Weather tracker: extreme heat to spread across southern US and Mexico

Record temperatures will continue to put stress on power grids with blackouts reported in some areas

Extreme and prolonged heat looks set to continue across the southern states of the US and Mexico through this week. This heatwave, which has already brought record temperatures across Texas through the past two weeks, will extend into states such as Oklahoma, Arkansas, Missouri and Louisiana over the coming days.

At least 50 million people have been placed under extreme heat advisories as temperatures are forecast to soar at least 5-10C above the climatological average, with daily maximum temperatures reaching 40-45C (104-113F). San Angelo airport in Texas has already recorded two consecutive days where the temperature hit 45.6C (114F), which surpasses its highest ever temperature by three degrees.

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