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Snowdonia

Weather hazards over 300m on Tue 28 Apr 2015

High risk

Gales
Considerable buffeting likely at times over higher routes.

Medium risk

Severe chill effect
Risk of hypothermia and frostbite on higher peaks unless adequately protected.

Low risk

Persistent extensive hill fog
Temporary navigation difficulties expected along higher routes.
Thunderstorms
Isolated lightning strikes possible in heavy showers, especially on exposed tops and ridges.
Strong sunlight
Moderate UV levels possible at times in any prolonged cloud breaks.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Heavy persistent rain
none

Tue 28 Apr 2015

Mainly dry in the early hours, with just the chance of an isolated shower. Tuesday should see some bright or sunny intervals, but with the continuing risk of scattered shower. Showers may be heavy with isolated thunderstorms possible, and wintry on the hills, but with the snow level rising from 400-500m to 600m during the day. Showers are likely to merge to give more persistent precipitation by late evening. Icy at times underfoot at elevation,

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
Partly cloudy night Partly cloudy night Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sleet shower day Sleet shower night
Precipitation probability
20% 20% 30% 40% 40% 40% 60% 80%

Visibility

Very good or excellent, becoming moderate or poor at times in showers, and very poor in hill fog.

Hill Fog

Broken at times above 600m, especially in showers.

Max wind above 500m

Westerly 35 gust 45 mph, becoming southwesterly 40 gust 55 mph by evening.

Temperature

Valleys:
Plus 3 becoming Plus 11 Celsius
800m:
Minus 2 Celsius
Freezing level:
600m rising to 700m

Ground conditions

There is no recent report of the ground conditions available from the National Park Wardens.

This report is completed on a regular basis through the winter months by Snowdonia National Park Wardens and gives indicative information on snow/ice conditions underfoot in the Snowdonia area as a whole. Remember mountains can be inhospitable and dangerous places for the ill-prepared so it is important to check the forecast before setting out.

Further information:
Live information on Winter Conditions in Cwm Idwal: https://www.thebmc.co.uk/idwal
Forum discussions on the latest Winter Conditions: http://www.ukhillwalking.com/forums/i.php?f=7
The Met Office is not responsible for the content of external sites.

Issued at: 1822 on Mon 27 Apr 2015

Wed 29 Apr 2015

Another day of bright or sunny intervals and scattered showers, these perhaps wintry at times above 600m, but likely to be lighter than on Tuesday. Ground likely to remain frozen at highest elevations giving some difficult conditions underfoot.

Visibility

Very good or excellent, becoming moderate at times in showers, and very poor in any hill fog.

Hill Fog

Broken at times above 500m, mainly in showers.

Max wind above 500m

Westerly 30 gust 40 mph

Temperature

Valleys:
Plus 3 becoming Plus 11 Celsius
800m:
Minus 1 Celsius
Freezing level:
700m

Issued at: 1822 on Mon 27 Apr 2015

Thu 30 Apr 2015

Bright or sunny intervals and scattered showers, perhaps heavy and thundery, and falling as snow over highest ground. Winds becoming moderate or fresh northerly on the hills.

Issued at: 1822 on Mon 27 Apr 2015

Fri 01 May 2015

Dry with some sunny spells after a cold start. Light to moderate winds over the hills, rather variable in direction.

Issued at: 1822 on Mon 27 Apr 2015

Sat 02 May 2015

Some uncertainty, but expected to be increasingly cloudy. with some rain likely to spread from the southwest by afternoon. Winds on the hills expected to strengthen from the southeast during the day.

Issued at: 1822 on Mon 27 Apr 2015