Wednesday 17th August Weather forecast for the Western Isles.

Good evening Western Isles on this Tuesday evening we are seeing plenty of cloud with some clear spells. Winds gusting 10 to 25 mph and today’s high of 14.8C

It was a cooler day across the islands today. Drier and brighter once the morning rain cleared away allowing for some sunshine.

Wednesday

High pressure is firmly in control on Wednesday which will give us a mostly settled day but there is a broad area of low pressure awaiting out West which will become a dominant feature of our end of the week weather.

Overnight – Clear skies and cloud. Under these clear skies, we will see temperatures drop into single figures. Winds under 20 mph.

The Met Office model, as shown in the image below, indicates temperatures could get as low as 5C.

Image credit the Weather Outlook.

Morning – A mixture of sunshine and cloud some decent and prolonged sunshine with variable amounts of cloud. Winds under 20 mph.

Afternoon and evening – The cloud is expected to build back in with some sunny spells. Occasional scattered showers and some rain but for most staying largely dry. Winds of 10 to 30 mph.

Sunrise and Sunset

Stornoway – 05:51 and 21:07

South Uist – 05:59 and 21:05

Outlook

Thursday and Friday – Sunshine and showers with brisk wind. The showers heavy at times. In between some decent spells of sunshine. Winds of 20 to 40 mph.

Saturday

Has got my attention. The computer models have been hinting at a low pressure system forming close to the Westen Isles overnight Friday into Saturday. There is a lot of uncertainty as yet . The consistent part of is that we are seeing plenty of rain being shown by the models on each run but not so much the area of low pressure. The GFS had the low pressure on the 18z model run last night but has backed off on it since. The EC is showing the area of low pressure this evening and as is the Met Office model the UKV.

If what is being shown by the EC we could see some heavy rainfall in a short period of time with winds gusting 40 to 50 mph. The image below from WX charts shows the low pressure below. Remember this is just one model run. But I will be keeping an eye on it.

So at the moment, I am expecting to see overnight heavy rain and persistent rain with sunshine and showers during the rest of the day. Winds of 20 to 40 mph and temps of 11C to 15C

Sunday – A mostly fine and dry day with a few scattered showers plenty of cloud. Winds under 20 mph. Temps of 11C to 16C

Have a great evening

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