The Living Force
713mm (2ft 5'') of rain in 12 hours in Liguria, Italy
883.8 mm rain / 24 hours
4 Oct 2021
The peak of those torrential rainfalls in Northern Italy (Liguria) ended up with 884 mm for the 24 hour period in Rossiglione (GE). An amount which is not far away from the national rain record of 948.4 from 7-8 Oct 1970 in Genoa Bolzaneto.
Edit: I just read in another thread ("Dam failures, floods, landslides") that the total-total beyond 24 hours in Rossiglione, where extreme 927 mm. Mama mia....
Typically for the Genoa region are those pesky V-shaped Thunderstorms growing rapidly in from the south/southwest. They often form over the northern tip of Sardinia and then spread explosive, stretching all the way to Liguria. The geography of the area with the mountains and the south-southwest air flow, it all comes together ferociously feeding those V-shaped thunderstorm complexes with huge amounts of energy and humidity, leading to such large amounts rainfalls in that region. Apparently this happens pretty often during autumn (Gulf Of Genova, Liguria).
This system then moved towards
Sicily (5 Oct 2021) yesterday
So, the same system which raved over Liguria on 4 Oct, created day after huge thunderstorms with severe winds affecting the entire island of Sicily before the arrival of the cold front. It destroyed a lot of trees in the Etna-Catania region. A tornado appeared in Augusta. The amounts of rain were rather low, with up to 16-22 mm in the Catania region, and Nicolosi afoot of Etna, saw 28 mm. Nothing really to write home about.
(When I was the first time in Sicily 3-10 Oct 2014, during the first three days the sky was filled with numerous strong thunderstorms very similar to the situation from yesterday & today, but the totals were higher; around 150 mm on the east side of the Etna volcano, while Catania had around 70 mm rain) Yet, I have seen autumn events on the east side of Sicily, in the range of 600-700 mm during 1-2 days in late autumn).
I got reports from Adrano (5 Oct 2021), near Etna in the SW, where large parts of our Italian family lives, that the rainfalls were rather strong (it was here the impulse of a new CB clouds emerged around 15:30-16:00), resulting into floods gushing down the narrow streets of Adrano town... like big times (the streets in the old town are very narrow, leaning downwards). I do not know, if they have a weather station - I have never seen any measurements from there.
6 Oct 2021
Today new T-storms have emerged in the Sicily region but has slided to the southeast (Ragusa, Syracusa, Augusta). The highest preliminary rainfalls are coming from the town of Ragusa with 96 mm (00:00-18:00) Catania reports between 8 and 15 mm rainfalls so far.
Well as our friend said yesterday; autumn has come to Sicily.
Augusta, Sicily 5 Oct 2021
Comiso, Sicily - 5 Oct 2021
Catania, Sicily 5 Oct 2021
Catania, Sicily 5 Oct 2021
East Coast of Sicily (?) 5 Oct 2021
Palermo, Sicily - 5 Oct 2021
Catania City, Sicily - 5 Oct 2021
4-6 Oct 2021, lightning strikes over Europe in the last 48 hours