Blog by Jo Farrow
12th September 2019 12:35

UK September warmth, up to 25C on Thursday possibly higher this weekend. Rain in Spain.

Tropical cyclones have been stirring up the Atlantic atmosphere, even once they have lost their tropical characteristics, faltered and changed into more run of the mill low pressures. They have shoved the jet stream, running way up high and caused perturbations that have resulted in unsettled weather over Spain and the western Med. and will bring some September warmth to the UK. 

Jetstream atlantic

Earlier this week a cutoff vortex setup over Iberia and it has been very wet. Holidaymakers will be quite disgruntled, especially when the UK gets a bit of warmth. There are heavy rain and thunderstorm warnings, with gusty winds and large waves for the Costa Blanca, including Alicante and Benidorm and the Balearics, so Ibiza and Majorca. There is the risk of flooding as the warnings continue this week, easing at the weekend. 

AEMET Spain warnings

For the UK, it will be warmer on Thursday with 24 or 25C forecast for the London area.  This air was part of Tropical Storm Gabrielle, now remnants mixed up with rain moving across the UK. 

It has been windy for the middle of the week but the jet stream is shifting northwards as surface high pressure builds up from the south. this brings more settled conditions but the far north of Scotland will see wet and very windy weather on Saturday. The overall pattern of the jet is very zonal, coming straight west to east not rippling up and down, but it has displaced to the north compared to midweek. 

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You can see that the very unsettled weather over eastern Spain will ease. The warmer air from the south is pulled northwards over the UK. With high pressures, it depends on the wind direction and cloud cover but there is the potential for mid 20sC again in the south and perhaps high 20sC at the weekend. The settled weather will hold on into Monday 16th. Make hay. 

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