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Snowdonia mountain area forecast

Sunday, 21 March 2010: dawn to dusk

Forecast issued: 0307 on Sunday, 21 March 2010

Latest pressure

Updated: 1537 on Sun 21 Mar 2010

Digital Map Data:
© Collins Bartholomew Ltd (2006)

Overview for Sunday

Generally dry and fine in the morning, becoming cloudier in the afternoon with the risk of a little light rain and periods of hill fog.

Hazards	Risk	Explanation
Blizzards	No Risk
Heavy snow	No Risk
Storm force winds	No Risk
Gales	Low	Winds are expected to remain below gale force, but may approach 50mph in the late afternoon.
Severe chill effect	No Risk
Persistent and extensive hill fog	Medium	Periods of hill fog at 200 to 300 metres during the afternoon.
Thunderstorms	No Risk
Heavy persistent rain	No Risk

Hazards

Risk

Explanation

Blizzards

No Risk

Heavy snow

No Risk

Storm force winds

No Risk

Gales

Low

Winds are expected to remain below gale force, but may approach 50mph in the late afternoon.

Severe chill effect

No Risk

Persistent and extensive hill fog

Medium

Periods of hill fog at 200 to 300 metres during the afternoon.

Thunderstorms

No Risk

Heavy persistent rain

No Risk

Weather summary and probability of precipitation for Sunday
Dawn to 0900	0900 to 1200	1200 to 1500	1500 to dusk
Sunny	Sunny intervals	Cloudy	Cloudy
0%	10%	60%	80%

Weather summary and probability of precipitation for Sunday

Dawn to 0900

0900 to 1200

1200 to 1500

1500 to dusk

Sunny

Sunny intervals

Cloudy

10%

60%

80%

Detailed mountain weather forecast: Snowdonia

Sunday
Monday
Outlook

Sunday

Weather

Some fog in the valleys at first but this should clear to leave a dry morning with some sunshine. It will become cloudier during the afternoon with the risk of a little light rain and period of hill fog. This being most likely to occur in the west of Snowdonia

Visibility

Generally very good but becoming moderate or good after midday, and less than 200 metres in hill fog.

Hill fog

Periods of hill fog developing during the afternoon especially in the west of snowdonia above about 200 to 300 metres.

Maximum winds above 500m

Southwesterly 30-45mph

Temperature

Valleys	Plus 4 Celsius rising to plus 9 Celsius
900 m	Plus 2 Celsius
Freezing level	Above summits.

Monday

Weather

Cloudy and windy with outbreaks of rain in the morning. Becoming drier and brighter in the afternoon but still with a chance of showers.

Visibility

Generally moderate or good, but less than 200 metres in hill fog. Improving to become very good in the afternoon and evening.

Hill fog

Periods of hill fog at 500 metres at first, but this lifts and breaks with only isolated patches around the summits by afternoon.

Maximum winds above 500m

Southwesterly 50-60mph

Temperature

Valleys	Plus 4 Celsius
900 m	Plus 2 Celsius
Freezing level	Above summits.

Outlook

Tuesday

Still rather windy on Tuesday with a chance of southerly or southwesterly gales around the summits. It should be mainly dry though with some sunshine and the main risk of rain coming late in the day.

Wednesday

Wednesday is likely to be a cloudier, wetter day than Tuesday as a band of rain spreads across the area. It will be windy at first but winds should ease during the day.

Thursday

The weather remains unsettled on Thursday, with outbreaks of rain expected and a strengthening south to southeasterly wind. Low cloud and hill fog are likely and there is a chance of the rain becoming heavy at times.