Within a matter of hours, the extreme heat that had been tormenting northern Italy for weeks gave way to exceptional rainfall, flooding and a sharp drop in temperatures. The regions hit hardest were Liguria , Lombardy and the northern part of Tuscany .

The disturbance that swept in was “fuelled” by a marine heatwave that pushed the Mediterranean above 33 degrees Celsius off the Spanish island of Majorca , according to data recorded by a buoy operated by the Aemet meteorological agency (source in Italian) . When the first flow of cooler, more unstable air met the hot air masses lingering over northern regions, together with the humidity picked…

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