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Weather hazards over 300m on Sat 01 Nov 2014

High risk

Gales
Winds will increase to 40-50mph with gusts 60mph from mid afternoon and into evening.
Persistent extensive hill fog
Occasional periods of hill fog above 600m during the day. Then becoming extensive by late afternoon
Heavy persistent rain
Heavy rain will develop from the west by late afternoon.

Medium risk

Severe chill effect
Significant wind chill will make it feel closer to -3 to -4C by late afternoon.

Low risk

No low risks
none

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Thunderstorms
none
Strong sunlight
none

Sat 01 Nov 2014

Outbreaks of rain and extensive hill fog will clear to the east leaving a clearer dawn with just the odd isolated shower. Sunny spells during the morning will become increasingly hazy as cloud builds from the west. Conditions will deteriorate markedly later in the afternoon with heavy rain and upland gales, perhaps severe for a time. Hill fog will become extensive.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Sunny intervals Sunny intervals Cloudy Heavy rain Heavy rain Heavy rain
Precipitation probability
20% 10% 30% 80% 90% 80%

Visibility

Generally moderate to poor at first, but becoming very good through the morning. Deteriorating once again to moderate to poor by late afternoon. Visibilities will be less than 100 metres where shrouded in the cloud.

Hill Fog

Extensive above 300-500m at first, clearing to occasional periods of hill fog above 700m during the morning, with eastern hills seeing the best clearances. Bases will lower and become extensive above 300-500m once again by late afternoon and into the evening.

Max wind above 400m

Southwesterly 35-45mph. Winds will increase rapidly later in the afternoon to become southerly 40-50mph with gusts 60mph.

Temperature

Valleys:
Plus 9 becoming 15 Celsius
800m:
Plus 6 becoming 9 Celsius
Freezing level:
Above the summits.

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
0300 on Sat 01 Nov 2014
Last 24 hours:
0.4 mm
Last 48 hours:
2.6 mm
Last 72 hours:
5.8 mm

Rainfall data provided by the Environment Agency. The Met Office is not responsible for content provided by third parties and may remove this data without warning.

Issued at: 0337 on Sat 01 Nov 2014

Sun 02 Nov 2014

A day of sunny spells and showers. The showers will be heavy at times with the risk of hail and thunder, more especially later in the day when the showers may become more frequent and locally prolonged. There will be a marked wind chill at height which will exacerbate the cold feel across the summits.

Visibility

Generally very good outside the showers, but temporarily poor in the showers and very poor in the periods of hill fog.

Hill Fog

Rapidly fluctuating cloud base throughout the day with periods of hill fog above 600m, particularly during showers, and temporary clearances to summit level. The most prolonged clearances will be across eastern hills during the afternoon.

Max wind above 400m

Southwesterly 35-45mph.

Temperature

Valleys:
Plus 8 becoming 13 Celsius
800m:
Plus 6 Celsius
Freezing level:
Above the summits.

Issued at: 0337 on Sat 01 Nov 2014

Mon 03 Nov 2014

A cool, showery day with some bright or sunny spells at times. The showers will be heavy at times with the risk of hail and lightning. They may even fall as sleet later in the day across the very highest summits. Southwesterly winds will stay strong resulting in a significant wind chill. The freezing level will remain above the summits though.

Issued at: 0337 on Sat 01 Nov 2014

Tue 04 Nov 2014

A mix of sunshine and scattered showers and staying fairly breezy with fresh northerly winds. Again the showers may fall as sleet over the highest summits. This will make it feel cold at height but the freezing level will stay above the summits.

Issued at: 0337 on Sat 01 Nov 2014

Wed 05 Nov 2014

After a frosty start, it will be a largely fine day across the park with good periods of autumnal sunshine and light winds. Temperatures will fall readily after dusk with a widespread frost overnight.

Issued at: 0337 on Sat 01 Nov 2014