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Snowdonia

Weather hazards over 300m on Tue 02 Sep 2014

High risk

No high risks
none

Medium risk

No medium risks
none

Low risk

Persistent extensive hill fog
Isolated patches down to 500 metres first thing and again later in the night.

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

Tue 02 Sep 2014

Any early valley mist or fog patches should soon clear in the morning, then a largely fine day with bright or sunny spells and light winds. Feeling warm in the sunshine. Cloud will tend to increase as the day progresses, so the best of the sunshine will be in the morning. Overnight, there is a risk of some hill fog.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Sunny intervals Sunny day Sunny intervals Sunny intervals Partly cloudy night Partly cloudy night
Precipitation probability
0% 0% 0% 0% 0% 0%

Visibility

Generally good, but very poor in hill fog.

Hill Fog

Just occasional patches around the higher summits during the day, especially into the afternoon. Isolated patches down to 500 metres possible overnight.

Max wind above 500m

Northeast becoming southeast 15 mph.

Temperature

Valleys:
Plus 9 Celsius becoming plus 18 Celsius.
800m:
Plus 10 Celsius.
Freezing level:
Well above the summits.

Issued at: 0400 on Tue 02 Sep 2014

Wed 03 Sep 2014

Another largely dry and fine day, though probably cloudier than Tuesday, with only limited bright spells. The best of any sunshine will be towards the west of the park.

Visibility

Generally good, but very poor in hill fog.

Hill Fog

Isolated patches down to 500 metres overnight, lifting to leave just isolated patches around the peaks.

Max wind above 500m

Southeast 15 mph.

Temperature

Valleys:
Plus 11 Celsius becoming plus 18 Celsius.
800m:
Plus 10 Celsius.
Freezing level:
Well above the summits.

Issued at: 0400 on Tue 02 Sep 2014

Thu 04 Sep 2014

Largely dry and fine with some bright or sunny spells. A gentle southeasterly breeze. Freezing level well above the summits.

Issued at: 0400 on Tue 02 Sep 2014

Fri 05 Sep 2014

A fairly cloudy day, the cloud perhaps thick enough for the odd spot of light rain or drizzle, mainly over high ground. A gentle easterly breeze. Freezing level well above the summits.

Issued at: 0400 on Tue 02 Sep 2014

Sat 06 Sep 2014

Similar to Friday with large amounts of cloud, chance of a little drizzle, but also the odd brighter spell. A gentle northeasterly breeze. Freezing level well above the summits.

Issued at: 0400 on Tue 02 Sep 2014