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Weather hazards over 300m on Fri 27 Nov 2015

High risk

Gusts of 55mph likely by the afternoon
Persistent extensive hill fog
Extensive above 400 metres leading to navigational difficulties.

Medium risk

Severe chill effect
Strong winds and heavy rain combining to give a significant chill effect.

Low risk

Heavy snow
Showers overnight will fall as snow.
Heavy persistent rain
Rain will turn heavy for a time through the afternoon.

No risk

Storm force winds
Strong sunlight

Fri 27 Nov 2015

Cloudy through the morning, with extensive hill fog and outbreaks of rain or drizzle. During the afternoon, rain will become heavy for a time before clearing by evening, possibly turning to snow over the summits briefly as it clears. Colder, clearer conditions will follow, with isolated showers, falling as snow above around 600 metres. Strong winds will accentuate the cold feel.

0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Drizzle Light rain Heavy rain Sleet Light shower night Light shower night
Precipitation probability
80% 80% 90% 70% 40% 20%


Moderate or poor in rain, becoming very good later in the evening. Very poor in hill fog and snow showers.

Hill Fog

Extensive down to 300 metres through the morning, with patches down to 200 metres on west facing slopes, becoming isolated above 400 metres through the afternoon.

Max wind above 500m

Southwest 55mph.


Plus 7 rising to plus 10 Celsius.
Plus 7 falling to minus 2 Celsius later.
Freezing level:
Above the summits, falling to 700 metres through the evening.

Ground conditions

Latest: Date of observations: 25 Nov 2015 Observation made on: Snowdon Time of observation: 11:30 Winter conditions above: 900 Ground Conditions: Isolated patches of snow. Observations on: Observation Text: Kit Advice: Wear sturdy walking boots. Take waterproofs, hat, gloves and spare warm layers.

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:
Forum discussions on the latest Winter Conditions:
The Met Office is not responsible for the content of external sites.

Sat 28 Nov 2015

Despite some clear spells overnight, it will be a generally cloudy day with outbreaks of heavy rain spreading from the west through the morning. Further showers will follow on behind during the afternoon. These showers will be heavy at times and falling as snow over the summits. Remaining very windy with gales, making it feel bitterly cold with severe wind-chill.


Initially very good, becoming moderate to poor in rain. Very poor in hill fog and snow showers.

Hill Fog

Isolated patches down to 500 metres, becoming occasional in rain.

Max wind above 500m

Southwesterly 60mph.


Plus 1 Celsius rising to plus 8 Celsius
Minus 2 Celsius rising to plus 1 Celsius.
Freezing level:
600 metres, rising above the summits by day.

Sun 29 Nov 2015

The unsettled, showery conditions will continue, the showers again wintry at first over higher ground. There will be some bright spells likely through the day, but further persistent rain arriving overnight Windy with gales in many places. Freezing levels 700 metres, rising above the summits.

Mon 30 Nov 2015

Remaining very windy with gales continuing. The area is expected to lie on the boundary between cloud and rain to the south and colder, drier conditions in the north, with the latter slightly more likely at present. Freezing levels above the summits.

Tue 01 Dec 2015

Some drier spells are possible overnight, with winds easing, but the rain will soon return, along with very strong winds. Freezing levels remaining above the summits.

Issued at: 0343 on Fri 27 Nov 2015