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Snowdonia

Weather hazards over 300m on Tue 30 Sep 2014

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Periods above 400m at first. Then some persistent hill fog above 400m developing in the afternoon.

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

Tue 30 Sep 2014

Low cloud, mist and fog will disperse this morning. However a band of cloud and outbreaks of rain will spread from the west this afternoon. Winds also strengthening during the day. Rain then largely clearing before midnight.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Sunny intervals Sunny intervals Sunny intervals Light rain Light rain Partly cloudy night
Precipitation probability
10% 10% 40% 80% 70% 30%

Visibility

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

Hill Fog

Occasional periods above 400 metres at first, lifting to give the odd patch above 500 metres. However broken to overcast cloud pushing in from the west in the afternoon is likely to give some persistent and extensive hill fog above 400 metres, with patches down to 300 metres across western slopes.

Max wind above 500m

Southwesterly 45 mph later.

Temperature

Valleys:
Plus 9, becoming plus 18 Celsius.
800m:
Plus 11 Celsius.
Freezing level:
Above the summits.

Issued at: 0408 on Tue 30 Sep 2014

Wed 01 Oct 2014

Generally rather cloudy, with further patchy rain or drizzle at times. Best of any brighter spells most likely across northeastern parts of the park. Winds gradually easing during the day. Skies clearing during the evening, and turning much cooler.

Visibility

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

Hill Fog

Well-broken to broken cloud giving occasional periods above 500 metres, with the odd patch down to 400 metres across western and southern facing slopes.

Max wind above 500m

Southwesterly 35mph at first.

Temperature

Valleys:
Plus 9, becoming 16 Celsius.
800m:
Plus 8 Celsius.
Freezing level:
Above the summits.

Issued at: 0408 on Tue 30 Sep 2014

Thu 02 Oct 2014

A chilly start, with a risk of a local frost. Then a largely dry and fine day with some fresh Autumn sunshine. Winds strengthening slightly later.

Issued at: 0408 on Tue 30 Sep 2014

Fri 03 Oct 2014

A windy day, with a risk of gales. Becoming increasingly cloudy as a band of persistent and locally heavy rain moves southeastwards across the park through the afternoon and evening.

Issued at: 0408 on Tue 30 Sep 2014

Sat 04 Oct 2014

Wet and windy conditions clearing southeastwards during the early hours of Saturday, with clearer and fresher conditions following. However there is likely to be some showers, which could be heavy at times. Remaining breezy.

Issued at: 0408 on Tue 30 Sep 2014