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Heatwave: what is the galerne, causing a sudden drop in temperatures in the Southwest?

2022-06-18T17:10:22.529Z


This meteorological phenomenon, known in the Basque Country as "brouillarta", will cause a sharp drop in temperatures in space.


In one hour, this early Saturday evening, the south-west of France will be delivered from the heat wave.

The inhabitants of Pyrénées-Atlantiques and Landes owe this sudden cooling to a powerful wind coming from the West, called the galerne, indicates meteorologist Guillaume Séchet.

In these two departments, the temperature will suddenly drop by almost 20 ° C in places, while they were affected by high heat like two thirds of the country placed in orange or red vigilance.

An impressive blow from Galerne (intrusion of the West wind) should cause the thermometer to drop by almost 20°C in one hour (!) at the start of the evening in the Basque Country and the Landes, ending the #heat wave on these sectors.



Arome model via @meteociel pic.twitter.com/aeENIVt9z3

— Guillaume Séchet (@Meteovilles) June 18, 2022

A little earlier, this wind has already cooled Santander, in Spain, where it was no more than 20 ° C on Saturday afternoon.

20°C difference between Santander #Spain where it is only 20°C with westerly winds and the #Basque Country and #Aquitaine where we exceed 41°C.


The westerly winds will enter suddenly on the French side at the end of the day, causing the temperature to drop by 15/20°C.

#galerne pic.twitter.com/L9uvRELHy4

— Keraunos (@KeraunosObs) June 18, 2022

Known in the west of France, in particular on the Basque coasts, this meteorological phenomenon takes different names depending on the region: "brouillarta" in the Basque Country, "gwalarn" in Brittany, lists Ouest-France.

Whatever its name, whose origin is Spanish, it is a sudden wind (temperature drop in about twenty minutes), cold and wet.

The galerne, meteorological name used by Météo France, is a phenomenon “characteristic of the south-east of the Bay of Biscay”.

Bay of Biscay

Biarritz will lose 20°C in one hour

It is characterized in particular by a sudden drop in temperature (from 12 to 15°C), a rapid rise in humidity (towards 85 or even 90%) and a "violent" rotation of the wind associated with a "sudden increase" in its speed, all "almost simultaneously and in a few minutes".

The phenomenon is spreading from West to East, specifies the meteorological forecasting institute.

“In some cases, galern may be accompanied by precipitation.

It suddenly interrupts a period of calm weather, generally sunny and warm.

“The galerne arises most of the time between May and October, “three to four times a year on average (always in Biarritz), for a duration most often between one and three hours, the wind generally remaining in the West.

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Read alsoFollow our direct heat wave

Thus, the cities of Pau and Tarbes, which saw the thermometer climb to 40 ° C in the afternoon, will drop to 31 ° C in the evening then 20 ° C at night, indicates Franceinfo.

In Biarritz, the temperature will drop from 42.9°C to 23°C, and it will drop by 10°C in Saint-Jean-de-Luz (from 38°C to 27°C).

Source: leparis

All news articles on 2022-06-18

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