A cluster of intense storms forms over Ligurian sea – Oct 23, 21:50 UTC
A large cluster of intense storms has formed over the Ligurian sea, just SW of Genova, Italy where a MDT risk areas of DAY 1 Outlook for 23/10/2013 was issued. Latest SFC analysis reveal strong SSE-erly winds along the Ligurian coast, feeding the cluster with very moist and unstable airmass. Given the favourable shear overlaping with instabilty, storms are capable of producing very heavy rain and tornadoes. 40-70mm of the accumulated rain has already been reported around Genova complex terrain in the last 4 hours! Additional heavy rain continues along the southern Alpine flank as well.
Storms should continue forming along the frontal boundary slowly shifting E along the Ligurian/Toscanian coastal areas overnight and tomorrow within the SLGT risk areas of DAY 1 Outlook for 24/10/2013. Expect additional flash floods threat for already affected areas of Liguria and Toscana regions. A maintaining cluster with training effect cells downpouring torrential rain over the same areas could result in dangeorus flooding / land slides conditions given the persistent LL flow and very slow moving frontal boundary there.