Storm Forecast Valid: Mon 29 Jul 2013 06:00 to Tue 30 Jul 2013 06:00 UTC Issued: Sun 28 Jul 2013 22:56 Forecaster: PUCIK
A level 2 was issued for Northern Italy mainly for large to very large hail, severe wind gusts, tornadoes and to the lesser extent and excessive precipitation.
A level 2 was issued for Northern Austria, Czech Republic and Southwestern Poland mainly for severe to extremely severe wind gusts, large to very large hail and to the lesser extent for excessive precipitation.
A level 2 was issued for Northwestern to Northern Poland mainly for large to very large hail, severe wind gusts and tornadoes.
A level 1 is surrounding level 2´s with isolated events of severe weather possible.
With this day onward, the overall synoptic-scale pattern is going to change quite rapidly. Southern base of the strongly amplified trough over Atlantic will eject from Iberia towards Northern Italy and Central Europe, with strong flow over 20 m/s at 500 hPa surrounding it. With the rapid progression of the trough, strong lee cyclogenesis is simulated behind the Alps in the southerly flow and with increasing PVA, especially over SE Germany and N Austria. The trough of surface low will likely stretch towards Poland, with surface frontal system positioned at the rear of the low. Towards the afternoon and evening hours, surface low will move in accordance with the trough - i.e. towards the northeast. Behind the associated frontal system, which will accelerate substantially (especially its southern part), a ridge will quickly spread into Central Europe with strong pressure gradient.