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Thunderstorms to bring flooding on hottest day of year

Met Office issues severe weather warning for large swathe of Britain as forecasters predict blast of very humid air will bring highs of 27C

Lightning storms could bring flooding, the Met Office warns (Library image) Photo: PALightning-2_786969b

A severe weather warning has been issued for thunderstorms on what is set to be the hottest day of the year – as hayfever sufferers are hit by extremely high pollen levels.

The Met Office put out the alert, covering a large swathe of Britain for Friday and Saturday, as forecasters predicted a blast of very humid air could bring highs of 27C.

It said there is a chance of “significant disruption” from surface water flooding, while lightning and hail could also cause problems across southern England, south Wales, the Midlands and the east of England.

Isolated severe thunderstorms are likely to begin from noon on Friday, followed by a band of more widespread heavy rain until the early hours of Saturday.

There is potential for high amounts of rainfall in very short periods in some areas, such as 20 to 30mm within an hour, added the Met Office.

The conditions are set to be caused by an area of warm, humid air moving across France into southern Britain overnight on Thursday.

The mercury could soar as high as 28C, beating the year’s previous highest point of 26.7C recorded in Frittenden, Kent last Friday.

It comes as the Met Office warned that pollen levels will be at their highest possible levels over the next few days.

Levels are expected to be “high” in most parts of Britain on Wednesday, rising to “very high” across much of England on Thursday and Friday.

A clear blue sky above the Souter Lighthouse in the village of Marsden, South Tyneside on Wednesday (Owen Humphreys/PA)

Met Office forecaster Dean Hall said: “Friday will start very warm and humid in the South but end up with thundery rain.

“Maximum temperatures, particularly in the South East, could reach 25C or 26C. There might be somewhere reaching 27C or even 28C.

“South Wales could see 24C, with 21C in the Midlands and the North.”

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He added: “But the thing that may spoil it is thunderstorms triggered by the heat and humidity. The atmosphere will become unstable.

“It looks like a more persistent band of heavy downpours as we go through Friday evening into Saturday.”

Poppies in bloom at Bamburgh Castle, Northumberland, on Wednesday (Owen Humphreys/PA)

Bookmakers are confident that Friday will be the hottest day of the year, with Coral offering odds of 8-11.

Punters can also get odds of 7-4 that the temperature reaches at least 28C.

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Coral’s Nicola McGeady said: “The great British weather has disappointed us so far, but the odds suggest that will change by Friday, with the hottest day of the year so far expected.

“Whether it lasts or not remains to be seen.”

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This entry was posted on June 10, 2015 by and tagged , , .

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