Tuesday’s forecast – Heavy rain then squally showers

Good evening Western Isles plenty to get stuck into this evening. So this might be a longer than normal update. I am going to attempt to clarify a few things that have caused confusion today. On this Monday evening, we are seeing rain and showers across Lewis and Harris. Drier for Uist and Barra with clear skies and cloud. Winds under 20 mph and today’s high of 6.7C

The Met Office has named two storms today. Storm Dudely which will bring strong winds on Wednesday and Thursday with a yellow weather warning being issued by the Met Office for the Western Isles and Storm Eunice for Friday which will bring the strongest winds at this stage to the Southern half of the UK. But we may see some impacts from wintry weather from Eunice. A lot of uncertainty yet but I hope to be able to clarify things further on impacts in the coming days.

So the Met Office yellow weather warning issued for Storm Dudely comes into force at 15:00 on Wednesday afternoon and expires at 18:00 Thursday evening. The full warning and latest updates can be found via the Met Office website or app.

Now I have had a few people ask why isn’t this showing strong winds speeds on some apps at the moment despite the weather warning mentioning winds of 60 / 70 mph. This is still a developing area of low pressure and there is the uncertainty of the exact strength and position of the low pressure. This will impact where we will see the strongest winds. None of the apps had 90 mph for Storm Corrie hitting Stornoway. ( Dudley is not expected to be as strong as Corrie for the Western Isles ). Rember an app is just showing one possible outcome from a single computer model run. When the Met Office issue warnings they use multiple weather models and model runs. With this, it helps them to get a better idea of what may happen more so than just using a single model run which you will see on an app. Apps have their uses but on a dynamic ever changing weather system they can be flawed.

Back to the forecast –

Overnight – heavy and persistent rain will move across the Western Isles. The cloud will dominate. Winds of 20 to 40 mph.

Morning – Sunshine and showers these will be squally at times. Merging into some longer spells of rain. Some decent sunny spells. Winds of 20 to 40 mph.

Afternoon and evening – The showers become more scattered. Still squally and possibly wintry. Some decent sunny spells. Clear skies and cloud after sunset. With a risk of frost and ice. Winds under 30 mph.

Winds will be from variable directions and temps of -1C to 7C

Sunrise and Sunset

Stornoway – 07:58 and 17:28

South Uist – 08:00 and 17:29

Outlook

Wednesday – We will see heavy rain sweep across the Western Isles with winds gusting 40 mph into the evening winds will gust 50 to 60 mph strongest at this stage for Uist and Barra gusting to 70 mph. Winds will be from the South and South West. Temps of 3C to 7C

Thursday – Strong winds to start the day gusting 50 to 60 mph for Lewis and Harris gusting 70 to 80 mph for Uist and Barra with further spells of rain. Strong winds lasting into the afternoon gusting 50 to 60 mph before easing further into the evening. Winds will be from the West and North West. Temps of 4C to 7C

Friday – Lots of uncertainty as yet but we could see some snow across the Western Isles and winds gusting 40 to 50 mph. From the North and North West. Temps of 0C to 5C

Saturday – Sunshine and showers with brisk winds. Winds gusting 40 mph from variable directions. Temps of -1C to 7C

have a great evening

Please do NOT use Western Isles Weather for the protection of life and property please follow local and national government issued warnings and advice. Please have more than one source for weather information in extreme weather, Such as the Met office and follow any advice and instructions from emergency responders.

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