34 inches of rain in 24 hours breaks continental record
By Mary Gilbert, AccuWeather meteorologist
Updated Oct. 6, 2021 4:21 PM EDT
The Bormida di Spigno River in Cairo Montenotte, Liguria, Italy, rose to its banks Oct. 4 after Liguria received half a year's worth of rain in 12 hours.
Parts of northern Italy are recovering from a historic deluge earlier this week that produced a new continent-wide record for rainfall over a 12-hour period and left one city with nearly a year's worth of rainfall in one day.
Rossiglione, Italy, located in the Genoa province, found itself in the absolute worst of Monday's extreme rainfall. The city ended up with a mind-boggling 34.8 inches (883.8 mm) of rainfall over the course of 24 hours.
The annual rainfall total for the nearby city of Genoa itself tops out at just over 42 inches, which is fairly representative for the region at large, according to AccuWeather forecasters. This means that Rossiglione recorded 82.9 percent of the average rainfall that falls over the course of an entire year in the region in just 24 hours.
In order to record rainfall totals that extreme, rainfall rates have to be extraordinary, perhaps even record-breaking.
In 12 hours, from 5:40 a.m. to 5:40 p.m. local time, the city recorded a staggering 29.2 inches (740.6 mm), which broke the record for the European continent,
according to climatologist Maximiliano Herrera.
"That's ridiculous rainfall," AccuWeather Senior Meteorologist Adam Douty said.