An Atlantic trough looks out to the Mediterranean coast

Autumn has arrived and does it hard. So much so that the Mediterranean coast begins to prepare for an intense episode of rainfall. The culprit (at least in part) is a Atlantic trough that travels the peninsula.

Extreme risk.This situation has led to the State Meteorology Agency (AEMET) to Issue several noticesincluding numerous orange warnings due to important risk and two red notices due to extreme risk. The latter affect a good part of the province of Tarragona, specifically in the southern prelitral and in the southern coast of the Catalan province.

Accumulated rainfall is expected to reach 90 mm in an hour. The red notices will take effect at 15:00 and end at 9:00 p.m., but it must be taken into account that orange notices will last in this area throughout today, as well as during part of tomorrow.

Beyond Tarragona. Aemet yellow and orange notices extend by almost the entire Levante, also covering interior areas, such as the areas of Gúdar and the teacher; Hellín and Almansa; or the safe basin, among others.

Yellow and orange notices not only alert the risk derived from rains but also storm risk. As of tomorrow, orange notices will also reach the Balearic Islands.

What is happening? The agency itself Explain in an informative note that the origin of this event is in an Atlantic trough that Since yesterday we travel our territory. This trough, they explain will originate “a growing instability in the Mediterranean area” during the first days of this week.

However, extreme rains will be the result of the interaction between this trough and “the formation of a bosom of low pressures between the southeast Peninsular and Balearic Islands.” This new formation, continues to explain Aemet, will cause a “wet flow of the east” that will spread through the Mediterranean area.

“The presence of high humidity at low levels together with thermal and dynamic instability, will propitiate the formation of showers and intense storms, in areas of the Eastern Peninsular and Balearic Islands,” concludes the agency in its informative note.

Uncertainty. There is a remarkable uncertainty about the future of this extreme phenomenon, although the models indicate that the situation will come between today and tomorrow, improving from Wednesday. It should be remembered that the notices derived from the situation will still affect the Balearic Islands, so it is convenient to be aware of the evolution of the trough.

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Image | ECMWF / Aemet