After several days above the 30 degrees, a refreshment is announced. The end of the heat wave alert is scheduled for Sunday evening for the set, the Lake Geneva and the Valais. It could even intervene already on Saturday evening or Sunday morning, according to Météosuisse. Drought, she will persist for a few more days.
Good news for students and teachers who are preparing to go back to school next Monday: the heat wave is coming to an end. After a new heat peak this Friday – up to 34 degrees around Lake Geneva and in Valais -, temperatures should gradually decrease. As of Sunday, the symbolic bar of the 30 degrees should no longer be crossed in the majority of the regions of French -speaking Switzerland, indicates Weather on its website.
The cantons are therefore starting to announce the end of their heat wave alert. In Geneva, for example, the cantonal doctor’s service will raise the alert this Sunday at 6 pm, and the “high heat” plans can be deactivated. In view of the persistent drought, the canton informs, however, at the same time to raise its level of vigilance with regard to the risk of fire in the forest [lire encadré].
>> Reread: The heat wave strikes Switzerland for the second time this year
Eleven days consecutive to more than 30 degrees in Sion?
Since last Saturday, most of the plain regions north of the Alps have exceeded the danger of degree 3 for a heat wave fixed by Météosuisse, namely 25 degrees of average daily temperature for three days or more.
Although no record was broken, a heat peak was reached Wednesday with maximums of 36.5 degrees observed in Payerne or 36.4 degrees in Geneva. In Sion, the highest average value was recorded on Tuesday (35.6 degrees). If, as the forecast of Friday afternoon forecasts, the temperature again exceeds the 30 degree mark on Saturday, Sunday and Monday, it will have done it for 11 consecutive days.
Particularly marked tropical nights
The tropical nights, rare at altitude, particularly marked this episode of hot weather. For example, he did not do less than 21.2 degrees in the Dôle on the night of Wednesday to Thursday, only the third tropical night recorded at this station since 1973, after that of 2003 and that of 2019.
In Chasseral, the 21.3 degrees noted at the most “fresh” of that night could constitute a minimum night temperature record for this station since 1981. Data must however be analyzed in order to compare them objectively to historical values, underlines Météosuisse on its website.
>> Read also: Thermal stress due to hot weather is harmful to the body
Fabien Grenon
