Thusday, March 7, 2019, 11:30 CET
Storm / heavy rain
Alexander, Bennet, Cornelius
Europa, Central Europe
March 01 to 06, 2019
Satellite image (visible) from March 3, 2019
At the beginning of March, several storm lows swept across Europe in succession. Above all, the United Kingdom, Ireland, the Benelux countries and
Germany were affected. Winterstorm ALEXANDER first swept with gusts up to 181 kph on 02 March 2019 over the UK. Two days later, Winterstorm BENNET followed,
that also produced gusts up to 144 kph in Germany. On the backside of BENNET several squall lines formed over Germany, which also had heavy storm gusts. Directly
after BENNET storm low CORNELIUS followed.
The partly heavy storm gusts and gale-force gusts presented a big danger for the carnival parades, so that some of them had to be canceled. In the carnival strongholds such as Mainz, Dusseldorf and Cologne, they could take place anyway, albeit belatedly. On the frontside of BENNET strong warm air advection took place, so that in some places in Germany again vernal temperatures were reached, such as in Dresden-Klotzsche with 17°C. On the other hand, strong cold air advection took place on the rearside, causing the air to become labil. On the evening of March 05, another low hit the UK. CORNELIUS also brought storm and rain to many parts of Europe.
Deep ALEXANDER was already recognizable on Friday, March 01 as a wave disturbance on the Atlantic in the pressure charts. During the day it developed to a small edge low with a core pressure of 995 hPa. Due to the favorable situation in the zonal jet stream and a dry intrusion it began to intensify rapidly and the displacement speed increased at first. By the evening, the pressure fell to 985 hPa, the displacement speed, however, decreased. By the following day, the pressure in the center dropped to 965 hPa by noon. In 24 hours, the pressure dropped by 30 hPa, which corresponds to a rapid cyclogenesis. The center was now west of Ireland and shifted in the night of Sunday, March 3, towards east-northeast and moved north past Scotland. At night and in the morning, the gusts were the strongest due to the high pressure gradient. In Cairngron gusts up to 189 kph were registered. ALEXANDER made itself felt in Germany by the resurgent wind, as well as a rain band in the northwest. BENNET was not long in becoming noticeable and met the same day in the evening on the coasts of England and Ireland.
On the morning of March 3, BENNET was a wave disturbance with a pressure of 1000 hPa on the Atlantic and developed until the evening to a small very fast-moving edge low. He, too, underwent a rapid cyclogenesis as his pressure dropped by 25 hPa in 24 hours. As well as ALEXANDER, the reason lay in the favorable location in a jet stream branch. BENNET's center moved across the south of the UK and then shifted northeast across the North Sea. In the evening gusts up to 151 kph were measured in Great Britain. The main storm field hit Germany in the early morning of 4 March and there also caused gusts up to 144 kph on the Brocken or Feldberg in the Black Forest. On the backside of BENNET there was strong cold air advection. This led to a labilisation of the air mass and thus to showers and thunderstorms. There were several squall lines. The speed of displacement of BENNET decreased rapidly until the evening and its pressure stagnated at 975 hPa. It remained over the Baltic Sea and slowly shifted northeast towards the Finian coasts. The pressure gradient was slow to fan up so that it still remained stormy on Tuesday.
There was no storm break for the Europe. Already on the evening of March 5, another storm low called CORNELIUS moved on. Stored in a longwave trough it lingered until the 7th of March over Irland and the United Kingdom. Its core pressure was 975 hPa and it shifted only slowly. With it led a cold front, which extends far to the south and formed the trough front. This cold front hit Spain and Portugal during the night from 5 to 6 March and had severe precipitation as well as storm gusts and gale-force gusts. In Spain gusts up to130 kph (la Pinalla) were measured and in 24 hours fell locally more than 76 mm precipitation (Pontevedra, Padron). France also was hit by severe thunderstorms and showers. Gusts up to 162 kph (Mont Aigonal) were measured.
The strong winds were caused by the high pressure gradients. This amounted to 100 km about 12 hPa (1000 km about 38 hPa). In Scotland, gusts up to 189 kph were registered, which corresponds to a category 3 hurricane on the Saffir-Simpson scale. Measured wind gusts (selection) in the United Kingdom (data source: Ogimet):