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Gallery includeLabel msl_an sort comment title MSLP and 12-hour precipitation (short forecast)
From Federico Grazzini:
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After the rainfall 13 September over north-western Italy widespread flash flood has been observed on the western part of the Apennines and historical discharges was recorded on the Nure, and Ceno streams, and also on the Trebbia river that is the largest river of Emilia-Romagna region. Thinking that the Trebbia river (the river is very large, could reach a maximum discharge of 2500 m3/s) has broken the previous historical records by several meters is giving the measure of the amount and intensity of the rain.
The incredible thing is that the precipitation has been generated by a single MCS, classifiable as "V-shape", that formed upstream the Apennines in a warm and humid south-westerly blowing from the Gulf of Genova. It started ad 18 UTC and it lasted approximately up to 6 UTC, just changing shape and moving a little bit, but substantially remained almost stationary. See the picture below taken at 00UTC 14/09/2015. This has generated more than 300mm, recorded by many stations on the upper part of those basins. The precipitation intensity was also striking with 4 stations recording more than 110mm per hour and almost 10 stations recording more than 80 mm per hour. See the map of the total precipitation fallen during the event between 13 and 14/09 over the station network of Emilia-Romagna
Saturday (12 Sept 06- 13 Sept 06z)
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