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Snowdonia

Weather hazards over 300m on Fri 30 Sep 2016

High risk

No high risks
none

Medium risk

Thunderstorms
Isolated lightning strikes in heaviest showers.

Low risk

No low risks
none

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

Fri 30 Sep 2016

Friday will be a mixture of sunshine and showers. In between showers there will be some sunny spells. There is a chance of a one or two thundery downpours at times also. Through the evening cloud will increase from the west with showers probably becoming more prolonged.

Time
0000 to 0300 0300 to 0600 0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Light shower night Partly cloudy night Light shower day Heavy shower day Heavy shower day Light shower day Light shower night Heavy shower day
Precipitation probability
20% 0% 20% 40% 40% 30% 30% 50%

Visibility

Generally very good or excellent, moderate in showers. Poor in any thundery downpours.

Hill Fog

Isolated ragged areas above 600m in any heavy showers.

Max wind above 500m

Southwesterly 30-35mph slowly easing

Temperature

Valleys:
Plus 9 becoming 12 Celsius
800m:
Plus 4 Celsius
Freezing level:
Above the summits

Sat 01 Oct 2016

Showers more numerous and heavy during Saturday, with a heightened risk of thunder. Some showers may merge to give longer spells of rain. Winds will be gusty at times, especially in or near heavy showers.

Visibility

Generally very good or excellent, moderate in showers and rain. Poor in any thundery downpours.

Hill Fog

Isolated ragged areas above 600m in any heavy showers.

Max wind above 500m

Southerly becoming northerly or northwesterly during the afternoon 25mph

Temperature

Valleys:
Plus 8 becoming 12 Celsius
800m:
Plus 3 Celsius
Freezing level:
Above the summits

Sun 02 Oct 2016

A largely dry fine day with lighter winds is expected. It will start chilly, with some valley mist and fog possible, but these should lift and clear to allow some fine conditions across the tops.

Mon 03 Oct 2016

Cloudier and more breezy on Monday with freshening southeasterly winds reaching 40mph by the end of the day. It should stay mostly dry. There is however a band of rain that looks to sit just off the west coast of Wales, and could push in across the area later in the evening.

Tue 04 Oct 2016

Current indications are for mainly dry conditions to continue but the band of rain will never be too far to the west of the area. Southeast winds remaining rather strong across summits. with gusts reaching 40mph.

Issued at: 1558 on Thu 29 Sep 2016