Summary for all mountain areas

Severe conditions on mountains near the Irish Sea as upland gales or severe gales (Wales) spread inland ahead of a band of heavy rain and low cloud. Winds will strengthen into Scotland, but low cloud and a little rain will be mostly confined to southern Scotland.

Headline for Brecon Beacons

Upland gales or severe gales. Rain for several hours.

How windy? (On the summits)

Southerly, 40 to 50, perhaps locally 60mph. An easing to 20 or 25mph will spread slowly eastwards afternoon and early evening.

Effect of wind on you?

Walking very difficult across the hills most of day. You may be blown over where exposed on some crags and summits. Significant wind chill.

How Wet?

Heavy/torrential rain; clearing to showers afternoon. Risk lightning

Widespread rain: initially a little rain here and there. But toward midday, heavy rain (widely torrential Brecon Beacons/Preseli hills) and persistent over a few hours will spread slowly east. Risk thunder. Some streams will rise rapidly; possible flooding. In turn slowly from the west will clear to a few showers from early or mid afternoon.

Cloud on the hills?

Persistent in slowly eastward moving band over several hours.

Very varied conditions: Occasionally in morning and again from west late afternoon or evening, breaks to higher tops. Otherwise extensive fog above 400 to 600m, although lower south of Brecon.

Chance of cloud free summits?

30% but soon less than 10% Brecon Beacons

Sunshine and air clarity?

Patches sunshine spreading eastwards only late afternoon when haze will clear and visibility become excellent.

How Cold? (at 750m)

9C. Will feel as cold as minus 3C directly in the wind.

Freezing Level

Above summits