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Snowdonia

Weather hazards over 300m on Tue 01 Sep 2015

High risk

No high risks
none

Medium risk

Thunderstorms
Risk of lightning in showers.

Low risk

Heavy persistent rain
Showers will be locally heavy, but should be short-lived.
Strong sunlight
Risk of exposure with any prolonged sunny spells.

No risk

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

Tue 01 Sep 2015

Bright or sunny at times with variable cloud. Early morning mist and hill fog patches will soon clear. Some showers will likely form over the hills during the day with the odd heavier one possible and risk of lightning. Feeling on the cool side with sometimes fresh northwesterly winds.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Light shower day Heavy shower day Light shower day Sunny intervals Sunny intervals Partly cloudy night
Precipitation probability
30% 30% 30% 30% 30% 20%

Visibility

Mostly good or very good. Locally moderate in showers. Poor for a time in early morning patchy hill fog.

Hill Fog

Patchy hill fog is possible on slopes above 500 metres during the early morning, then lifting, but cloud bases lowering to around 700 metres in showers.

Max wind above 500m

Northwesterly, mainly light or moderate, but locally fresh on peaks with speeds 15 to 20 mph and gusts to 30 mph.

Temperature

Valleys:
Plus 9 bec 17 Celsius
800m:
Plus 6 Celsius
Freezing level:
Will be above the peaks.

Wed 02 Sep 2015

It will be bright or sunny with variable cloud and a few showers. Any early morning mist and hill fog patches will soon clear. Some showers will likely form during the day, these may be locally heavy during the afternoon. Feeling on the cool side with fresh, locally strong northwesterly winds.

Visibility

Poor for a time in early morning patchy hill fog. Moderate in showers. Otherwise mainly good.

Hill Fog

Patchy hill fog is possible on slopes above 500 metres during the early morning, otherwise nil.

Max wind above 500m

Northwesterly fresh or strong on peaks 25 to 30 mph.

Temperature

Valleys:
Plus 16 Celsius
800m:
Plus 6 Celsius
Freezing level:
Will be above the tops.

Thu 03 Sep 2015

Broken cloud with some bright spells. A few light showers may form during the afternoon. Hill fog will be limited to the early morning period. Still feeling chilly on peaks in brisk or strong northerly winds.

Fri 04 Sep 2015

Most places will be dry broken cloud and some bright or sunny spells, but cloud increasing later. Hill fog is possible for a time during the early morning. An isolated afternoon showers is possible. Fresh or strong northwesterly winds.

Sat 05 Sep 2015

Rather cloudy with occasional patches of light rain and hill fog. Moderate or fresh northwesterly winds.

Issued at: 0752 on Tue 01 Sep 2015