Plus 10 becoming 15 Celsius.
800m:
Plus 4 Celsius rising to Plus 8 Celsius.
Freezing level:
Above the summits.

Tue 27 Sep 2016

Cloud and outbreaks of rain will clear from the west during the morning, with some sunny spells following but also scattered showers with strong westerly or southwesterly winds developing.

Wed 28 Sep 2016

A generally cloudy day with some rain and drizzle at times. Winds will be strong with gales likely as winds reach gusts 55mph, probably later in the day.

Thu 29 Sep 2016

Another mainly cloudy day is expected with further rain and drizzle likely, especially during the morning with strong to gale westerly or southwesterly winds slowly decreasing. Some brightness with heavy, thundery showers possible later in the day.

Issued at: 0338 on Sun 25 Sep 2016