Storm Forecast
Valid: Thu 04 Jun 2026 06:00 to Fri 05 Jun 2026 06:00 UTC
Issued: Wed 03 Jun 2026 21:24
Forecaster: PUCIK
A level 2 was issued across NW and N Germany mainly for severe wind gusts and tornadoes, including a potential for a strong tornado.
A level 1 was issued from N France through BENELUX into Germany and S Scandinavia mainly for severe wind gusts and tornadoes.
A level 1 was issued for Catalonia mainly for severe wind gusts and to the lesser extent large hail or heavy rainfall.
A level 1 was issued for Albania and W Greece mainly for heavy rainfall, large hail and to the lesser degree for severe wind gusts.
A level 1 was issued for S Romania, Bulgaria and N Greece mainly for heavy rainfall and large hail.
A level 1 was issued from Romania to E Slovakia and Poland mainly for heavy rainfall.
DISCUSSION
... France through BENELUX into NW and N Germany, Denmark and S Scandinavia...
A deep trough approaches the region from west with short-wave troughs moving on its forward flank towards northeast. Synoptic-scale lift is forecast across the area in the late morning to afternoon hours with the strongest lift over Denmark and Norway. Closer to the surface, a diffuse cold front will translate east. No strong signal in the low-level convergence is noted. Thus, no widespread mesoscale lift along the front is expected with the most likely coverage being (widely) scattered storms. Given modest low-level moisture and mid-tropospheric lapse rates, MLCAPE will stay mostly between 200 and 600 J/kg. Across central to northeastern Germany, steep low level lapse rates are forecast. Storms will be mostly low-topped with EL increasing towards the afternoon and west as the mid-tropospheric temperature drops with the arrival of the trough.
Strong vertical wind shear is forecast across the whole region, with 0-3 km bulk shear between 15 and 20 m/s and 0-1 km bulk shear up to 15 m/s locally. Especially over NW and N Germany, high-resolution models pick out mesoscale areas of strongly curved hodographs with large fraction of streamwise vorticity in the inflow to the storm and 0-500 m SRH exceeding 100 m2/s2. Combined with low LCLs and steep low-level lapse rates, there will be an enhanced threat of tornadoes with low-topped supercells and short linear segments. Given impressive kinematic setup, some of the tornadoes could become strong. Besides the tornadoes, severe wind gusts may occur in the downdrafts of the supercells.
Level 2 was introduced for the area, where several waves of low-topped supercells/linear segments are possible and high-res models give the highest low-level SRH values. A primary failure mode for this scenario would be that the lapse rates in the lower troposphere are worse than forecast, yielding lower CAPE, weaker lower tropospheric updrafts and thus also potential for vertical stretching of the ambient vorticity.
... Catalonia ...
A fast-moving short-wave trough will approach the region with storms forming over the mountains and then spreading further southeast. Forecast profiles show rather skinny CAPE profiles but long linear hodographs. Marginally large hail and severe wind gusts may accompany stronger storms.
E Poland towards E Hungary, Romania, Bulgaria and N Greece ...
Very moist profiles with weak mean flow point to the enhanced threat of heavy rainfall with storms, especially in the areas with complex terrain. In S Romania and Bulgaria, higher values of CAPE also point to the local risk of marginally large hail.
... Albania, W Greece ...
Stronger vertical wind shear is forecast here compared to the rest of SE Europe with 0-6 km bulk shear around 20 m/s especially in the morning hours. Stronger storms may be accompanied by large hail and severe wind gusts besides heavy rainfall. Both CAPE and shear will decrease in the afternoon hours.
