The great storm has been formed by a process of cyclogenesis in the Atlantic and its effects will be felt as of Thursday.

The rainfall that the Peninsula will accumulate for Saturday.  The time is.

The approximation of an Atlantic storm to the peninsula throughout this week will promote a change of weather with a more autumnal atmosphere, general rains and a drop in temperatures, more pronounced in the western part of the country.

The atmosphere will gradually become unstable in the next few days, but it will not be until Thursday when the rains fall strongly in large areas of Galicia, Asturias, Extremadura and Castilla and León, to gain more intensity and terrain and be extended on Friday and Saturday to practically the entire country.

Will be generalized rains, except in areas of the Balearic Islands, which will also be accompanied by a decrease in the maximums, leaving behind the high temperatures registered this weekend, with maximums between 5 and 10 degrees above normal in large areas, has advanced Ruben del Campo spokesperson for the Meteorology Statal Agency (Aemet).

Forecast for Tuesday, September 15.

In this regard, Del Campo has detailed that on Saturday 38 degrees were exceeded in the Guadalquivir valley, while on Sunday in A Coruña (Galicia) 35.4 degrees were recorded, the highest maximum temperature for the month of September since There are records -in 1930- pulverizing the previous record of 31.5 degrees reached in 2018. Likewise, also at the A Coruña airport it reached 35.9 degrees, and although it has not been a record record, it can be classified as very remarkable.

What is special about this storm?

According, this storm, still far from the Iberian Peninsula, has been formed by a very rapid cyclogenesis process, that is, has experienced a great deepening in a short time. In addition, it is isolated in height, while it has a reflection on the surface, it has been isolated from the jet stream.

Will it have tropical hues?

Recall that jet streams are high-altitude air currents that flow from west to east. We are responsible for the polar jet stream that separates the warm air of the subtropics from the cold air of the pole.. When it undergoes very pronounced undulations it can isolate the air in height.

In this case a tongue of warm and humid air has entered direct to the center of low pressures, so its center is hot and humid, something known as warm seclusion in meteorology.

When this happens the extratropical storm can develop structures similar and reminiscent of the “eye” of a hurricane (Without being a hurricane, this is important. No hurricane is going to reach the Iberian Peninsula). In fact, the US National Hurricane Center currently believes that there is a 10% chance that it will evolve as a cyclone with subtropical characteristics which would imply for example strong associated winds.

What will its effects be?

At the moment this isolated storm It will approach the west-southwest of the peninsula and will bring rain and wind as of Thursday which will be especially strong and widespread heading into Friday when the accumulated can be highlighted to the west of the Central system and in the northwest of the peninsula. The temperatures will also decrease progressively from Thursday so the atmosphere will be rather autumnal. The wind will predominate from the south and east in most of the country with strong gusts in the most Atlantic area.

Which communities will be most affected?

It is difficult after so many days to determine which ones may be more affected but the accumulated could be more important in the north of Estremadura, Andalusia, sure of Castile and Leon, north of the Madrid’s community, eastern mountain ranges Andalusia, inside of Catalonia, north of Aragon, Galicia and south of central Sistem. In the latter, 100 liters per square meter can be exceeded these days.

How long will it last?

The next Monday the rains will still continue in the northern half of the peninsula but on Tuesday the trend will be stability and influence of high pressures and decrease rainfall at least in the southern half of the peninsula and the Canary Islands, which is kept out of the situation.