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Snowdonia mountain area forecast

Sunday, 8 November 2009: dawn to dusk

Forecast issued: 0256 on Sunday, 8 November 2009

Latest pressure

Updated: 1023 on Sun 8 Nov 2009

Digital Map Data:
© Collins Bartholomew Ltd (2006)

Overview for Sunday

It will be a rather cloudy and misty morning with some scattered showers at first, but becoming brighter later and mainly dry.

Hazards	Risk	Explanation
Blizzards	No Risk
Heavy snow	No Risk
Storm force winds	No Risk
Gales	No Risk
Severe chill effect	No Risk
Persistent and extensive hill fog	Medium	Hill fog will be widespread and persistent at times during the morning.
Thunderstorms	Low	Low risk of lightning in showers during the morning.
Heavy persistent rain	Low	Rain may be persistent at first during the morning, mostly light but locally heavy.

Hazards

Risk

Explanation

Blizzards

No Risk

Heavy snow

No Risk

Storm force winds

No Risk

Gales

No Risk

Severe chill effect

No Risk

Persistent and extensive hill fog

Medium

Hill fog will be widespread and persistent at times during the morning.

Thunderstorms

Low

Low risk of lightning in showers during the morning.

Heavy persistent rain

Low

Rain may be persistent at first during the morning, mostly light but locally heavy.

Weather summary and probability of precipitation for Sunday
Dawn to 0900	0900 to 1200	1200 to 1500	1500 to dusk
Light rain showers	Light rain showers	Light rain showers	Light rain showers
70%	60%	30%	10%

Weather summary and probability of precipitation for Sunday

Dawn to 0900

0900 to 1200

1200 to 1500

1500 to dusk

Light rain showers

70%

60%

30%

10%

Detailed mountain weather forecast: Snowdonia

Sunday
Monday
Outlook

Sunday

Weather

It will be a mainly cloudy and quite misty morning with occasional showers or periods of mainly light rain. Some heavier showers are possible at first. There is a low risk of lightning in heavier showers during the morning. However, conditions should brighten up later in the day with only isolated showers.

Visibility

The visibility will be generally moderate at first in mist and rain or showers, and poor in hill fog. Generally moderate or good during the afternoon.

Hill fog

Hill fog will be widespread at first with cloud bases around 500 to 600 metres. Conditions will improve later with cloud bases rising to 700 to 800 metres with only patchy hill fog on the peaks.

Maximum winds above 500m

Winds northerly speeds 20 to 25 mph with gusts to 40 mph, easing 15 to 20 mph this afternoon

Temperature

Valleys	Plus 5 becoming 10 Celsius
900 m	Plus 2 Celsius
Freezing level	The freezing level will be above the tops.

Monday

Weather

It will be a misty start with some valley mist and fog patches and some low cloud on upslopes. Some bright spells may break through during the middle of the day. Cloud will increase through the afternoon with rain arriving in the west by around dusk.

Visibility

The visibility will be moderate in mist at first and poor in valley and hill fog. Becoming moderate or good for much of the afternoon period.

Hill fog

Hill fog will be widespread at first with low cloud on hills around 300 to 500 metres. Cloud bases lifting to 700 to 800 metres by midday with only patchy hill fog. Cloud bases may lower to 600 metres as the rain arrives around dusk.

Maximum winds above 500m

Winds light or moderate northerly speeds 15 to 20 mph, becoming moderate southerly later speeds 20 to 25 mph.

Temperature

Valleys	Plus 3 becoming 10 Celsius
900 m	Plus 3 becoming 5 Celsius
Freezing level	The freezing level will be above the tops.

Outlook

Tuesday

Cloudy with heavy rain at first and widespread hill fog, then becoming brighter and drier with cloud lifting and break. Winds brisk southerly at first, veering northwesterly later and moderating.

Wednesday

Dry at first with a ground frost and mist and valley fog. Bright for a time, then cloud will increase with rain spreading from the south during the afternoon. Hill fog will become more widespread. Winds light at first, strengthening from the southeast later.

Thursday

Rain and low cloud will clear during the morning, then brighter with scattered showers during the afternoon. Winds strong southerly at first, then lighter westerly.