During the early morning and early hours of this Wednesday, November 5, the arrival of a cold front to the Peninsula has caused a very active squall line throughout the southwest. And, in this case, saying “very active” is not an exaggeration: the images that they come to us from Portugal they are incredible and at the moment, he is heading to Extremadura and Western Andalusia.
The interesting thing is that we no longer talk about meteorological information, we begin to enter the field of
Okay, but what is a squall line? This is an organized storm system that, often ahead of a cold front, forms in a line. Due to its structure, this phenomenon causes strong and destructive winds, torrential rains, hail and lightning. In addition, they are characterized by advancing very quickly and being able to cause significant damage.
And so it has been. Portugal’s Civil Protection recorded more than 150 nighttime incidents and, as the Portuguese press explainedit is not just the problems caused by the rain and wind; is that tens of thousands of electric shocks have been recorded. About 30,000 in a few hours.
Given this, AEMET activated orange noticesin Galicia, Extremadura and Andalusia. In addition, 122 Extremadura is prepared for rains of 5–20 l/m² in very short periods of time. It’s not a lot of water, but in these circumstances it can cause a lot of problems.
Aren’t we talking about autumn showers? No, we are not talking about loose showers: it is an organized convection capable of producing severe gusts, hail and wet blowouts. They are formations that trigger the risk on urban areas, electrical networks and mobility.
It’s another episode of “This is not just an Atlantic storm” that has been with us for weeks now. It is true that November is a typical month for hallways in the southwest; but the data suggests that we are facing something more.
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What is really happening? In technical terms, we are talking about the arrival of an Atlantic trough and cold front with sufficient shear to organize convection and force a quasi-linear system. Ambient humidity does the rest and that is the key.
As we said a few days agothat area of the peninsula is prone to low convergences that, with adequate shear and sufficient humidity,They organize convectively very easily.
As connections with the Gulf of Mexico (the famous ‘rivers of moisture’) become more common and, with them, the available humidity grows: these systems will become more frequent and more intense. It is the same as occurs in the Mediterranean with DANAs: It doesn’t matter if climate change causes more or not, the amount of “available fuel” makes any spark turn into a fire. Meteorologically speaking, of course.
Image | Carlos Virazón
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was originally published in
Xataka
by
Javier Jimenez
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