Moving from hurricane to tropical storm, and then back to simple depression, Danielle presents no danger to the French coasts, but produces very hot air from the south.
WEATHER – Floats like deja vu on the thermometer. On 12 and 13 September temperatures will again experience a sudden heat wave: a heat wave that will bring Burgundy and the south-east to 29 ° C, more than ten degrees above the seasonal norm. The main culprit of this phenomenon is Danielle.
The tropical storm that arose in the middle of the Atlantic had worried both sides of the ocean, turning into a hurricane at the beginning of September. Having strengthened in category two, with winds above 150 km / h, Danielle weakened to regress, first to the state of tropical storm, then to tropical depression. But the meteorological phenomenon, if it has lost its name (reserved for tropical storms and hurricanes), has not yet said the last word.
” We can see that it should reach Galicia by Tuesdayspecific to HuffPost, François Jobard, meteorologist of Météo France, after this ride on the Atlantic that took a slightly strange ride “. To the delight of some Internet users, Danielle made an extraordinary comeback around September 7, lighting up. The French coasts, which until then seemed threatened, found themselves out of harm’s way on a much more southerly oriented path, but with an evocative path.
Not by chance in this strange retreat. ” The hurricane encountered a mid-level cold air mass from Canada “explained the specialist, who seriously chilled Danielle.” These high altitude winds interrupt tropical phenomena “, and lower the temperature in the very heart of the storms, which pass from a” hot heart ” has a ” cold heart », And they lose intensity. Still, the heat has really returned.
North African hot air
Even very weakened, even renamed, the ex-Danielle retains an unsuspected power: that of moving considerable masses of air in its path. At the forefront of her arrival on the Galician coast, the air mass pushed by the depression will push hot air from Africa that is currently rising towards southern Spain. ” In the Northern Hemisphere, winds turn counterclockwise “, Specifies the meteorologist. Results, driven by depression, “ masses of extremely hot air will overflow from our street. “
For this we will observe temperatures well – very well – above the norm, throughout France but particularly in the south of the Loire. The weather forecasts for France even predict 30 ° in Savoy on 13 September, where the temperature is usually just above 11-12 degrees … A new heat wave after a summer that has already broken all records for Drought. Be careful, however, not to entrust Danielle with all the responsibility for this new episode.
“ Beware of shortcutswarns François Jobard. We are not talking about hot air coming strictly from Danielle, there is already one burning air that pre-exists “The depression does nothing but raise a mass of air that is moving north.
Likewise, the exceptionally hot season may not be the harbinger of future hurricanes threatening our shores, as Danielle’s existence might suggest. Meteorological phenomena are complex, so François Jobard tempera: the existence of hurricanes in the North Atlantic ” it doesn’t just depend on the fact that we have warmer than normal waters », But also many other parameters. The fact remains that without this scorching summer, no Hurricane Danielle. And without Hurricane Danielle, there is no heat wave.
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