Wet Weekend 12th/13 September.

Good afternoon all we are going to see some wet weather across the islands this weekend. But the very worst of the wet weather will be across mainland Scotland and Skye.

As of 1400 on Thursday 10th of September no weather warnings for rain have been issued for the Western Isles. Please refer to the Met Office website or app.

A Met Office weather warning has been issued from 1800 Saturday till 2359 Sunday evening.

This is the chief forecasts text forecast for the above warning.

A band of heavy and persistent rain will arrive across western Scotland during Saturday evening, and continue through much of Sunday. Many places in the highlighted region will see 25-50 mm of rainfall however, over the hills and mountains, peak totals of 120-160 mm are likely during this time. In association with the rainfall, there will be a period of strong southwesterly winds, although these are not expected to be overly impactful, they may make travelling conditions more challenging in places.

For the very latest and the full warning please follow this link https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings#?date=2020-09-12&id=4ee5f5ad-7b5b-463c-bfcc-8ac4721fba8e&details

So in the next part of the blog I am going to try something new but takes some explaining. The next two images come for the site WX charts and highlights what two of the main computer models are suggesting may happen over the weekend rainfall total wise. You will also sport the differences between the two.

The first will be the GFS model run this is run 4 times a day a 0Z 06Z 12Z and 18Z runs. This image below is from the 06Z run. This is a total rainfall accumulation from when the run began and for the next 5 days.

This goes with a rough spread of around 37mm for Lewis. 45-50 mm for Harris, North/South Uist, Benbecula and Barra for the next 5 days.

The second will be the Euro model run this is run 2 times a day a 00Z and 12Z runs. This image below is from the 00Z run. This is a total rainfall accumulation from when the run began and for the next 5 days.

This goes with a rough spread of around 65/70 mm for Lewis. 80/90mm for Harris with the highest totals across the clisham. 60/70 mm for North and South Uist and Benbecula and 50/55 mm for Barra.

This is worth noting that this is just one model run and this could all change by the next model run but worth keeping in mind as we are going to see some wet conditions.

The above images come from https://www.windy.com/?58.212,-6.389,5,i:pressure

Worth also noting that if you are travelling that there could be some travel disruption from the rainfall. We are also likely to see winds gusting 40 to 50 mph which could also cause some travel disruption. Nothing massively unusual for this time of year but worth being aware.

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.

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