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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Tue 24 Jan 2017

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Low confidence, however early low level mist lifting, more persistent base around 600m later.

Low risk

Severe chill effect
Brisk southwesterly winds at height will make already low temperatures feel still colder.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Thunderstorms
none
Heavy persistent rain
none
Strong sunlight
none

Tue 24 Jan 2017

Clear spells overnight are likely to lead to a frost and some low level mist at first this morning, mainly in the east where it will perhaps be locally freezing fog. This should lift through the morning, perhaps giving some limited sunny intervals for a time, however a more persistent cloud base around 600 metres should then see out the day. Becoming breezy at height through the day, leading to windchill, which will be exacerbated when taken with the chance of intermittent light rain that should see out the day.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Mist Sunny intervals Cloudy Light rain Cloudy Light rain
Precipitation probability
0% 0% 0% 30% 20% 30%

Visibility

Locally poor to start, improving good through the morning.

Hill Fog

Relatively low confidence, some early low-level mist may lift to give hill fog around 300m for a time, with a more persistent base likely around 600m later.

Max wind above 500m

Southwesterly 35mph.

Temperature

Valleys:
Minus 3 becoming 7 Celsius.
800m:
Plus 1 becoming 2 Celsius.
Freezing level:
1000m, rising clear before onset of rain.

Ground conditions

Latest:Area - Snowdon (also notes from Cadair Idris) Date - 22 January 2017 Time - 12.30pm Snow Above - 400m Report By - Snowdon Warden Route Taken - Watkin Path and down by PyG Track Conditions -Isolated stretches of snow. -Light dusting of hail or snow. -Wet surfaces are coated in ice. -Heavy frost cover on rocks and vegitation. -All surfaces very slippery, especially above 750m 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. -Wear sturdy walking boots. -Take waterproofs, hat, gloves and spare warm layers. Additional Information Cadair Idris - light dusting of new snow above 400m - paths slippery

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.

Wed 25 Jan 2017

Brighter than on Tuesday, with a cloud layer around 600 metres readily breaking. Despite sunny spells, it will remain cold, with windchill significant in the near gale force wind at height. It should stay dry throughout.

Visibility

Good or very good.

Hill Fog

Well-broken around 600 metres.

Max wind above 500m

Southwest, later southeasterly 40mph.

Temperature

Valleys:
Minus 2 becoming plus 5 Celsius.
800m:
Plus 1 becoming 3 Celsius, but note sub-zero layer developing below this.
Freezing level:
Sub zero layer gradually descending, from near summits to between 300 and 700m later.

Thu 26 Jan 2017

Similar conditions to Wednesday: dry and bright with some sunshine, but with a strong southeasterly wind at height that is likely to consistently exceed gale force, leading to a considerable wind chill. A sub-zero layer between around 300 and 700 metres should warm out later.

Fri 27 Jan 2017

While the wind should ease on Friday, cloud-cover is likely to become more extensive, perhaps resulting in a little rain at times. Strong southeasterly winds should ease southwesterly later, while the freezing level should remain clear of the summits.

Sat 28 Jan 2017

Rather cloudy conditions are likely on Saturday, with some low level mistiness likely as the wind potentially falls light. There is a chance that the high peaks may just stand clear of this later, although confidence at this range is low. The freezing level should approach the summits.

Issued at: 0359 on Tue 24 Jan 2017