January 18, 2022 10:30 pm

November 2021 in Spain: radical weather changes, here’s the balance

Fernando llorente 8 min
The Ebro river as it passes through Tortosa, with the castle of San Juan or de la Zuda in the background.
At the Tortosa observatory, on the 22nd, with 125.0 l / m2, the record for absolute maximum daily precipitation was broken. In the image the castle of San Juan or de la Zuda and the Ebro river passing through the city.

The first days of November had the last blows of the instability of October and higher than normal temperatures, even with some record in the lows. The rains were going down a path of scarcity, but during the last days of the month, significant rainfall, mainly in the Cantabrian area, has brought it to near normality in the national average.

By dozens, the first was normal in temperatures, with higher maximums but lower minimums and with somewhat scarce rainfall, except in the Balearic Islands, where the rains have already exceeded normal for the whole month, due to the presence of the high-impact storm Blas.

After the rains went down a path of scarcity for much of the month, the end presented a radical change, with rainfall well above the average.

The second ten had similar characteristics, if possible it was still somewhat drier, except in the Balearic Islands; meanwhile, daytime temperatures remained somewhat high due to the absence of cloudiness due to the anticyclone and which, in turn, made the minimums lower than normal.

Finally, the month is over with a radical change in meteorological conditions, especially in the northern third of the peninsula and in some islands of the Canary archipelago, with rainfall well above average. Thermometric values ​​have been clearly lower than normal in all regions.

Average temperatures below normal

The temperatures Highs have been lower than the usual values ​​for this month in most of the country. The exceptions are found only in the southwest of Galicia, where they have been higher.

Even with the anticyclonic dominance during many days of the month, the change of the weather in the last ten has been able with the autumnal Sun leaving these low temperatures. In stations AEMET, the value highest monthly was reached in the Murcian town of Águilas on day 1, with 31.0 ºC.

The values nocturnal have been lower than normal in most regions, except in areas of the east that have been higher and in the Canary Islands, very close to normal. In AEMET stations, which are not in the high mountains, the data lowest monthly occurred on the 18th, in Morón de Almazán (Soria), with -7.2 ºC. In our mountain systems the values ​​have fallen significantly, with a National minimum in the stations of the Lleida Pyrenees of Cap de Vaqueira and Port Ainé of -13.0 ºC on the 28th.

Volcán del Cuervo, in the Timanfaya National Park, Lanzarote, Canary Islands.
The maximums, in general, have been lower than normal. The Lanzarote airport on the 26th registered the lowest absolute maximum, with 17.5 ºC, beating the previous record that was of 1993. Image of the Timanfaya National Park, Cuervo volcano.

In this month some have been beaten records of lowest absolute maximum and highest absolute minimum temperature. The first of the cases occurred on the 26th at the Lanzarote airport, with 17.5ºC; for the second we can highlight the one recorded on day 1 at the Cádiz observatory, with 20.7 ºC, that is, a tropical night in the middle of autumn.

Average rainfall

My almost normal if we consider the whole of the country, although with unevenly distributed amounts, both geographically and temporally. While It has rained a lot in a few hours and in a few days in almost the entire Cantabrian coast, in the Balearic Islands and on the island of La Palma, with areas that have been around 500 l / m2; on the contrary, in areas of the extreme west of the peninsula, areas of the provinces of Toledo, Murcia, Almería, Granada, Málaga and Seville, as well as in the easternmost islands of the Canary archipelago, rainfall has been less than 10 l / m2.

In percentage, There have been areas in the provinces of Asturias, Cantabria, Navarra, Zaragoza, Tarragona and Alicante, as well as almost the entire Balearic archipelago, where precipitation has exceeded 300% of its normal value, highlighting the Palma de Mallorca observatory, which has reached 458%. On the other hand, in many points of the western and southern extremes of the Peninsula, as well as in part of the Canary archipelago, the rains have been less than 25% of normal.

This month the record of absolute maximum precipitation in one day at the Tortosa observatory, on the 22nd with 125.0 l / m2, surpassing the previous one from 1971.

Final thoughts

We have already passed half of the meteorological autumn, which is the wettest period of the year in most of the country. In a normal atmospheric situation, some Atlantic rainstorm could still arrive, the fearsome Mediterranean downpours almost disappear and everything be replaced by cold eruptions from the north and northwest, in addition to the classic anticyclone of the winter period. It seems that this time the forecasts for the next few weeks they do give slightly higher rainfall than normal in almost all regions.

For the next few weeks, the forecasts do give somewhat higher than normal rainfall. They would be good for us, because the dammed water is 14% below the average of the last ten years.

The situation of scarce rainfall is maintained in areas of the extreme south of the peninsula and in the Canary Islands, which are barely around 25% of their average value of total accumulated annual precipitation. What causes that the percentage of soil moisture over its maximum capacity It is at a scarce 10% in regions of the aforementioned areas.

With this situation, our dams continue with the serious problem of reserves, the dammed water, as of November 30, is only 39.19% of its maximum capacity, 7% lower than the same date last year and we are below the average of the last ten years, in this case just over 14%.

Reference-www.tiempo.com

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