Autor/es reacciones

Ricardo Torrijo

Meteorologist of the National Forecasting Center of AEMET

The heat wave that began last Saturday July 9 is associated with a fairly stable weather situation, with a ridge extending from North Africa, thermal, at low levels and high pressure over the peninsula, as well as an isolated depression in height (DANA) centered to the west of the peninsula. This situation, along with strong solar insolation and persistence, is resulting in high temperatures have been rising progressively, both maximum and minimum, reaching its peak yesterday Wednesday and today Thursday.  

The next displacement of the DANA towards the northeast could begin, from the beginning of next week, to alleviate the situation in the far west and northwest peninsular. However, the thermal dorsal will remain towards the east peninsular and could even return to settle again in much of the peninsula. Therefore, it is not clear when this situation may end. In fact, the latest runs of the numerical models (the models are complex computer programs where the behavior of the atmosphere is simulated by means of an infinite number of calculations made by a supercomputer), do not point out when the situation may end, since successive runs extend it more and more in time. 

One of the characteristics of this situation is its great persistence and if it continues at this rate it could become one of the longest since 1975 (the year since there are studies on these episodes). Another point of interest of this heat wave is its extension, since it is exceptional that it affects so many regions. On the other hand, it is also a heat wave that has given records of very high maximum and minimum temperatures, even in some reference observatories with long series. However, from the point of view of thermal records reached, even being a wave of very high temperatures, it does not stand out as much as for the two previous characteristics.  

In any case, before making all these assessments, it will be necessary to wait for the end of the current heat wave, whose end is still uncertain and whose consequences are being felt by the population, since the negative effects on comfort and health of extreme temperatures are well known, as well as for the environment; and for the stress they can produce in various plant and animal species and for the increased risk of fires associated with high temperatures and dryness. 

EN