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Updated: 1521 on Wed 18 Jun 2014
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Snowdonia: latest pressure

Monday, 28 July 2014: dawn to dusk

Printable view Forecast issued: 0347 on Monday, 28 July 2014

Overview for Monday

Scattered showers this morning. Showers becoming very isolated this afternoon with increasing amounts of sunshine.

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 No Risk  
Thunderstorms Low A low risk of thundery showers at first.
Heavy persistent rain No Risk  
Strong Sunlight Medium Sunny spells give a risk of sunburn.

key to hazards and forecast content

Weather summary and probability of precipitation for Monday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
Heavy rain showers
Heavy rain showers
Light rain showers
Light rain showers
Sunny intervals
Sunny intervals
Sunny intervals
Sunny intervals
60% 40% 30% 20%

Detailed mountain weather forecast: Snowdonia

Monday

Weather

Rather cloudy with scattered showers and isolated heavy showers, perhaps with a risk of thunder for a time this morning. Sunny spells should develop through the day, but the risk of scattered showers will continue, becoming more isolated during the afternoon. Showers should ease during the evening, leaving clear spells.

Visibility

Moderate or poor in outbreaks of rain at first. Improving to very good in the morning, but moderate or poor in any heavy showers through the day.

Hill fog

Extensive hill fog above 500-700 metres at first but perhaps down to 300 metres on the Snowdon Range and north of the A5. Cloud bases slowly rising to around or just above the summits in southern parts of the park, but persisting above around 900m across some northern ranges well into the afternoon.

Maximum winds above 500m

Northerly 15-20 mph.

Temperature

Valleys Plus 10 Celsius rising to plus 20 Celsius.
900 m Plus 10 Celsius.
Freezing level Above the summits.

Tuesday

Weather

It will be a dry start, although with some mist patches possible in the valleys. Some sunshine in southern and eastern parts of the park for a time, but cloud lowering further north and west with outbreaks of drizzly rain developing on the Snowdon Range and around Porthmadog. Staying dry further east towards Bala with bright periods and probably remaining dry until dusk in these areas of the park.

Visibility

Generally very good, but occasionally poor in the rain and drizzle and very poor in hill fog.

Hill fog

Just the odd patch above 800m at first, but cloud bases gradually lowering through the morning with occasional hill fog above 400m developing by the middle of the day, especially in the west.

Maximum winds above 500m

Northwesterly 25 mph.

Temperature

Valleys Plus 10 Celsius rising to plus 20 Celsius.
900 m Plus 11 Celsius.
Freezing level Above the summits.

Outlook

Wednesday

Variable cloud with some sunny spells. It should stay largely dry, although there may be a few isolated showers through the day. A moderate west or northwesterly breeze. Temperatures remaining similar, and feeling warm in bright spells.

Thursday

More in the way of cloud than previous days, with occasional showers through the day, although these generally light. Moderate westerly winds.

Friday

Largely cloudy with scattered showers which may turn moderately heavy at times. Southwesterly winds becoming fresh through the afternoon.

Observations

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Weather warnings for Wales

Weather forecast for Wales

The Enhanced Mountain forecast for Snowdonia has been discontinued. All forecast information for these locations can be found in the standard Mountain forecast above.

North East England West Midlands Grampian South West England Central, Tayside & Fife Northern Ireland North West England East of England Highlands & Eilean Siar Strathclyde Wales East Midlands SW Scotland, Lothian Borders London & South East England Yorkshire & Humber

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