Showers and storms will regain ground in northeastern Catalonia from Tuesday afternoon, with the possibility of intense episodes and hail in several regions. The change will be accompanied by tramontana, mistral, and fresh easterly winds, which will lower the temperature from that same time of day.
The instability will not be continuous throughout the week, but it will bring a clear shift between the heat of recent days and a more variable scenario. While on Wednesday Barcelona will be around 25 ºC and the warmest areas of Catalonia will still exceed 30 ºC slightly, the most marked drop will arrive between Thursday night and Friday.
On Tuesday, storms with hail return to the northeast
The reactivation of showers will be concentrated on Tuesday afternoon in the northeastern regions. In that area, the forecast points to storms capable of discharging intensely and leaving hail.
The arrival of tramontana, mistral, and fresh easterly winds will be added to this evolution. This wind flow will begin to lower the temperature during the second half of the day, after a first part of the day that will still be milder.
Wednesday will be a transitional day. In Barcelona, the highs will be around 25 ºC, while in the warmest spots in Catalonia, thermometers may still be slightly above 30 ºC.
Thursday's trough will extend storms towards Girona and Barcelona
The main change will arrive at the end of Thursday and will extend through Friday with the arrival of a trough. This episode will favor more widespread storms than those forecast at the beginning of the week.
First, they will affect the Pyrenees and Pre-Pyrenees, and then they will reach regions of Girona and Barcelona. During Thursday afternoon and evening, the storm line will advance towards the coast.
In that stretch, the rainfall may once again be intense and with hail. The arrival of this instability line will also open the door to a clearer temperature drop during Friday.
Barcelona will lose its tropical nights between Thursday and Saturday
One of the most visible effects of the change will be noticeable in the night temperature. The forecast points to the disappearance of tropical nights in Barcelona, especially between Thursday night and Friday and Friday night and Saturday.
That thermal relief, in any case, will not last many days. The meteorological models show a recovery of summer conditions from Sunday and during the next week.
The forecast places the coolest stretch of the week in Barcelona between Thursday night and Friday and Friday night and Saturday, when tropical nights will cease.