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Snowdonia

Weather hazards over 300m on Wed 07 Dec 2016

High risk

Gales
Considerable buffeting likely over exposed ridges.

Medium risk

Persistent extensive hill fog
Significantly reduced visibility at times.

Low risk

Storm force winds
Risk of losing one's footing in gusts.
Heavy persistent rain
Reduced visibility with risk of slipping on wet rocks.

No risk

Blizzards
none
Heavy snow
none
Severe chill effect
none
Thunderstorms
none
Strong sunlight
none

Wed 07 Dec 2016

Gale force winds through the day over the summits with hill fog above 300 to 400m through the day and overnight. Possible drizzle at first, but the rain is likely to become persistent and occasionally heavy from the afternoon onwards.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Cloudy Cloudy Light shower day Light rain Light rain Heavy rain
Precipitation probability
0% 30% 40% 80% 80% 80%

Visibility

Very poor in hill fog, locally moderate to good under cloud. Poor in rain later.

Hill Fog

Broken or blanket cover above 300m through the day.

Max wind above 500m

Southwesterly strong to gale 55mph with possible sustained winds of 65-70mph over expsoed peaks and ridges.

Temperature

Valleys:
Plus 8 becoming 13 Celsius.
800m:
Plus 9 Celsius.
Freezing level:
Above the summits.

Ground conditions

Area - Snowdon Date - 4 December 2016 Time - 12.00pm Snow Above - 850m Report By - Snowdon Warden Route Taken: Llanberis Path. Conditions: Isolated stretches of snow. Depth of snow increases with altitude. Snow compacted and frozen on paths making conditions very slippery underfoot Kit Advice The following is a list of additional kit required based on the current conditions: Ice axe and crampons recommended. Wear crampon compatible boots. Take waterproofs, hat, gloves and spare warm layers. Additional Information: It felt very cold in the strong wind

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.

Thu 08 Dec 2016

Overcast with hill fog and rain through the morning which may be heavy at times. Becoming dry into the afternoon with hill fog starting to break up.

Visibility

Very poor in hill fog, locally moderate in rain becoming good later.

Hill Fog

Blanket above 300m at first, becoming well broken above 500m by mid-afternoon.

Max wind above 500m

Southwesterly 30mph at first, easing rapidly.

Temperature

Valleys:
Plus 8 becoming 13 Celsius.
800m:
Plus 6 Celsius
Freezing level:
Above the summits.

Fri 09 Dec 2016

Another cloudy day and mild day with patchy rain in the morning becoming more persistent through the afternoon. Widespread hill fog again, although not as extensive or low as Thursday. Freezing level remaining well above the summits and strong to gale force southwest winds.

Sat 10 Dec 2016

A bright day with sunny spells and showers. Winds lighter than previous days but still a fresh westerly.

Sun 11 Dec 2016

A breezy but dry day with good sunny spells. Although it will be cooler than the last few days the freezing level will remain just above the summits.

Issued at: 0850 on Wed 07 Dec 2016

Due to essential maintenance work on 7 December 2016 you may experience some disruption to services through the Met Office web site. This is most likely to occur between 1000 and 1200. We are sorry for any inconvenience this may cause.