Loading ...Xynthia storm explained.
Unique combination of factors to explain the heavy toll: tides, storm and the fact that it occurred at night, surprising many resident during their sleep.
The presence, much farther south than usual of a cold current on high altitude (jet stream) with low layer of a large mass of hot air is the cause of the storm that hit France this weekend.
The storms are fairly normal in February in France, but this one is of a magnitude and intensity far above what is usually observed.
These storms can be explained by the combination of a jet stream on high altitude, with westerly very high speed winds, and a mass of warm air at low level, at 1500 meters of the atmosphere. The interaction between thermal conditions and warm anomalies in the lower layer leads to a widening, ie a decrease of pressure, and the formation of a depression or cyclogenesis.
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