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Italy, France: Flooding rain to threaten Italy and southern France into Friday

A slow-moving storm system will bring the risk of flooding rain and gusty thunderstorms from southern France to Italy into Friday.

Heavy rain earlier this week has already left the region more susceptible to flooding.

Areas from Monaco to Genoa and Milan should be on alert for potential flooding with the most severe flooding expected across northwestern Italy.

Widespread and severe flooding issues threaten to unfold across northwestern Italy as the downpours persist into Friday.

“Areas along the southern and southeastern slopes of the mountains in northwestern Italy could get 24-hour rainfall totals ranging from 100-200 mm (4-8 inches) Thursday into Friday morning,” Kristina Pydynowski said. “Genoa and Biella could be at risk for such excessive totals.”

“Widespread flooding and mudslides threaten to ensue,” she said. “Rivers will overflow some banks, further flooding neighboring communities and damaging bridges.”

Substantial snow will bury the higher terrain in the mountains.

The heavy rain and flash flooding may result in numerous travel delays across the region.

“Even in areas that flooding does not occur, the downpours will create hazards for motorists by reducing visibility and heightening the risk of vehicles hydroplaning when traveling at highway speeds,” Pydynowski said.

Downpours could reach Florence by the end of the day on Thursday while gusty and drenching thunderstorms will target Rome Thursday evening into Thursday night.

“It is not of the question for an isolated tornado to get spun up along the central Italian coast, including around Rome,” Pydynowski stated.

Drier weather will return to northwestern Italy Friday night into Saturday as the downpours focus on southern Italy and places along the eastern coast of the Adriatic Sea.