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Snowdonia

Weather hazards over 300m on Thu 25 Aug 2016

High risk

Thunderstorms
There is a risk of thunderstorms throughout, passing east during the evening.

Medium risk

Persistent extensive hill fog
High humidity and occasional showery rain may lead to periods around 400 metres throughout.

Low risk

Heavy persistent rain
Light southwesterly winds should move bouts of showery rain through.
Strong sunlight
Cloud cover should limit UV exposure times.

No risk

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

Thu 25 Aug 2016

Rather cloudy for much of the day, with bouts of showery rain making erratic progress through the area from the south. These spells of rain carry a risk of thunder, with this possibly elevated at first, but increasingly likely to be accompanied by rain as the day progresses Sunny spells will be limited, but perhaps more likely by evening in the west, but given light winds and high humidity, some hill fog is likely to survive on the lower slopes for much of the day.

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
Cloudy Cloudy Light rain Light shower day Thunder shower day Light shower day Sunny intervals Partly cloudy night
Precipitation probability
10% 10% 40% 60% 60% 60% 20% 10%

Visibility

Generally good, but moderating in showery rain.

Hill Fog

Periods around 400m throughout given light winds, occasional showery rain and high humidity.

Max wind above 500m

Southwesterly 20mph.

Temperature

Valleys:
Plus 11 becoming 19 Celsius.
800m:
Plus 12 Celsius.
Freezing level:
Well above the summits.

Fri 26 Aug 2016

A drier, brighter and fresher day, with early hill fog clearing to leave a dry day with plenty of warm sunny spells and light southwesterly winds.

Visibility

Good.

Hill Fog

Some local valley fog possible, otherwise well-broken around 600m.

Max wind above 500m

Southwesterly 20mph.

Temperature

Valleys:
Plus 9 becoming 20 Celsius.
800m:
Plus 11 Celsius
Freezing level:
Well above the summits.

Sat 27 Aug 2016

Perhaps a fine start, but with an increasing risk of showery rain spreading in from the southeast. There is a chance of some heavy downpours later, with accompanying thunder. Feeling increasingly humid.

Sun 28 Aug 2016

Relatively low confidence in details, but remaining on the unsettled side, with some slow-moving, heavy and possibly thundery showers in light winds. Some decent dry spells are also possible in between, with a tendency towards improvement later.

Mon 29 Aug 2016

Probably an improved day, with some sunny spells and a few showers, with the northwesterly wind contributing to a fresher feel.

Issued at: 1631 on Wed 24 Aug 2016