The heat wave gives way to explosive weather

After having been suffocated for about fifteen days in a stifling heat caused by a violent scorching episode. Consequently, France sees its sky darkening shortly before the start of the school year. Consequently, A gigantic mass of cold air straight from the Atlantic Ocean came to collide with the burning air still. Similarly, hovering on our territory. Furthermore, The result will result from powerful thunderstorms. Meanwhile. However, hailstorms and the risk of seeing the water from the sky pour out on the soils dry by the ardent summer that we have just suffered.

A cold drop explodes the atmosphere – Heat wave gives way explosive

This Tuesday. Moreover, August 19, officially marks the end of the scorching episode that hit France. Nevertheless, Maximum temperatures fell by more than 15 ° C In several regions heat wave gives way explosive new in a few hours. Consequently, with up to 20 ° C difference in certain places. Nevertheless, heat wave gives way explosive During the night from Monday to Tuesday, there were another 24.8 ° C in Nice and Marseille, 24.5 ° C in Toulon, or 24.2 ° C in Menton. Meanwhile. Night temperatures far too high, real tropical nights, which will have put the organisms of the southerners to the test.

A meteorological upheaval that we owe to a ” cold drop ». An kernel of freezing air located more than 5,000 meters above sea level, which has infiltrated the country from the west. This very cold air pocket suddenly in contact with a hot. humid air mass on the ground, creating what one might call a “thermal shock”.

In reality. meteorologists rather speak of convection : the strong contrasts of temperature. humidity that result from this meeting creates Intense atmospheric heat wave gives way explosive new instability. Said soil contrast contrasts release an immense amount of energy through the condensation of water vapor. thus supplying the heat wave gives way explosive powerful ascending currents. Currents that will then feed future thunderstorms.

From the start of the afternoon this Tuesday. Isolated thunderstorms are starting to burst On the relief of the Massif Central. Over the hours. more active thunderstorms will form on the Cévennes. then move to the Basse Valley of the Rhône in the late afternoon, before reaching the Alps and the Jura in the evening and in the night.

Locally, these thunderstorms will remain almost stationary, with water blades that can exceed 50 mm in an hour. Hailstorms and Gusts close to 90 km/h are also possible under the most active cells.

Too dry floors to absorb water

After the heat wave. the floors are dried up, and completely compacted, unable to absorb these violent heat wave gives way explosive new rains. Violent streams could occur, accompanied by risks of lightning floods and landslides in mountainous areas. Vigilance therefore remainsparticularly in the Southeast. where an evolution heat wave gives way explosive towards an orange thunderstorm alert is not excluded. If you had a hike scheduled this afternoon, you can store your shoes!

The heat will gradually fade through the whole country. The air will finally become breathable againwhether we are in the north or south. 23 to 23 to 28 ° C to the north. and 24 to 31 ° C in the southern regions, according to the data provided by Météo-France.

This week’s weather situation is The direct consequence of the different episodes of heat wave that we have gone through. In a country characterized by a temperate climate like ours (although it is increasingly altered by climate change). the accumulation of heat in the low layers Creates explosive atmospheric heat wave gives way explosive new instabilities As soon as an atmospheric altitude change. is invited. A reality that we must now accept: our summers will be more and more chaotic. In the kingdom of extremes, heat wave gives way explosive Climate moderation has abdicated !

• A mass of altitude cold air caused a violent change in the weather after the heat wave. with locally intense storms.
• Diluvian rains fall on soils hardened by heat, increasing the risk of rapid floods, landslides and floods.
• This type of brutal transition becomes more and more frequent in France, a tangible sign of climate change.

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