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Brecon Beacons

Weather hazards over 300m on Sun 01 May 2016

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Cloud lowering to 300 metres at times by midday giving poor navigation.

Low risk

Gales
Chance of winds reaching 40-50 mph over hill tops after midday.

No risk

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

Sun 01 May 2016

A dry and perhaps bright start but with outbreaks of light rain or drizzle spreading in from the west by mid morning. That will leave a damp afternoon with low cloud and further light rain or drizzle.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Cloudy Light rain Light rain Cloudy Cloudy Light rain
Precipitation probability
20% 80% 80% 40% 40% 60%

Visibility

Good becoming moderate or poor in rain and very poor in hill fog.

Hill Fog

Well broken above 500m, lowering to broken or overcast around 300m after midday, mainly on southwesterly upslopes.

Max wind above 400m

Southwesterly 55 mph.

Temperature

Valleys:
Plus 2 Celsius becoming plus 8 Celsius.
800m:
Plus 1 Celsius becoming plus 5 Celsius.
Freezing level:
Above the summits.

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
0300 on Sun 1 May 2016
Last 24 hours:
0.0 mm
Last 48 hours:
0.2 mm
Last 72 hours:
5.6 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.

Mon 02 May 2016

A damp and windy night with some light rain or drizzle but relatively mild. A cloudy and windy day to come with outbreaks of rain becoming heavy during the morning. The heavy rain will clear just after midday with a brighter afternoon of sunshine and a few blustery showers.

Visibility

Moderate or poor and very poor in hill fog. These conditions will become excellent shortly after midday as the cold front clears through.

Hill Fog

Broken or overcast around 300-400m becoming scattered around 500-600m after midday.

Max wind above 400m

Southwesterly 55mph.

Temperature

Valleys:
Plus 6 Celsius becoming plus 12 Celsius.
800m:
Plus 4 Celsius.
Freezing level:
Above the summits.

Tue 03 May 2016

A blustery day of sunshine and showers some of which will turn heavy through the afternoon. It will feel quite cool over the high ground with a blustery wind and temperatures in single figures. Winds will gust 30-35 mph, especially in any sharp showers. Visibility excellent but moderate in showers.

Wed 04 May 2016

A dry and bright day with sunshine at times. The sunshine will be hazy but quite strong with high UV levels. The day should stay dry with a fresh south to southwesterly wind and generally moderate or good visibility.

Thu 05 May 2016

With rain bands being held out to the west the day should again be dry and fine with temperatures picking up on recent days. Sunshine again will come and go and again UV levels will be high around midday. WInds will be a fresh southerly of 20-25mph.

Issued at: 0450 on Sun 01 May 2016