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Snowdonia

Weather hazards over 300m on Tue 29 Jul 2014

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Cloud as low as 400m on passage of a weak front, bringing patchy rain.
Strong sunlight
Sunny spells later with moderate to high UV levels.

Low risk

No low risks
none

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Severe chill effect
none
Thunderstorms
none
Heavy persistent rain
none

Tue 29 Jul 2014

It will be generally cloudy this morning as a weak weather front approaches from the northwest. The front will bring patchy, mainly light, rain and cloud bases as low as 400m at times through the middle of the day. It will tend to brighten up later in the day with some sunny spells possible. It will be cooler than of late in a moderate northwesterly breeze.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Cloudy Light rain Light rain Sunny intervals Sunny intervals Partly cloudy night
Precipitation probability
20% 70% 60% 20% 10% 0%

Visibility

Generally good, moderate in rain, and very poor in hill fog.

Hill Fog

Cloud bases as low as 400m at times, mainly through the middle of the day.

Max wind above 500m

Northwest 14-18mph.

Temperature

Valleys:
Plus 10 Celsius increasing plus 17 Celsius.
800m:
Plus 9 Celsius increasing plus 11 Celsius.
Freezing level:
Above the summits.

Issued at: 0419 on Tue 29 Jul 2014

Wed 30 Jul 2014

A generally day and bright day, but turning cloudy at times. Cloud could be as low as 500m at times and possibly thick enough to produce the odd spot of drizzle on northwestern slopes. Winds remaing mainly moderate westerly. Temperatures about normal for the time of year, but feeling much cooler than of late.

Visibility

Generally good or very good, moderate or poor in drizzle, very poor in hill fog.

Hill Fog

Cloud bases as low as 500m at times throughout the day.

Max wind above 500m

Westerly 15-20mph.

Temperature

Valleys:
Plus 12 Celsius increasing plus 18 Celsius.
800m:
Plus 10 Celsius.
Freezing level:
Above the summits.

Issued at: 0419 on Tue 29 Jul 2014

Thu 31 Jul 2014

A generally dry day with sunny spells and isolated showers. It will feel warm, particularly in the afternoon sun. Winds remaining from the west.

Issued at: 0419 on Tue 29 Jul 2014

Fri 01 Aug 2014

A generally dry and bright start, but showers will develop through the day, these will be heavy and possibly thundery at times and more frequent than on Thursday. Gusty winds in the showers.

Issued at: 0419 on Tue 29 Jul 2014

Sat 02 Aug 2014

Cloudy with patchy rain at first, bringing hill fog mainly to western slopes. Clearing through the morning to become mainly dry with sunny spells, but scattered showers possibly developing through the afternoon.

Issued at: 0419 on Tue 29 Jul 2014