Inventory of tornadoes in France between 1680 and 1988, according to J. Dessens
Percentage of tornadoes in France from 1680 to 1988 in accordance with their intensities.
Ainsi, la France a connu une quinzaine de tornades de forte puissance (F4 ou F5) depuis 1680, en frappant principalement une bande allant de Bordeaux à Lille en passant par Paris (plus de la moitié) qui est donc la zone la plus à risque, puis il y a le Jura et le Languedoc. Thus, France has been affected by a dozen violent tornadoes (F4 or F5) since 1680, hitting mainly a band from Lille to Bordeaux passing through Paris which is the area most at risk, then there are the Jura and the Languedoc. We observe them with an average frequency of about once every five years. The most common weak tornadoes (F0 or F1) occur on average twice a year by département.
Tornadoes occur in the plains, it is
the reason that there are more to
The frequency of tornadoes in France by department
In Belgium the tornadoes are more common than one would think. They act and often go unnoticed when they occur in the countryside. In 1949, of the writings were found and say that the period of 1880 to 1940 there had been 51 tornadoes. From 1982-2000, 62 tornadoes were reported in the press.
In the United States, the tornado season is in the spring especially in May. 41,58% of them occur in spring, 39,80% in summer, 11,98% in autumn and only 6,63% in winter. As in Europe more than 80% of tornadoes are observed between 12 hours and 18 hours because these are the hours that correspond to the formation of cumulonimbus and after the tornadoes.
In the Southeastern United States (Gulf of Mexico, Florida) and the East coast, we observed them from August to October, which could have links with the hurricanes. These tornadoes in coastal regions are accompanied by many waterspouts.
Created and updated with the data of NOAA
Tornado season in France and Belgium is without dispute in the summer ! The maximum frequency of tornadoes in Europe are the months of June and August as we show the histogram of the number of monthly tornadoes in France and Belgium. Outside the maximum summer (June-August, with 48 events recorded), the tornadoes are quite properly distributed : 24 in autumn (September-November), 15 in winter (December-February) and 20 in the spring (March to May).
Some tornadoes recorded in Belgium during the 20th century according to the sources of MRI
Some tornadoes recorded in France from 1680 to 1988
As shown in the figure below tornadoes of power (F2 and F3) were observed in all seasons.
In France, tornadoes are especially observable between 16 hours and 17 UTC, and between 18 hours and 19 UTC.During the cold period (November-March), the turbulence occurs primarily around noon. But they occur later in the day, between 16 hours and 19 hours during the warm period from April to October, such as thunderstorms.
The histogram distributions and tornadoes
according to hours on the abscissa and