A cold air trough, a prelude to the DANA (Isolated High-Level Depression) which will form in the coming days, will leave on Thursday showers of 30 and up to 40 liters per square meter (l/m2) in the central strip of the peninsula. Storms will continue in the north of the peninsula during the weekend, according to the State Meteorological Agency (Aemet).
The deep thalweg will enter the peninsula in the last hours of Wednesday in the west of the peninsula, and will remain practically stationary during Thursday. “The areas most affected by this new DANA, according to current forecasts, would be the central strip of the peninsula and to a lesser extent the west and north,” confirms Roberto Granda, meteorologist at eltiempo.es.
According to Aemet, this trough will bring cold core at medium levels that will be located on the northwest of the peninsula during the central hours of Wednesday. From noon, the Mediterranean breezes will strengthen and important convergences will be established in the upper and middle Ebro and in the neighboring mountainous areas.
Starting Thursday, a DANA will approach Spain. This means that we will see an increase in instability, with strong storms and a notable drop in temperatures in many parts of the country. ⚡️🌧️ pic.twitter.com/Mh1KBu9SOQ
– Eltiempo.es (@ElTiempoes) August 27, 2024
These forcings, together with the high humidity rate at different levels of the atmosphere, will give rise to an episode of showers and thunderstorms. locally strong accompanied by hail in large areas of the peninsula. It is not excluded that these showers will be very strong, as well as very strong gusts of wind. If there is organized convection, Granda specifies, large hail “is not a disposable phenomenon.”
A wide strip from north to south between the Cantabrian Sea and the Guadalquivir Valley will receive locally heavy or very heavy showers – up to 30 liters l/m2 in one hour – with thunderstorms since Thursday morning. Its persistence It can cause significant accumulations of precipitation, greater than 40 l/m2.
In the second part of the day, these storms and showers should extend until peninsula of the northwest and the upper and middle Ebro, the eastern Pyrenees and the north of the Iberian PeninsulaA notable drop in daytime temperatures is expected in a wide band of the interior of the peninsula between northeastern Castile and León and central Andalusia.
From Friday, a DANA will approach the northwest of the peninsula, which will continue the thunderstorms and showers. However, these will most likely be located in the surroundings of the Cantabrian Mountains, the Iberian System and the Central System, where they will continue to be locally strong, without excluding that they extend to the eastern third of the peninsula and the southeast. mountains.
This day and the next, temperatures will gradually rise, although they will remain lower than those expected for these days before the arrival of the trough. Finally, facing the weekend, DANA would move across the Cantabrian Sea as it begins to be absorbed by the general circulation, so There could still be showers and thunderstorms which would be more likely in the northern half of the peninsula.
