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Snowdonia

Weather hazards over 300m on Thu 25 May 2017

High risk

Strong sunlight
High levels of UV during prolonged sunshine at altitude.

Medium risk

No medium risks
none

Low risk

No low risks
none

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Severe chill effect
none
Persistent extensive hill fog
none
Thunderstorms
none
Heavy persistent rain
none

Thu 25 May 2017

Dry with light southeasterly winds and prolonged sunshine. Feeling very warm and rather humid. Any early low cloud or local mist will soon burn off in the early dawn period. Some fair weather cloud is likely to develop through the day. High UV levels at altitude.

Time
0000 to 0300 0300 to 0600 0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Partly cloudy night Partly cloudy night Sunny intervals Sunny day Sunny intervals Sunny day Sunny day Clear night
Precipitation probability
0% 0% 0% 0% 0% 0% 0% 0%

Visibility

Good to very good - 15-25 kilometers with a slight haze possible in the evenings.

Hill Fog

Few patches possible very early morning, otherwise none expected.

Max wind above 500m

Southeast 20 mph.

Temperature

Valleys:
Plus 13 Celsius rising to 25 Celsius.
800m:
Plus 14 Celsius
Freezing level:
Well above the summits.

Fri 26 May 2017

Another dry, very warm and sunny day. Less cloud likely than on Thursday with drier air. Southeasterly winds persisting and a little stronger than Thursday. High UV levels again. Remaining dry during the evening but with an increasing risk of thundery showers early Saturday.

Visibility

Good to very good - 15-25 kilometers with a slight haze possible in the evenings.

Hill Fog

None expected.

Max wind above 500m

Southeasterly 30 mph.

Temperature

Valleys:
Plus 13 Celsius rising to Plus 25 Celsius
800m:
Plus 14 Celsius
Freezing level:
Well above the summits.

Sat 27 May 2017

Warm and muggy with a risk of heavy showery rain or thunderstorms during the morning especially. Mainly dry during the afternoon and feeling cooler, but still quite humid. Moderate winds will veer from southeast to near westerly. Mainly dry with light winds overnight.

Sun 28 May 2017

Sunday is currently uncertain, but most likely starting dry and bright, then later in the day thickening cloud bands and perhaps leading to some showery rain. Still fairly warm, with light north or northwesterly winds, but fresher than previous days.

Mon 29 May 2017

A fresher feel to the day with some sunny skies and mainly dry conditions. Light northwesterly winds perhaps becoming stronger from the southwest later.

Issued at: 1605 on Wed 24 May 2017