Two days of record-breaking heat is set to end with storms hitting Northamptonshire on Wednesday (July 20).
A spokesman many areas could escape the worst of the weather but added: “Whilst most places will see only small amounts of rain, there is a chance of some isolated heavy downpours and lightning.
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“Where these occur a few sites could see 20-30 millimetres in an hour and 50 millimetres in three hours.”
Tomorrow’s warning comes into force at 1pm and lasts until 9pm, although it will still be warm at 25°C.
The Met Office climate station at Pitsford School saw its hottest day on record with a high temperature of 36.2°C at 3.36pm — fractionally hotter than the 36.1°C from July 2020.
Maximum air temperature, though, was 38.2°C, smashing the Northamptonshire record of 36.7°C recorded at Raunds on August 9, 1911.
The highest ‘apparent’ temperature was a sweltering 51.5°C at 3.06pm.
Experts predict that could be beaten on Tuesday (July 20) with temperatures up to 40°C widely predicted.
A Northamptonshire Fire & Rescue Service spokesman said: “The Met Office Fire Severity Index is an assessment of how severe a fire could become if one were to start. Today for Northamptonshire, it is level five — which means exceptional severity.”