UK braced for first 'official' heatwave of year with temperatures in 'high 20s'

The UK faces its next heatwave - with temperatures hitting the HIGH TWENTIES - within days. Temperatures are expected to rise into the high-20Cs, possibly constituting the first heatwave of the year, according to a leading weather forecaster.

The Met Office defines a heatwave as "when a location records a period of at least three consecutive days with maximum temperatures meeting or exceeding a heatwave temperature threshold". It remains to be seen whether the temperature hits this mark.

But Exacta Weather forecaster James Madden said the UK can expect "changes to warm to hot southerly winds from later this week and into early May." He predicted: "Some of the main third-party computer models are currently indicating a mixed week with a return to heavy rain due to low pressure by the upcoming weekend.,

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"The cooler conditions throughout this week will also initially be accompanied by some extensive frosts, particularly in rural areas for the time of year during this working week. However, a number of these main third-party computer models also want to build in some very warm weather throughout the upcoming weekend and for in and around April 28 and into the early part of May, and our forecast significantly favours this pattern to gain more of a stronghold within this developing period.

"The forecast signals are not certain or entirely agreed upon within the main third-party computer models as of yet, but they are likely to change more around to our forecast idea for this period and a decent period of early and widespread summer warmth for at least several days from around later this week and into early May as much warmer to potentially hot southerly winds prevail across our shores.

"If things develop as expected, then we can expect maximum temperatures to reach into the mid- to high 20's, at the very least in the best of the developing sunshine within this period." Heatwaves are most common in summer when high pressure develops across an area.

High pressure systems are slow moving and can persist over an area for a prolonged period of time, such as days or week, the Met Office says on its website.