Friday could be the HOTTEST EVER DAY in the UK

Meanwhile sun worshippers in the United Kingdom have sizzled in the hottest temperature of the year so far, with a scorching 33.3C recorded in England yesterday.

"Where these occur, expect torrential downpours with a much as 30mm of rainfall in one hour and 60mm in three hours".

Warnings to stay out of the sun during the heatwave have been criticised by tourism bosses.

- Met Office issues yellow weather warning for rain and thunderstormsYellow and Amber warnings represent a range of impact levels and likelihoods, which can include damage to property, travel delays and cancellations, loss of water supplies and power cuts.

Porthmadog in North Wales had held the record for the hottest day of the year so far, with temperatures reaching 33C (91.4F) on June 28.

The record breaking heat comes as people are being urged to either stay out of the sun or at least avoid being in the sun when it is at its strongest between 11am and 3pm.

It could get hotter, as the Met Office warns of temperatures peaking on Thursday and Friday - potentially hitting the mid-30s.

Covent Garden
FLIR SWELTER The conditions at Covent Garden. On the right is temp in C

Temperatures are predicted to reach 35C midweek, threatening the record for the hottest July day, which was set at Heathrow in 2015 with 36.7C.

Steve Jordan, of the Eastbourne Hospitality Association in East Sussex, said: "We've had long hot summers in the past and I don't remember warnings telling us not to go out in the sunshine".

Mr Burkill also said that temperatures above 34C "can't be ruled out".

And as the harvest begins early in many places following the driest first half of summer on record, farming leaders warned crops such as spring barley and sugar beet are being hit.

A humid plume of air from Europe, blamed by forecasters for the heatwave, has created the ideal conditions for thunderstorms.

Although there is no official definition of a "heatwave" in the United Kingdom, the term can be used to describe an extended period of hot weather relative to the expected conditions of the area at that time of year.

But conditions this week have been nearer normal for the time of year in Northern Ireland and western Scotland, which are seeing lower temperatures and rainy spells.

  • Rogelio Becker