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Snowdonia mountain area forecast

Forecast issued: 1436 on Wednesday, 30 July 2014

Overview for Thursday

Cloudy with patchy light rain, becoming brighter with showers.

Hazards

Low risk of Persistent extensive hill fog: Extensive above 500m at first, patchy in showers later. Mainly on western slopes.

Low risk of Thunderstorms: Low risk of thundery showers through the afternoon.

Low risk of Strong sunlight: Moderate to high UV levels in sunny spells.

No risk of Blizzards; Heavy snow; Storm force winds; Gales; Severe chill effect; Heavy persistent rain;

Weather summary and probability of precipitation for Thursday

Dawn to 0900 Cloudy Cloudy 10% chance of precipitation
0900 to 1200 Cloudy Cloudy 10% chance of precipitation
1200 to 1500 Cloudy Cloudy 20% chance of precipitation
1500 to dusk Sunny intervals Sunny intervals 20% chance of precipitation

Detailed mountain weather forecast

Thursday

Weather

A cloudy start with extensive hill fog above 500m, particularly on western slopes, and some patchy light rain or drizzle. Cloud will gradually lift and break through the morning to bring some sunny spells, but showers are likely to develop through the afternoon. Showers could be heavy with a risk of thunder at times. Winds southwesterly light to moderate throughout and feeling warm in any sunny spells.

Visibility

Excellent, moderate in rain, poor in drizzle and very poor in hill fog.

Hill fog

Extensive above 500m at first, becoming patchy and related to showers later, mainly on western slopes.

Maximum winds above 500m

West to southwesterly 15-20mph, isolated 25mph.

Temperature

Valleys: Plus 14 Celsius increasing plus 21 Celsius.
900 m: Plus 10 Celsius.
Freezing level: Above the summits.

Friday

Weather

A generally cloudy day with light showery rain and brighter spells at first. Cloud will increase throughout the day as more persistent and heavier rain approaches from the southwest, brining extensive low cloud and hill fog as low as 400m later in the day. Winds moderate southwesterly.

Visibility

Good, moderate in rain, poor in heavy rain, very poor in hill fog.

Hill fog

Becoming extensive above 400m later in the day, mainly on western slopes.

Maximum winds above 500m

Southwesterly 18-23mph.

Temperature

Valleys: Plus 14 Celsius increasing plus 20 Celsius.
900 m: Plus 10 Celsius.
Freezing level: Above the summits.

Outlook

Saturday

Rain, heavy at times, and associated hill fog will gradually clear the range through the latter part of the day. Sunny spells and isolated showers will then follow.

Sunday

A much drier day than Saturday. There will be a mixture of sunshine and showers throughout the day. It will be breezy, but fell warm in any sunny spells when walking out of the wind.

Monday

Another day of sunshine and showers, but winds will be lighter than on Sunday. Feeling warm again in the sunshine, but tending to cloud over more later in the day.


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