Note: Forecast as shown is not official

http://www.estofex.org/
+ + + TORNADO OUTBREAK CURRENTLY UNDERWAY ACROSS SOUTHERN AND CENTRAL POLAND AND POSSIBLY SLOVAKIA EXPECTED TO CONTINUE THROUGH THE EVENING + + +
DISCUSSION
S and E Poland... Slovakia... E Czech Rep...
A line of supercells with reported tornadoes are ongoing across a line from just west of Warsaw to Krakow to Bratislava. These are expected to continue during the evening while moving eastward. As a southerly nocturnal low-level jet sets in across the Pannonian Plain and the Carpates, and the pressure gradient increases due to pressure falls east of the Alps, low-level shear profiles are expected to improve further. A continued threat of supercells producing (strong) tornadoes, very large hail and damaging winds is forecast. Storms may weaken no sooner than well after midnight.
First pictures http://www.nto.pl/apps/pbcs.dll/tngallery?Site=NO&Date=20080815&Category=GALERIA&ArtNo=797122456&Ref=PH&Params=Start=1