It comes into effect at 5pm on Tuesday and runs through to 6pm on Wednesday, affecting all counties.
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He said: “The Dundee area is likely to see activity in the early hours of Wednesday until we see the first sway of heavy thundery showers”.
An area of moist air will mix with the hot conditions, which now sit over Essex, on Tuesday night into Wednesday, sparking downpours and even the risk of thunder and lightning.
The Met Office has issued a yellow weather warning that extends across the region, from Northumberland down to Teesside from tomorrow evening.
Public Health England (PHE) is urging people to look out for elderly relatives and friends who may be susceptible to the high temperatures – and to take extra care of young children, babies and those with heath issues.
The alert says that should a thunderstorm strike, there is the potential for localised torrential rain and hail which may lead to surface water flooding.
The Met Office warning states: “Whilst most places will miss the worst, please be aware of the risk of flash flooding”.
Transport networks and power could also be disrupted because of the weather.
Around 30mm of rain could fall each hour in some places, and lightning, hail and strong winds have also been predicted on Wednesday.
Some locations could see flash flooding with more than 50mm of rain over the course of a few hours. “There’s potential for almost a month’s rain in some areas during the time we have the warning”.
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“On Tuesday afternoon, western and south western parts will see some quite nice, warm, sunny spells as the heavy, showery rain moves away to the north”.
