Rain could return to the Algarve and Alentejo, starting this Thursday, the 22nd, and until Monday of next week, according to the forecast from the Portuguese Institute of the Sea and Atmosphere (IPMA).
This change in the weather is due to the «passage of a cold frontal surface across the continent quickly», which «will bring rain to the North region, gradually extending to the remaining regions».
«The post-frontal, with which a mass of cold air is associated, will cause a sharp drop in temperature values and, therefore, the occurrence of snow above 800 meters in the North and Center regions», from the end of the afternoon of this Thursday, the 22nd, adds IPMA. There may even be “significant snow accumulation”.
In such a way, that institute has already issued a snow warning for the 22nd and 23rd, «which may need to be extended and/or worsened».
The IPMA highlights that «temperature values in recent days have been above normal for the time of year, but with the expected drop until the 23rd, these will be slightly below normal». After all, it is Winter.
An intensification of the wind is also expected for tomorrow, the 22nd, especially on the coast and in the highlands, with gusts of up to 65 km/h and 85 km/h, respectively.
Maritime unrest will be, according to IPMA, «one of the most significant parameters of this change in the weather».
Thus, on Thursday, the 22nd, an increase in maritime agitation began to be registered on the North and Central coast, later extending to the western coast of Alentejo and Algarve, on Friday, the 23rd.
But the "most serious day" will be the 24th, Saturday, when "waves exceeding 7 meters in height are expected, reaching a maximum height of 14 meters, and with a peak period between 16 and 17 seconds, mainly north of Cape Raso, with the respective warning issued».
The IPMA explains that «this change in the weather is associated with the weakening of an anticyclone that was located to the west of the Iberian Peninsula, allowing the influence of a vast depression region centered in the Iceland region, a region with several nuclei, one of the which is associated with a cold frontal surface that will affect the continent in the coming days».
One of the nuclei of this depression region is the Louis depression, named today, the 21st, by METEO France (French Meteorological Service), as it meets the criteria for its nomination.
This depression will be centered at 52N 02W on the 22nd at 12UTC, mainly affecting the northwestern region of France.
Due to this situation, IPMA advises monitoring weather forecasts and weather warnings.
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