Summary for all mountain areas

A warm and humid day with extensive low cloud affecting many hills and pulses of thundery rain moving north through the morning followed by further clusters of showers or thunderstorms. Becoming largely dry through the afternoon across Wales as winds veer southwesterly. Best of the cloud breaks will be towards the west coast.

Headline for Cairngorms NP and Monadhliath

Heavy rain extending north, risk lightning. Extensive hill fog.

How windy? (On the Munros)

Easterly; widely 30-45mph, sudden ferocious gusts lower slopes & valleys. Will tend to drop to low speeds from south (timing uncertain).

Effect of wind on you?

Risk of arduous walking conditions across higher terrain, and in places very gusty to lower slopes. Easing by afternoon.

How Wet? (Precipitation and its impact)

Extensive rain; risk lightning. Easing for a time.

Low confidence of detail: A swathe of rain, including areas of heavy or torrential rain and thunderstorms, will move north across the area through the morning. May tend to become more showery and ease for a time in the afternoon, before further thundery rain arrives late on.

Cloud on the hills?

Very extensive and low

Fog extensive most or all day. Across eastern Cairngorms NP and perhaps N Cairngorms, the cloud for perhaps long periods from lower slopes up. Generally highest cloud base toward Ben Alder.

Chance of cloud free Munros?

10%

Sunshine?
Air clarity (below cloud)

Little or no sunshine. Very hazy - even when dry. Very poor visibility in heavy rain.

How Cold? (at 900m)

8C, increasing humidity.

Freezing Level

Above the summits.