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Snowdonia

Weather hazards over 300m on Mon 03 Aug 2015

High risk

No high risks
none

Medium risk

No medium risks
none

Low risk

Persistent extensive hill fog
Cloud around 500 metres during the morning giving poor navigation.

No risk

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

Mon 03 Aug 2015

A cloudy night with some showery rain. A cloudy start with perhaps some low cloud. This should lift and break to give some bright or sunny spells during the day. Perhaps a few mostly light showers.

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 intervals Sunny intervals Partly cloudy night
Precipitation probability
10% 10% 0% 0% 0% 0%

Visibility

Generally good..

Hill Fog

Scattered or broken around 500 metres becoming nil.

Max wind above 500m

Southwesterly 40mph.

Temperature

Valleys:
Plus 10 Celsius becoming plus 18 Celsius.
800m:
Plus 10 Celsius.
Freezing level:
Above the summits.

Tue 04 Aug 2015

A dry night with a band of showery rain spreading from the west in the early hours. A wet start to the day but this clears during the morning to give a mostly dry afternoon with some sunshine and just the odd shower.

Visibility

Generally good but moderate for a time in rain.

Hill Fog

Broken or overcast around 500 metres for a time in rain, otherwise nil.

Max wind above 500m

Southwesterly 45mph.

Temperature

Valleys:
Plus 12 Celsius becoming plus 16 Celsius.
800m:
Plus 10 Celsius.
Freezing level:
Above the summits.

Wed 05 Aug 2015

Mostly dry with clear spells overnight. Further showers are likely to spread from the west during the morning to give some rain at times during the afternoon. Visibility starting good but becoming moderate as showers arrives. Winds freshening from the south during the day.

Thu 06 Aug 2015

Cloudy with some showery rain overnight. A cloudy day with outbreaks of showery rain at times. Most of this will be light. Visibility will be moderate with cloud bases covering some of the high ground at times. Light winds.

Fri 07 Aug 2015

Mostly dry overnight and a dry start to Friday with light winds. Any low cloud and poor visibility will improve during the morning to give a dry day with some sunshine. Winds will be light with visibility improving to good by late morning.

Issued at: 0340 on Mon 03 Aug 2015