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Snowdonia

Weather hazards over 300m on Wed 03 Sep 2014

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Occasional hill fog across eastern hills tonight, patchier in the west. Lifting during morning.
Strong sunlight
Given the time of year, there will be a risk of sunburn in the sunny spells that develop.

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

Wed 03 Sep 2014

Areas of low cloud will spread across the park overnight bringing occasional hill fog, mainly in the east. The low cloud may be thick enough for the odd drizzly outbreak. However, western hills may remain clearer. This low cloud and any mist patches through the valley floors will lift and break up through the morning with sunny spells developing, the best of sunshine will be in the west during the afternoon. It will feel warm in the sunshine with light winds.

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 Cloudy Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Partly cloudy night
Precipitation probability
10% 20% 10% 0% 10% 10% 0% 0%

Visibility

Generally good or very good below the cloud bases, and perhaps becoming excellent by afternoon. However, the visibility will be less than 100m where shrouded in the cloud.

Hill Fog

Areas of low cloud will develop overnight, bringing occasional hill fog across eastern hills with bases down to 300m. In the west, the hill fog will be patchier. Through the morning, the low cloud will lift and break up with all summits becoming clear of cloud by the afternoon. Patchy hill of may reform across eastern upslopes by late evening.

Max wind above 500m

Southeast 15-20mph

Temperature

Valleys:
Plus 10 becoming 22 Celsius during the afternoon.
800m:
Plus 11 Celsius
Freezing level:
Above the summits.

Issued at: 1715 on Tue 02 Sep 2014

Thu 04 Sep 2014

Any mist and fog patches will soon clear through the morning to leave a bright day across the park with some sunshine, perhaps prolonged. With lights winds, it will feel warm in the sunshine, especially through sheltered valley floors. Thicker cloud may spread in from the east later in the evening.

Visibility

Generally very good or excellent with distant hills clearly discernible. However, the visibilities will be very poor in any early fog/hill fog.

Hill Fog

Areas of low cloud and mist patches through the valley floors with develop overnight bringing occasional hill fog, mainly in the east. However, this will clear through the morning to leave all summits clear of cloud by afternoon.

Max wind above 500m

Southeasterly 10-15mph.

Temperature

Valleys:
Plus 10 becoming 22 Celsius
800m:
Plus 11 Celsius
Freezing level:
Above the summits.

Issued at: 1715 on Tue 02 Sep 2014

Fri 05 Sep 2014

A fairly cloudy start to the day. The cloud perhaps thick enough for the odd spot of light rain or drizzle. However, sunny spells are likely to develop through the day with hill fog clearing. A gentle easterly breeze. Freezing level well above the summits.

Issued at: 1715 on Tue 02 Sep 2014

Sat 06 Sep 2014

Often large amounts of cloud on Saturday, chance of a little drizzle, but there will be some sunnier breaks at times. Moderate easterly winds. Freezing level well above the summits.

Issued at: 1715 on Tue 02 Sep 2014

Sun 07 Sep 2014

Cloud and hill fog may well be more extensive on Sunday, especially in the morning, with some patchy rain and drizzle possible. The best of any bright or sunny breaks will be during the afternoon. Showery rain may spread up from the southwest later in the day. Moderate to occasionally fresh easterly winds.

Issued at: 1715 on Tue 02 Sep 2014