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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Sun 30 Aug 2015

High risk

No high risks
none

Medium risk

No medium risks
none

Low risk

Strong sunlight
Brief afternoon sunny spells give a risk of exposure to strong sunlight.

No risk

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

Sun 30 Aug 2015

Dry and chilly at first with clear spells and perhaps some valley mist patches. It will turn increasingly cloudy through the morning with occasional outbreaks of rain likely through the day. Northern areas will tend to be driest with cloud thinning at times to give some brighter spells in the afternoon,

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
Partly cloudy night Partly cloudy night Light rain Light rain Light shower day Light rain Light shower day Light rain
Precipitation probability
0% 0% 60% 70% 60% 60% 60% 60%

Visibility

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

Hill Fog

Occasional hill fog above 500 metres.

Max wind above 500m

Southwesterly 25 mph.

Temperature

Valleys:
Plus 7 Celsius rising to plus 19 Celsius.
800m:
Plus 10 Celsius.
Freezing level:
Above the summits.

Mon 31 Aug 2015

Some clear spells overnight, but cloudy through much of the day with outbreaks of rain continuing across the park, perhaps turning heavy in places, most likely during the afternoon. it may become drier through the evening.

Visibility

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

Hill Fog

Occasional hill fog above 400 metres.

Max wind above 500m

Northerly 25 mph.

Temperature

Valleys:
Plus 9 Celsius rising to plus 17 Celsius.
800m:
Plus 10 Celsius.
Freezing level:
Above the summits.

Tue 01 Sep 2015

A chilly start with some mist patches. There should be sunny spells through the day, although with the risk of isolated showers at times. Temperatures a little below average for the time of year in a northwesterly breeze, although still pleasant in sunny spells.

Wed 02 Sep 2015

Another chilly and perhaps misty start, then a similar day to Tuesday with variable cloud giving sunny spells and perhaps the odd shower. Winds should become light through the day.

Thu 03 Sep 2015

Some overnight mist patches. It should be largely dry through the day with light winds and some warm sunny spells. Just a slight chance of a few isolated showers.

Issued at: 1617 on Sat 29 Aug 2015