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It is a story that has been repeated from the beginning of summer: an anticyclonic dorsal will dominate the atmosphere on our heads, which in turn implies the return of heat.
The return to 40º. The next few days will be, again, of extreme heat. The State Meteorology Agency (Aemet) has warned of temperatures that They can exceed 40º in large areas of the South and that could also reach 42º in specific areas of the Peninsular South.
An extreme dorsal again. The person responsible is a dorsal, and a considerable magnitude: 600 DAMMERS (DAM) Geopotential with the center located in North Africa. This means that we have to ascend about six kilometers in the atmosphere before reaching the point where the atmospheric pressure is 500 hectopascal (HPA), when the “normal” value of this altitude would be around 5.5 km.
Although the geopotential in most of the peninsular Spain is rather something above the 594 DAM, this involves “record” levels for this time of year in the southwest peninsular quadrant and part of the center, indicated on Twitter The physicist, meteorologist and disseminator JJ German.
Stability and sun. The dorsals They imply An anticyclonic context that in turn entails stability and clear skies and high insolation. If we add its ability to drag air from North Africa and its recurrence we will see with a situation like this, a summer that has already served to break numerous records in temperature and other atmospheric variables.
Yellow and orange warnings. Temperatures may not reach the levels of previous warm episodes, and the fact that we are already in July (one month on average warmer than June) implies that this geopotential anomaly will not translate into large anomalies. Despite this, mercury will rise enough to Aemet activates various notices associated with extreme temperatures in much of the country between today and Thursday.
The orange notices between today and Wednesday will be concentrated in areas of the center and southwest peninsular: Valleles del Tajo, Guadiana and Guadalquivir, especially. On Thursday, extreme heat will also affect the East, with part of the Ebro Valley, La Mancha Albacete and the interior of some Mediterranean provinces under orange warning.
High maximums and tropical nights. The agency’s prediction For these days they talk about temperatures that “will exceed 38-40 (Grada) in large areas of the southern half of the Atlantic aspect” tomorrow Wednesday, with areas of the Guadalquivir Valley, being able to exceed 42º. The forecasts for Thursday will be somewhat less extreme, although the 35º will be exceeded in most of the southern half and in the northern plateau.
As if this were not enough, the minimums will also remain high: large areas of the south and the Mediterranean basin will see how mercury does not fall from the 20º. Again the Guadalquivir Valley would be the most affected Peninsula area: the minimum could stay here above 25º, that is, we could see the return of the “Equatorial nights”
Change of trend. For now, the dorsals have alternated with tormentous episodes driven by vaguadas, danas or other phenomena associated with a low pressures zone. This week the pattern will be repeated with a thermal relief that will arrive on Friday, accompanied, yes, storms that already concern some experts.
Image | ECMWF
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