Saturday, December 4

DANA leaves in 20 minutes the normal rain of all September in Toledo and other storm records


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While the alert for heavy rains continues this Thursday in 28 provinces, the first meteorological records already indicate that in many parts of the country rainfall has been record. They were fast and very intense. So much so that in Daroca (Zaragoza) it has been the rainiest day since there are records and, in Toledo, the storm discharged the normal rain of the entire month of September in 20 minutes.

Although the usual torrential rains associated with a DANA (Isolated High Level Depression) is that they hit the Mediterranean area, this time in the central area of ​​the country it has not been spared either. The spokesperson for the State Meteorological Agency (AEMET), Rubén del Campo, highlights the 95 liters per square meter (l / m2) collected in the observatory of Daroca, in the Iberian mountain range in Zaragoza. «43 of these liters were collected in just one hour and they turned September 1, 2021 into the rainiest day in that town since there are records, “he explained. The town has data for more than a century.

But it was not the only one. In the Navarran town of Tudela, on the banks of the Ebro, and in the whole of the southern half of Navarra, this Wednesday was the day “with the most precipitation as a whole in the last fifty years, taking into account all the months of the year,” according to Del Campo.

In the downtown area, a storm in the early hours of Tuesday to Wednesday left 32.5 liters per square meter in the Retiro observatory in Madrid, which turned it into the most intense storm for an August month since 1947. Although the storm occurred in the early morning of September 1, it is considered that it took place on August 31 because it is spoken of as a pluviometric day and the pluviometric day, instead of going from zero to twenty-four hours like the calendar day, it ranges from the nine in the morning of one day to nine in the morning of the next day, explains the spokesman.

In 20 minutes

Also in the provinces of Cuenca, Guadalajara and Toledo, there were extremely intense showers, as in the case of the Toledo capital. In the city of Toledo, about 20 l / m2 in less than twenty minutes, when the normal thing for the whole month of September is to collect 18 l / m2. In the Toledo town of Ocaña, 10 l / m2 were collected in just ten minutes. “These intense precipitations in a short time cause many problems because large floods and pools of water are formed,” says Del Campo.

In the Mediterranean area there was also heavy rainfall. For example, in the town of Freedom, in the province of Valencia, were overcome throughout the day on Wednesday los 90 l/m2 and in the early morning from Wednesday to Thursday there were also showers of very strong intensity in the peninsular Mediterranean provinces and even in some parts of the Balearic Islands these showers have reached torrential intensity.

On the other hand, Del Campo has explained that all these rains and showers have been accompanied by a great electrical activity atmospheric. Thus, the lightning detection network accounted for a total of 41,000 lightning strikes in the whole of the Peninsula and the Balearic Islands, although the spokesperson pointed out that this figure “is far from the total record of over 200,000.”

In any case, it has indicated that “it is very high for the month of September taking into account that most of the lightning came from storms formed in the interior of the Peninsula.”

Climate change

On whether these episodes may be more frequent as a consequence of climate change, Del Campo has explained that for now, it cannot be certified that DANA is due to climate change until there is a study in this regard. «It should be noted that, in the case of rainfall, attribution studies are complicated because rainfall is very irregular: there are periods of drought interrupted by heavy rains and this makes it difficult to carry out attribution studies ”, he emphasized.

In any case, it has specified that «in this context of climate change, these extreme atmospheric phenomena are already more frequent and if the projections are fulfilled, they will continue to be in the coming years». And he added: «In Spain it is already being observed that some points, especially on the Mediterranean side, the days with torrential rain are more intense and that the periods of drought are longer and are interrupted by periods of intense rainfall. And this is being detected, especially the latter, in many parts of the southern half.

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