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Situation
An episode of very strong lasting heat is set up in the south of the Loire from this Thursday afternoon. This rapid increase in temperatures is linked to the rise in a very hot air bubble from Spain.
Observation
The episode begins this afternoon after an still breathable morning, even in the southern regions. The thermometer will go very quickly in the southwest and especially in the Garonne valley this Thursday.
Evolution
A very hot air bubble will settle permanently in the south of the Loire and maintain at least until the middle of next week. To the north, the heat will remain more moderate, with nights still pleasant, but in the south, between the Garonne and the Rhône to the Val de Saône, the temperatures will be particularly high. This weekend and at the start of the week, the heat wave will focus mainly on the center-east, with a slight decline expected possibly to the southwest.
In the departments on orange alert, the scorching thresholds should be affected day and night for at least three consecutive days. On yellow alert, the days will be very hot but the nights more breathable, limiting the impact on health. This episode, intense but without expected record, could last until August 15, or even a little more in the center-east.
This Thursday:
The morning is still cool. It is in the afternoon that the increase in temperatures is brutal, with more than 30 ° C south of the Loire, and from 35 ° to 37 ° C in the departments placed in orange. The hottest departments range from Gers to Lot as well as in Auvergne-Rhône-Alpes (33 to 34 ° C).
The night from Thursday to Friday will not yet be scorching except in the heart of major cities (Toulouse for example).
Friday :
The heat increases a little and extends to Limousin, the central regions, Auvergne Rhône-Alpes. From 17 to 20 ° C in the morning, temperatures often reach 35 to 36 ° C in the afternoon, with peaks at 38 ° C in the departments placed on orange alert.
The night from Friday to Saturday will be warmer with 20 ° C of minimum observed more frequently (tropical night).
SATURDAY :
Intense scorching heat especially in the center-east. From 19 to 22 ° C in the morning, we expect 35 to 38 ° C in the afternoon until Burgundy and in the Alpine valleys, recalling the situation in early July. The heat does not weaken in the southwest plains either.
The night from Saturday to Sunday will be very hot, often 20 to 22 ° C from minimum to the center-east.
Sunday :
Third day of heat wave in the southwest and center-east. The values remain identical, with always 35 to 38 ° C in the afternoon on the same regions. The southwest could benefit from an attenuation of heat due to the possible lifting of ocean air, which will be specified.
This situation should generally persist at the start of next week, with a significant intensification.