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Snowdonia

Weather hazards over 300m on Mon 20 Feb 2017

High risk

Persistent extensive hill fog
Hill generally shrouded above 400m, with patches down to sea-level in the west.

Medium risk

Gales
Turning windy, with isolated gales possible across highest summits and ridges.

Low risk

Heavy persistent rain
Persistent rain or drizzle. Slippery paths and rocks likely, with waterproofs essential.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Severe chill effect
none
Thunderstorms
none
Strong sunlight
none

Mon 20 Feb 2017

A dull start, with most hills shrouded in fog and outbreaks of rain or drizzle, persistent across the tops. A brief brighter interlude is possible in the middle of the day, but it will remain damp and grey for most, with poor visibilities. Despite mild temperatures cloudy skies and occasional rain will lead to a cool feel. Winds will also be strong, especially during the afternoon.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Cloudy Cloudy Drizzle Drizzle Cloudy Heavy rain
Precipitation probability
30% 30% 60% 40% 30% 70%

Visibility

Moderate to poor for much of the day, and very poor in hill fog.

Hill Fog

Widespread above 400m throughout, although some breaks possible around the middle of the day. Ragged patches down to 100m in the west, mainly during rain or drizzle.

Max wind above 500m

Westerly 30-40mph, but gusts 50-55mph possible during the afternoon.

Temperature

Valleys:
Plus 8 Celsius becoming Plus 12 Celsius
800m:
Plus 5 Celsius
Freezing level:
Well above the summits.

Ground conditions

Area - Snowdon. Date - 19 February 2017. Time - 12.30pm. Snow Above - 950metres. Report By - Jon Elliott. Route Taken: Penypass to Lliwedd. Watkin to Snowdon. Descend Miners track. Conditions: Isolated patches of snow. No adverse ground conditions observed by the National Park Wardens. Thawing at all levels. Paths clear. Kit Advice: The following is a list of additional kit required based on the current conditions. Wear sturdy walking boots. Take waterproofs, hat, gloves and spare warm layers. Additional Information: Nil.

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.

Tue 21 Feb 2017

Another damp, and grey day is expected with strong westerly winds bringing low cloud and outbreaks of rain. These are likely to turn persistent and perhaps heavier later in the day, with hill fog lowering to cover lower hills.

Visibility

Moderate to poor, and very poor in hill fog.

Hill Fog

Widespread above 400m throughout. Ragged patches down to 100m in the west, mainly during rain or drizzle during the afternoon.

Max wind above 500m

Southwesterly 25-30 with gusts 40mph, increasing to westerly 30-35 with gusts 50mph into the evening

Temperature

Valleys:
Plus 8 becoming Plus 13 Celsius.
800m:
Plus 4 Celsius.
Freezing level:
Above the summits.

Wed 22 Feb 2017

After a cloudy start, clearer conditions will gradually sink south with fresher and clearer conditions following for a brief period. During this, it will turn cooler, with freezing levels falling to 800m. However it will also turn drier, with lighter winds and sunnier skies.

Thu 23 Feb 2017

Midler, cloudier and damper conditions are expected to return overnight, with winds also increasing by Thursday morning. Gales are likely across the tops, along with hill fog and the freezing level rising above the summits. However this is expected to clear through the afternoon, leading to another freeze overnight, as freezing levels fall to 600m by midnight.

Fri 24 Feb 2017

A cold start, with the risk of verglas (thin ice) across paths and rocks, as freezing levels fall to around 400m by dawn. However cloud will gradually thicken from the west through Friday, with milder temperatures possible by dusk leading to freezing levels rising above the tops. This will bring a further risk of hill fog, and outbreaks of rain later in the day.

Issued at: 0340 on Mon 20 Feb 2017