A level 1 was issued for parts of the North Sea and the near coastal areas of the Netherlands as well as the East and West Frisian Islands, mainly for tornadoes.
...North Sea and the near coastal areas of the Netherlands and the Frisian islands...
Under the center of the upper level low quite weak mid and upper level winds are present. With the available cold airmasses quite steep mid and low level lapse rates are present whereas the latter is mainly due to the warm ocean and daytime heating over land, respectively.
This finally leads to robust LL CAPE values of more than 100 J/kg that enhance significantly the threat for waterspouts. The risk area is mainly coupled to the time of the day and the sea breeze front. During night the waterspouts should mainly be active over sea, however during the day also the coastal areas of the Netherlands and the Frisian islands are under the threat level, when the sea breeze front moves inland.
The overall threat travels with the upper level low slowly eastward during the forecast period.
...North Sea and the near coastal areas of the Netherlands and the Frisian islands...
Under the center of the upper level low quite weak mid and upper level winds are present. With the available cold airmasses quite steep mid and low level lapse rates are present whereas the latter is mainly due to the warm ocean and daytime heating over land, respectively.
This finally leads to robust LL CAPE values of more than 100 J/kg that enhance significantly the threat for waterspouts. The risk area is mainly coupled to the time of the day and the sea breeze front. During night the waterspouts should mainly be active over sea, however during the day also the coastal areas of the Netherlands and the Frisian islands are under the threat level, when the sea breeze front moves inland.
The overall threat travels with the upper level low slowly eastward during the forecast period.
