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Snowdonia

Weather hazards over 300m on Wed 29 Jun 2016

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Difficult navigation through the morning, with hills above 400m shrouded, and occasionally lower.
Heavy persistent rain
Rain into early afternoon will be persistent and occasionally heavy, leading to treacherous paths.

Low risk

Gales
Considerable buffeting likely over high level ridges and highest tops, with 50-55mph gusts.
Strong sunlight
Some sunny spells later in the day may bring increased UV levels.

No risk

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

Wed 29 Jun 2016

Starting cloudy with outbreaks of rain, persistent and heavy at times, especially in the west, leading to a difficult morning on the hills. There will also be a strong westerly breeze. However, more general rain will clear by early afternoon, followed by some sunny spells and occasional showers, perhaps heavy at times. Showers then dying out through the evening.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Heavy rain Heavy rain Sunny intervals Sunny intervals Sunny intervals Partly cloudy night
Precipitation probability
60% 60% 40% 40% 40% 10%

Visibility

Moderate to very poor through the morning, this increasing by the afternoon, with plenty of good to very good periods developing, but remaining moderate to very poor where showers occur and hill fog persists.

Hill Fog

Widespread blanket at 400m, with ragged patches as low as 200m in the west. This lifting and breaking through the day, with tops generally clear by mid-afternoon. However patchy hill fog returning above 700m during heavy showers.

Max wind above 500m

Southwesterly 50-55mph during the morning.

Temperature

Valleys:
Plus 8 Celsius becoming Plus 17 Celsius
800m:
Plus 6 Celsius
Freezing level:
Above the summits.

Thu 30 Jun 2016

Dry overnight, with clear spells but breezy on the hills. Sunny at first on Thursday, although some cloud will build during the day. This will bring a risk of a few showers, perhaps heavy, and merging to give some more general showery rain by evening. There will also be a strong breeze, so despite the sunny spells, it will be feeling rather chilly.

Visibility

Generally good to very good, falling to moderate in the showers.

Hill Fog

Generally nil, but some ragged patches possible above 700m in heavy showers.

Max wind above 500m

Westerly 30-35mph, becoming Southwesterly 45-50mph overnight.

Temperature

Valleys:
Plus 10 Celsius becoming Plus 16 Celsius
800m:
Plus 5 Celsius
Freezing level:
Above the summits.

Fri 01 Jul 2016

A day of sunshine and scattered, occasionally heavy showers is expected, with isolated thunder possible. It will remain breezy, with gales possible across the tops. These will be most likely during heavy showers. Away from showers, there will be some warm sunshine, but it will be feeling cold in the breeze.

Sat 02 Jul 2016

A similar day to Friday, with plenty of sunshine likely, but also scattered showers. It will also be windy, although perhaps less so than on Friday. Showers will ease during the afternoon.

Sun 03 Jul 2016

Some uncertainty, with current expectations for more some more general cloud and rain to spread east across the area during the day. Windy at times.

Issued at: 0432 on Wed 29 Jun 2016