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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Mon 24 Apr 2017

High risk

No high risks
none

Medium risk

No medium risks
none

Low risk

Severe chill effect
A risk of significant chill effects in the afternoon in strong winds, cold temperatures.
Persistent extensive hill fog
Periods of hill fog give a risk of navigational difficulties.

No risk

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

Mon 24 Apr 2017

Turning cloudy overnight with occasional outbreaks of rain, continuing into the morning. During the late morning and early afternoon a band of rain will move south, bringing much colder conditions. This turning to sleet and snow above 600 metres, before becoming mostly dry through the evening with just isolated showers, again of sleet or snow on high ground.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Light rain Light rain Heavy rain Sleet Light snow shower day Partly cloudy night
Precipitation probability
60% 60% 70% 60% 30% 20%

Visibility

Generally very good, although moderate or poor in rain and very poor in hill fog and snow.

Hill Fog

Periods of hill fog above 400 metres arriving late in the night with ragged patches down to 200 metres. This lifting a little through the morning, although occasional patches above 400 metres continuing through the day.

Max wind above 500m

Northwesterly 40 mph.

Temperature

Valleys:
Plus 4 Celsius rising to plus 11 Celsius.
800m:
Plus 4 Celsius falling to minus 4 Celsius.
Freezing level:
Around the summits falling to 800 metres in the afternoon and 400 metres by the evening.

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.

Tue 25 Apr 2017

Sometimes dry with a risk of frost at low levels overnight. Scattered showers developing early in the morning, turning heavy and potentially thundery in the afternoon. Showers are likely to be of sleet and snow above 200 metres with moderate accumulations likely. Snow may fall fleetingly to lower levels at times too. Cold with a brisk northwesterly wind. Occasional showers continuing into the night.

Visibility

Very good or excellent, but moderate or poor in showers and very poor in snow and hill fog.

Hill Fog

Occasional hill fog above 500 metres associated with showers.

Max wind above 500m

Northwesterly 40 mph.

Temperature

Valleys:
Minus 1 Celsius rising to plus 9 Celsius.
800m:
Minus 3 Celsius.
Freezing level:
500 metres.

Wed 26 Apr 2017

Another cold, windy and showery day with a risk of isolated thunderstorms. The showers will be heavy at times giving sleet and snow at higher levels with a risk of further accumulations with the freezing level around 500 metres.

Thu 27 Apr 2017

An early frost likely. It will turn a little milder with freezing levels slowly rising above the summits. Showers and outbreaks of rain will develop again through the day giving sleet or snow at high levels initially, although this gradually turning to rain. Winds easing.

Fri 28 Apr 2017

Mostly dry through the morning although rather cloudy. Later in the day strong winds and rain will spread in from the west.

Issued at: 0424 on Mon 24 Apr 2017