112 liters per square meter in one hour. That is the data that the Cartaya meteorological station, on the Huelva coast, registered during the morning of September 23. Torrential rain associated with a system of storms that had been forming in the extreme southwestern corner of the Peninsula since early Thursday morning. The DANA (isolated depression at high levels) that began to affect a large part of the Andalusian territory since Tuesday afternoon, has been increasing the intensity of rainfall and storms that have developed as the center of the low has isolated and centered off the Portuguese coast.
Rain and high tide cause floods of almost two meters high on the coast of Huelva
The intensity of the rainfall forced the State Meteorological Agency to raise the warning for rains in one hour on the coast of Huelva to red after having registered peaks of more than 60 liters per square meter in one hour between the mouths of the Guadiana and the Odiel. Towns such as Lepe saw their streets turned into rivers, accumulating more than 400 incidents of flooding in the entire area in just over two hours, forcing the Delegation of the Junta de Andalucía in Huelva to activate level 1 (the second on a scale of four) of the Emergency Plan for Flood Risk.
DANA marks the first steps of astronomical autumn
The announced stability with which summer was going to say goodbye was blown up in the first steps of astronomical autumn. The position of the DANA, fed at first by the humid flow of the Mediterranean, and later by the Atlantic, has been triggering the formation of showers and storms since the middle of the week in most of the Andalusian territory. This will continue to do so until the middle of the weekend, when as of Saturday afternoon the low is integrated into the general atmospheric circulation to give way to anticyclonic weather.
The storms and torrential rains will continue between the afternoons of Thursday and Saturday, moving towards the eastern half with the passage of the days with a tendency to subside. Thus, while between Thursday afternoon and Friday the western half of the region will be the most affected by rainfall, during Saturday they will be relegated to the eastern third. Especially abundant and intense will be those that can be registered on the Mediterranean coast, being able to accumulate more than 50 liters per square meter in a few hours in some points of the Costa del Sol during the early hours and on Friday morning.
Anticyclonic atmosphere since Saturday afternoon
Although from Friday afternoon the western Andalusian third will notice a significant improvement, it will not be until Sunday when the stable environment is generalized throughout the Community. By then the momentum of the anticyclonic ridge will keep the skies very slightly cloudy or clear, initiating a period of stability that will last at least until the following weekend. The last days of September will be marked by the sun and relatively warm temperatures.
The greater stability and the push of the warm air in height will raise the thermometer again above 30 degrees in most of the Andalusian interior from the afternoon of Monday, September 27. This increase in temperatures will continue during the rest of the week, reaching a peak between Tuesday afternoons and Wednesday when the maximums may exceed 33 degrees in the Guadalquivir valley. They will be somewhat lower in the rest of the region, oscillating between 27 to 30 degrees that are registered in the early afternoon both on the coast and in average levels in the interior of the region. The lows, for their part, will remain relatively cool during the next few days, consolidating around 14 to 16 degrees in the interior and 17 to 19 degrees on the Atlantic and Mediterranean coasts.