By Quentin Marais
Heatwave vigilance is cumulative in France, during a summer of 2022 which is, unquestionably, that of the heat, throughout France. If the days are hot, the nights are sometimes just as much. What about since the beginning of the meteorological summer?
13 tropical nights
Météo France distinguishes a warm night by qualifying it as “tropical”. This is when the minimum temperature does not drop below the 20 degrees. Since 1uh June 2022, which marks the beginning of the meteorological summer, Toulouse taking into account 13. “In particular, there have been June 15 to 19during red vigilance, then a few in July between the 14th and the 25th“, indicates Météo France to Toulouse news. For the moment, if the beginning of August is hot, with a new orange heat wave vigilance in Haute-Garonne, “there is not yet a tropical night. It was rather marked on previous waves heat “.
A “regularly large” number
How does 2022 compare to other years? In 2003, 28 tropical nights were designated by the Toulouse Blagnac station, during the entire meteorological summer. So from 1uh June to August 31. It’s the record. ” There were 22 in 2017, and 19 in 2019“, adds Météo France. Who warns, although two thirds of the season have passed: “Summer is not over”. And it still allows us to draw a conclusion.
“Overall, the number of tropical nights, in recent years, is still regularly high in Toulouse. There is an accumulation that there was not 20, 30 or 40 years ago. In the first three ranks of the ranking , we still have years that are recent, we mainly find high values between 2010 and 2022. Before, there is not much…”
The effects of heat islands
If Météo France only notes 13 tropical nights, certain minimum temperatures appeared, however, well above 20°C, in Toulouse. The meteorologists justify it: “We don’t have a station in the heart of the city centre. The measurements could be biased because there are heat islands. People who live, overall, in the center, feel a warmth which is most certainly greater than 20 the night. »
On the night of July 21 to 22, 2022, a nocturnal heat island had also been noted in Toulouse, and reported by a colossal difference on the thermometer: five degrees apart were then observed between the urban area and the rural area!
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