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Snowdonia

Weather hazards over 300m on Sun 28 Aug 2016

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Hill fog may be persistent and extensive at first above 300m.
Strong sunlight
Risk of sunburn in any more prolonged spells of sunshine in the afternoon.

Low risk

Thunderstorms
An isolated thunderstorm is possible at first.

No risk

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

Sun 28 Aug 2016

Some showery rain is possible at first, with a chance of thunder but this will soon ease through the morning, giving way to a day of sunny spells and scattered showers. The showers could become locally heavy at times before easing later in the afternoon.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Heavy rain Sunny intervals Heavy shower day Light shower day Sunny intervals Partly cloudy night
Precipitation probability
30% 10% 30% 20% 0% 0%

Visibility

Generally moderate or poor in rain. becoming generally good by the afternoon, but moderate again in any heavier showers. Very poor in hill fog.

Hill Fog

Broken to blanket at first above 300m, but lifting through the morning to become mostly nil. Ragged to broken above 600m through the afternoon in heavier showers.

Max wind above 500m

North to northwest 20mph.

Temperature

Valleys:
Plus 13 Celsius rising to Plus 18 Celsius.
800m:
Plus 9 Celsius.
Freezing level:
Above the summits.

Mon 29 Aug 2016

Dry with some warm sunny spells and very isolated showers, mainly in the morning.

Visibility

Generally good or very good, but locally moderate in any showers. Very poor in hill fog.

Hill Fog

Broken above 400m at first, dispersing through the morning.

Max wind above 500m

Northwesterly 20mph.

Temperature

Valleys:
Plus 11 Celsius rising to Plus 19 Celsius.
800m:
Plus 8 Celsius.
Freezing level:
Above the summits.

Tue 30 Aug 2016

A dry and bright start with some sunny spells. Cloud and some patches of hill fog pushing in from the west during the evening. Winds light to moderate southwesterly.

Wed 31 Aug 2016

Dry at first but thickening cloud and patchy rain spreading in from the west later. Moderate west to southwest winds.

Thu 01 Sep 2016

Mostly dry with some sunny spells, but perhaps a few generally light showers. Moderate southwest winds.

Issued at: 0351 on Sun 28 Aug 2016