A slow-moving storm system will bring rounds of rain to parts of the Mediterranean from eastern Spain to Italy this week.
The repeating rounds of rain will heighten the risk for flooding as the ground becomes more saturated.
The greatest threat for flooding will be on Wednesday and Thursday as low pressure moves across the northern Mediterranean, spreading a period of locally heavy rainfall from northeastern Spain into northern Italy.
Areas from Montpellier to Marseille, Monaco, Genoa and Milan should be on alert for potential flooding.
Total rainfall over 100 mm (4.00 inches) is possible in parts of southern France and northwestern Italy this week.
Downpours and flash flooding could result in numerous travel delays across the region.
The heaviest rain will target areas from Barcelona northward to near Montpellier on Wednesday.
Downpours will then drench locations from Montpellier to Marseille and Nice Wednesday night.
The heaviest rain will then shift into northwestern Italy on Thursday as locations from Genoa to Milan could get 50 mm (2.00 inches) of rain in a six- to 12-hour period.
Downpours could reach Florence by the end of the day on Thursday while gusty thunderstorms and downpours are possible in Rome from late Thursday into Friday.