Monday Gayle: What to expect?

Monday Gayle: What to expect?

Way Gilles MatrixClimate scientist

A depression developed rapidly on Sunday evening over the Atlantic, south of Ireland, and passed through northern France on Monday. As it passes, it causes wind and localized rainfall in many areas. Which are the most open areas?

Against the backdrop of low pressure dominating, low pressure is developing rapidly in the southern part of Ireland on Sunday evening. Depressed at 982 hPa (normal low but abnormal pressure), it moved north of France on Monday.

As it passes, it causes winds in the Atlantic regions, with winds blowing at speeds of 80 to 90 kilometers per hour, and on open plateaus and shores at speeds of 100 to 110 kilometers per hour. At sea, waves of 4 to 6 m are expected off the coast of Breton, with elevations of 7 to 8 m between Oleron Island and Lacano. Due to the low tidal coefficients (47 and 50), the likelihood of sinking off the coast during high tide is low.

Here is the chronology of this decay

Monday morning, As the low pressure approaches, the southwesterly winds will reach 80-90 kilometers per hour from the southern coast of Brittany to the bottom of the Biscay Bay.

Monday afternoon, This strong wind is spreading in the western part of France. Near the coasts, the strongest winds are between the Breton coast and the northern part of the land, with winds of 80 to 90 kilometers per hour. Peaks of up to 100 kilometers per hour are possible in the highlands and on the open side. Inland and southwesterly winds intensify at 80 kilometers per hour in the Bordeaux region, Poyto, Charentes and Anjou.

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Monday evening, Strong winds blowing across the Atlantic coast, with speeds of 80 to 90 km / h and locally winds of 100–110 km / h. Inland, north of Limousin, the center winds up to 80 km / h from Poitou-Charentes in the center-val de Lയർrre region. In Brittany, it is the opposite, the wind is weak.

Monday through Tuesday night, The wind is slowly weakening near the Atlantic and over western France. As early as Tuesday morning, it was accelerating between Pyrenees-Oriental, Ode and Harold at 90 kilometers per hour.

Tuesday morning, Strong winds of up to 100 km / h in Russell and Sevens Herald can be observed for a few hours before weakening in the afternoon.

Heavy rain in the western part of Massif Central and Limousine

Moderate to heavy rainfall accompanies this hurricane. As it comes to block on the west side of the overgrowth, the orthographic effect will play out in full, and it will continue to rain from Monday morning until Tuesday afternoon. Throughout this episode of bad weather lasting 36 hours, rain collection is important. Locally, they can reach 100 mm, which is equivalent to three weeks of rainfall. Therefore, the combination of this rainfall and the melting of the snow in the central highlands may cause some reactions from the streams, but with occasional overflows, the floodwaters cannot reach the limit.

In short, this episode of bad weather, which ends Tuesday, will cause a hurricane that is usually marked during the cold season. With the exception of occasional overflows this season, there will be significant rainfall over the western part of Massif Central on Monday morning and Tuesday afternoon, with no risk of flooding.

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