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The climatological autumn ended (the climatological winter began on December 1, not the astronomical winter that only begins on the 21), marked by several days of anticyclone, but also by the cold drops and the Clemente depression. The beginning of the climatological winter almost coincided with the beginning of the Dora depression, a storm that promises to bring very adverse weather for the next few days, especially tomorrow, Friday, December 4. It will be one more reason to remain confined this long weekend by the state of emergency until the feast of the Immaculate Conception.
The forecast for wind, rain, cold and snow announced a few days ago is confirmed later this week. This storm becomes the Dora depression, named by the National Meteorological Service of Spain (AEMET), becoming the fourth storm of the 2020/2021 season from the Southwest European group.
The snow is coming ️️ and will fall from the next morning in the North and Central interior (above 1400 meters), gradually lowering the quota to 600 meters.
Attention to those accumulated in Serra da Estrela.
️ See the models section: https://t.co/chjbHP1LT6 pic.twitter.com/4AQLbhzJ6s
– Measured | Tempo.pt (@MeteoredPT) December 3, 2020
Cold, snow and wind
The effects of the cold frontal surface associated with this storm will begin to be felt today in our territory (3), with the intensification of the wind from the north and northwest quadrant in the next hours, entering from the north of continental Portugal. In addition, it will be accompanied by light rains and very cloudy skies throughout the country.
According to the ECMWF model, in the early hours of Friday the first snowflakes begin to fall in some of the northern and central mountain systems, initially at the level of 1400/1600 meters, gradually descending to 600 meters. It will snow in places like Peneda-Gerês (Serra Amarela), Serra do Marão, Serra do Alvão, Serra da Estrela, among others. The accumulated will be interesting especially in Serra da Estrela.
Depression #Dora come tomorrow #Portugal continental ️
Its effects will begin to be felt today through the #wind which will intensify in the coming days with gusts of up to 80 km / h on the west coast and up to 95 km / h in the mountains ️
️ Maps: https://t.co/3eR5ice3Kt pic.twitter.com/XZEVjxBqTC
– Measured | Tempo.pt (@MeteoredPT) December 3, 2020
The cold frontal surface will cross the entire continental geography, leaving Generalized precipitation, sometimes in a moderate regime and with greater accumulations in the Miño and Duero Litoral regions. It will also be accompanied by a sharp drop in temperatures, and at various points in Trás-os-Montes and Beira Alta, thermometers will indicate minimum temperatures of -3 ºC. The wind will blow moderate, sometimes strong, with maximum gust of up to 80 km / h on the west coast and up to 95 km / h in the northern and central highlands.
For this Friday orange notices were issued for the north coast and red notices for the districts of Leiria and Lisbon.
The sea very rough and the instability continues in the following days
In addition to the atmospheric instability generated by the fall in rainfall, sometimes in the form of snow, the strong winds from the north and northwest quadrant and the sharp drop in temperatures, Dora’s depression will also have a major impact on the turmoil of the sea. For this reason, for this Friday orange notices have already been issued for the entire north coast and red notices for the districts of Leiria and Lisbon.
The waves from the northwest will have a significant height of 7 to 8 meters, sometimes reaching an impressive 14 meters. and endangering the coastal towns of these districts.
Saturday is expected greater drop in temperatures, accompanied by a very intense northwest wind that will increase thermal discomfort. Rainfall will be scarcer and will spread irregularly throughout the territory. In principle, on this day it should no longer snow in mainland Portugal, but the intense cold will persist, appearing also in the form of ice and frost.
As of Sunday, a new front, associated with another storm, should begin to approach our country, The most unstable days are expected to be Monday (7) and the Immaculate Conception holiday (8)..
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