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Snowdonia

Weather hazards over 300m on Fri 29 Apr 2016

High risk

No high risks
none

Medium risk

Severe chill effect
Increasing risk of hypothermia on the highest peaks unless adequately protected.
Persistent extensive hill fog
Risk of navigation difficulties on higher peaks through the morning.

Low risk

Blizzards
Frequent snow showers and strong winds may lead to some disorientation.
Gales
Gusts of 45mph will produce considerable buffeting in exposure.
Thunderstorms
Low risk of thundery showers through the morning and afternoon.
Strong sunlight
Possible moderate UV levels at times in the afternoon, and some glare off snowpack.

No risk

Heavy snow
none
Storm force winds
none
Heavy persistent rain
none

Fri 29 Apr 2016

A very cold day and cloudy to start with frequent showers until mid morning, wintry at times down to low levels. After this the day should see some bright or sunny intervals, but with further showers, these likely to stay wintry above 500m. Becoming dry in the evening with clear spells. Significant wind chill expected especially across the summits until the winds easing through the evening.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Sleet shower day Sleet shower day Sleet shower day Sleet shower day Sleet shower night Sleet shower night
Precipitation probability
50-70% 50-70% 30-50% 10-30% 20% 20%

Visibility

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

Hill Fog

Well broken or broken 500-600m in any heavier showers.

Max wind above 500m

West to northwesterly 45mph easing to gusts of 30mph by late afternoon.

Temperature

Valleys:
Zero becoming Plus 10 Celsius.
800m:
Minus 3 Celsius.
Freezing level:
To low levels early in the day, rising to 600m in the afternoon.

Ground conditions

Latest: Date of observations: 27/04/2016 Observation made on: Yr Wyddfa - Snowdon Time of observation: 1:00 PM Winter conditions above: 350m Ground Conditions: Slopes and paths covered in snow. Observations on: N/A Observation: G & Snowdon Ranger Paths - Cover of snow was pretty consistent across the higher parts of the mountain. On major paths, particularly on PyG, Llanberis and Miners the snow has been compacted making conditions very slippery underfoot. Kit Advice: Recommended to carry ice axe and crampons, Wear crampon compatible boots, Walking poles can provide an aid to balance and security when walking through unconsolidated snow, Take waterproofs, hat, gloves and spare warm layers Further Advice: N/A

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.

Sat 30 Apr 2016

Largely dry and bright to start on Saturday with just a few showers likely through the day, though these are only likely to be wintry above 700-800m. Turning dry by the evening with more in the way of sunshine developing. Remaining very cold for the time of year.

Visibility

Generally very good or excellent, though moderate to poor in showers.

Hill Fog

Scattered to broken above 700m in showers

Max wind above 500m

Northwesterly 20-30mph.

Temperature

Valleys:
Plus 1 becoming 10 Celsius.
800m:
Minus 3 becoming zero Celsius.
Freezing level:
700m rising to 900m through the day.

Sun 01 May 2016

Turning windy on Sunday with gales expected to develop across the tops, The freezing levels will rise above the tops of all peaks as rain pushes in from the west through the morning leading to a wet afternoon, with some persistent hill fog developing in the rain.

Mon 02 May 2016

Rain will clear through Monday leaving an afternoon of sunshine and blustery showers with freezing levels returning to near mountain tops. Winds will turn northwesterly and ease slightly. Strong winds will continue overnight into Tuesday.

Tue 03 May 2016

Sunny spells and gusty showers through Tuesday, some of these are likely to be heavy with a low risk of hail and thunder. Remaining on the cold side across the summits.

Issued at: 0403 on Fri 29 Apr 2016