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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Mon 29 May 2017

High risk

No high risks
none

Medium risk

Thunderstorms
Heavy and occasionally thundery showers with hail, mainly in the morning.
Heavy persistent rain
Widespread occasionally heavy showers through the evening.

Low risk

Persistent extensive hill fog
Developing from the south from late morning.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Severe chill effect
none
Strong sunlight
none

Mon 29 May 2017

Heavy and occasionally thundery showers through much of the early hours. These will slowly ease northwards through the early morning. Outbreaks of rain will continue from then on into the afternoon but these will be lighter, although hill fog will become more widespread.

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
Heavy shower night Heavy shower night Light shower day Light shower day Cloudy Cloudy Cloudy Cloudy
Precipitation probability
80% 60% 40% 40% 10% 10% 10% 10%

Visibility

Moderate or poor in the heavy showers, becoming good through the morning. Moderate again in the rain later and very poor in the hill fog.

Hill Fog

Ragged around 700 metres in the heavier showers, but becoming well broken around 400 metres through the afternoon and evening.

Max wind above 500m

Southeasterly 30mph at first.

Temperature

Valleys:
Plus 12 rising to plus 16 Celsius.
800m:
Plus 9 Celsius
Freezing level:
Above the summits.

Tue 30 May 2017

Patchy mainly light rain or showers at first. A weakening band of rain will then cross eastwards through the late morning and into the early afternoon. Turning drier through the afternoon and evening with some brighter spell, but also scattered showers with increasing westerly winds.

Visibility

Moderate or good, occasionally poor in rain. Becoming good, but falling to moderate in any further rain.

Hill Fog

Well broken around 400 metres for much of the morning and early afternoon. Lifting above the summits through the early evening.

Max wind above 500m

West or northwesterly 40mph.

Temperature

Valleys:
Plus 12 Celsius becoming plus 16 Celsius.
800m:
Plus 9 Celsius.
Freezing level:
Above the summits.

Wed 31 May 2017

Dry and bright with long spells of sunshine with winds slowly easing. Feeling warm, with a high risk of sun exposure.

Thu 01 Jun 2017

Some overnight fog in the valleys, but otherwise another dry and bright day with plenty of long sunny spells.

Fri 02 Jun 2017

A dry start, but turning cloudy with a band of occasionally heavy rain moving eastwards through the morning, perhaps clearing from the extreme west later in the day.

Issued at: 1623 on Sun 28 May 2017