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Snowdonia

Weather hazards over 300m on Wed 08 Jul 2015

High risk

No high risks
none

Medium risk

No medium risks
none

Low risk

Persistent extensive hill fog
Hill fog may be temporarily widespread during the early hours and morning.

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

Wed 08 Jul 2015

A generally cloudy day with periods of rain or showers. Rain may be locally heavy for a time during the early hours and morning. Conditions will generally be drier through the afternoon and evening. Local bright spells are possible, especially to the lee of high ground to the southeast parts. Patchy or occasionally widespread hill fog is likely above 600 to 700 metres, particularly during the morning.

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 day Light shower day Light rain Light rain Cloudy Cloudy Cloudy Cloudy
Precipitation probability
70-90% 70-90% 50-70% 30-50% 20% 20% 10% 10%

Visibility

Moderate in rain, and poor or very poor in hill fog. Otherwise good.

Hill Fog

Patchy or occasionally widespread hill fog is likely above 600 metres at times, especially during the morning.

Max wind above 500m

West to northwest strong with gusts to 40 mph on peaks.

Temperature

Valleys:
Plus 19 Celsius
800m:
Plus 10 Celsius
Freezing level:
Will be above the tops.

Thu 09 Jul 2015

Most places will be dry with patches of hill fog at first. Clear spells are possible overnight with a chilly feel as temperatures lower to single figures. Bright or sunny spells will develop during the day with warmer air spreading from the southwest. Winds will be light or moderate on peaks.

Visibility

Mainly good, but locally moderate in mist and drizzle, and very poor in patchy hill fog.

Hill Fog

Patches of hill fog are possible above 700 metres in the early hours, then quickly lifting and breaking.

Max wind above 500m

West to northwest with speeds 20 to 30 mph, backing southwest later and easing.

Temperature

Valleys:
Plus 10 becoming 20 Celsius
800m:
Plus 5 Celsius becoming plus 10 Celsius
Freezing level:
Will be above the tops.

Fri 10 Jul 2015

It will be dry and warm for much of the day with some good sunny spells. Winds will be southerly and fairly light. Scattered showers or periods of rain will likely develop during the evening and overnight.

Sat 11 Jul 2015

Broken cloud is expected through the day with showers or spells of light rain. Some bright periods are possible with fresh occasionally strong southwesterly winds. Cloud will lower later with hill fog developing on hills.

Sun 12 Jul 2015

Cloudy with periods of rain or drizzle, becoming drier later with some brighter periods possible. Brisk or strong west or southwest winds.

Issued at: 1658 on Tue 07 Jul 2015