A level 3 was issued for N Italy into extreme S Austria mainly for very large to giant hail and severe to extreme wind gusts.
A level 2 surrounds the level 3 mainly for (very) large hail, severe wind gusts and heavy rain.
Einen kleinen Vorgeschmack gab es hier um ca. 2:30 mit einer sehr krätigen Schauerlinie.Not much change to the level 2 over N Italy into parts of Austria/Hungary and Slovenia despite a broad upgrade to a level 3. Some LAMs keep convection attached to the Alps, but this seems unlikely. Apart from the mountains CI will be delayed until the afternoon. Thereafter, long-tracked severe supercells with very large/giant hail, damaging winds (locally in excess of 65kt) and heavy rain are forecast. The tornado risk ramps up in the eastern part of the level 3 with enhanced LL directional/speed shear and rather low LCLs - only the upscale growth into a severe bow echo may lower the general risk a bit (isolated discrete convection still possible next to the N-Adriatic Sea).
There is not much reasoning against this MCS to race trough E-Austria during the night, attached to the progressive short-wave. A general decrease in severe is forecast with weakening CAPE but still impressive shear.
The level 3 was expanded into SE Austria, where a cluster of supercells are forecast during the afternoon/evening (prior to the nocturnal MCS event). (Very) large hail/excessive rain and severe wind gusts occur next to an isolated tornado threat.
We expanded the level 2 more into W Hungary as maturing multicells/supercells from SE Austria grow upscale during the afternoon/evening hours. Large hail/severe wind gusts will be the main issue but an isolated tornado event is possible with deviating cell motion.