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Snowdonia

Weather hazards over 300m on Sat 01 Aug 2015

High risk

No high risks
none

Medium risk

No medium risks
none

Low risk

Strong sunlight
Risk of sunburn in any prolonged sunny spells in the afternoon.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Severe chill effect
none
Persistent extensive hill fog
none
Thunderstorms
none
Heavy persistent rain
none

Sat 01 Aug 2015

Cloudy with outbreaks of rain during the early hours of Saturday, rain should be mainly light but some heavier outbreaks are possible. Rain should begin to ease during the morning after dawn, becoming dry by lunchtime, with some brighter or sunny spells developing during the afternoon. A few further spots of rain are possible in the late evening. Areas of hill fog will accompany the rain in the morning, with further areas developing again in the evening.

Time
0000 to 0300 0300 to 0600 0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Light rain Light rain Light rain Light rain Sunny intervals Sunny intervals Sunny intervals Light rain
Precipitation probability
80% 60% 60% 40% 0% 0% 20% 60%

Visibility

Mainly good, but moderate in any heavier rain.

Hill Fog

Broken above 500 metres during the morning, clearing by lunchtime, but returning again in the evening broken above 400 metres.

Max wind above 500m

Southwesterly 20-25mph.

Temperature

Valleys:
Plus 8 becoming 18 Celsius.
800m:
Plus 8 Celsius.
Freezing level:
Above the highest summits.

Sun 02 Aug 2015

Cloudy overnight with a few further outbreaks of light rain at times, but becoming dry shortly after dawn, followed by a dry and cloudy morning. Brightening up from late morning onwards with some sunny spells developing, and feeling a bit warmer than recent days. Southerly breezes will gradually increase during the day.

Visibility

Good, perhaps very good in the afternoon.

Hill Fog

Broken above 500 metres in the early hours, clearing a few hours after sunrise.

Max wind above 500m

Southerly 20mph at first, gradually becoming southerly 35mph by evening.

Temperature

Valleys:
Plus 10 becoming 23 Celsius.
800m:
Plus 8 Celsius becoming plus 11 Celsius.
Freezing level:
Above the highest summits.

Mon 03 Aug 2015

Turning very unsettled, with strong southerly winds and heavy rain through the morning and into the afternoon, becoming drier later in the day but remaining windy. Some thundery downpours are possible within the rain band, and winds may reach gale force on higher ground.

Tue 04 Aug 2015

A breezy day with brisk westerly winds, and a mix of sunshine and blustery showers throughout the day. Winds easing later in the day.

Wed 05 Aug 2015

Rather cloudy for much of the day, and continuing breezy, with a mix of showers and longer spells of rain.

Issued at: 1624 on Fri 31 Jul 2015