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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Sun 23 Nov 2014

High risk

No high risks
none

Medium risk

No medium risks
none

Low risk

Severe chill effect
A northwesterly wind and freezing summits will make it feel like -5 Celsius.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Persistent extensive hill fog
none
Thunderstorms
none
Heavy persistent rain
none
Strong sunlight
none

Sun 23 Nov 2014

A cloudy and rather chilly start, however, through the morning skies will increasingly brighten from the northwest as high level cloud clears to the southeast. This will lead to a fine afternoon across the park with plenty of autumnal sunshine and light winds, giving pleasant walking conditions, despite the cold temperatures at height. Temperatures will fall sharply through the evening with a frost forming and some valley fog patches developing.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Cloudy Sunny intervals Sunny intervals Sunny day Clear night Partly cloudy night
Precipitation probability
0% 0% 0% 0% 0% 0%

Visibility

Generally very good or excellent with distant hills clearly discernible. However, visibilities will be very poor where shrouded in any patches of low cloud during the morning.

Hill Fog

Patches of low cloud possible across lower slopes during the morning, these mainly across western upslopes. Otherwise, hills will be largely free of cloud.

Max wind above 500m

Northwesterly 15-20 mph.

Temperature

Valleys:
Plus 3 becoming 10 Celsius.
800m:
Plus 3 becoming 1 Celsius.
Freezing level:
Around 1000 metres.

Ground conditions

Latest: Date of observations: 22/11/2014 Observation made on: 22/11/2014 Time of observation: 1:00 am Winter conditions above: n/a Ground Conditions: No adverse ground conditions observed by National Park Wardens. Observations on: n/a Observation Text: n/a Kit Advice: Wear sturdy walking boots, take waterproofs, hat, gloves and spare warm layers.

Issued at: 0401 on Sun 23 Nov 2014

Mon 24 Nov 2014

It will be a cold night across the park with a widespread frost and some valley fog patches. Where the fog patches do occur, they will be slow to clear through Monday morning. Otherwise, it will be another largely fine, but cold day across the hills with good spells of sunshine. Temperatures will fall markedly after dusk through sheltered valleys with some fog patches possible.

Visibility

Generally very good or excellent with distant hills clearly discernible. However, visibilities will be very poor in any early fog patches and where shrouded in any banks of low cloud as the fog lifts.

Hill Fog

Any fog patches will slowly lift through the morning. As they do so, they may give some transient hill fog across lower slopes for a time. Otherwise, no cloud is expected on the hills.

Max wind above 500m

West-southwesterly 15-20mph.

Temperature

Valleys:
Minus 2 becoming 10 Celsius.
800m:
Plus 1 Celsius.
Freezing level:
900 to 1000 metres.

Issued at: 0401 on Sun 23 Nov 2014

Tue 25 Nov 2014

Another bright and cold morning with any valley fog patches slowly clearing. However, cloud is likely to increase from the south through the day with rain and extensive hill fog spreading in through the late afternoon and evening period. This rain will likely fall as snow for a time across the summits leading to very poor visibilities. Light easterly winds.

Issued at: 0401 on Sun 23 Nov 2014

Wed 26 Nov 2014

A dull, damp and murky day with outbreaks of rain, possibly heavy at times. The cloud will be low enough to produce extensive hill fog above 400m, possibly lower at times, leading to very poor conditions for walking and feeling cold in exposure. Clearer and colder conditions may push in from the west later in the day. Brisk northerly winds.

Issued at: 0401 on Sun 23 Nov 2014

Thu 27 Nov 2014

A largely bright, but chilly, morning. However, cloud and rain will spread in from the west later in the day with upland southerly gales developing.

Issued at: 0401 on Sun 23 Nov 2014