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Snowdonia

Weather hazards over 300m on Mon 15 Sep 2014

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Hill fog above 300 m, most extensive in the east, becoming patchy later in the day.
Strong sunlight
Sunny spells will lead to a risk of sunburn, mainly 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

Mon 15 Sep 2014

Mainly fine throughout much of the day, although it will be rather cloudy to start with some hill fog and patchy drizzle at first. The hill fog will be most extensive in the east and should become more isolated through the day as the cloud breaks up and some warm sunny spells develop. Cloud and hill fog will return overnight.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Mist Cloudy Sunny intervals Sunny intervals Sunny intervals Partly cloudy night
Precipitation probability
40% 40% 20% 10% 10% 10%

Visibility

Generally moderate, but poor to very poor in hill fog and drizzle at first, increasing to become good in sunny spells during the afternoon.

Hill Fog

Periods of hill fog around 500 m, but occasionally down to 300 m in the east. This will lift and break through the day, with the best chance of clear summits in the west later. The hill fog will return overnight.

Max wind above 500m

Northeasterly 25 mph.

Temperature

Valleys:
Plus 19 Celsius.
800m:
Plus 10 Celsius.
Freezing level:
Above the summits.

Issued at: 0333 on Mon 15 Sep 2014

Tue 16 Sep 2014

A cloudy start with periods of hill fog. This will be most extensive in the east, but will lift and break up through the day as warm sunny spells develop. Staying dry and mostly clear through the evening.

Visibility

Generally moderate, but poor to very poor in hill fog and drizzle at first, increasing to become good to very good in sunny spells during the afternoon.

Hill Fog

Periods of hill fog around 500 m, but occasionally down to 100 m in the east. This will lift and break, possibly clearing the summits and leaving fine conditions on the hills in the afternoon.

Max wind above 500m

Easterly 20 mph.

Temperature

Valleys:
Plus 20 Celsius.
800m:
Plus 11 Celsius.
Freezing level:
Above the summits.

Issued at: 0333 on Mon 15 Sep 2014

Wed 17 Sep 2014

Staying generally fine through Wednesday, with any early mist and fog patches soon clearing to leave a dry and often sunny afternoon.

Issued at: 0333 on Mon 15 Sep 2014

Thu 18 Sep 2014

Another fine and dry day on the hills, although the odd isolated shower cannot be ruled out. There will continue to be sunny spells, variable cloud and patchy hill fog in places. Winds will generally be light, although moderate over the tops.

Issued at: 0333 on Mon 15 Sep 2014

Fri 19 Sep 2014

Mostly fine and dry on Friday, although the odd shower is possible. There will be variable cloud with patchy hill fog at times, but there will be some warm sunny spells too. Generally light winds.

Issued at: 0333 on Mon 15 Sep 2014