The situation winter recrudecerá this week. According to the State Agency of Meteorology (AEMET), today, Tuesday 17 of January begins a cold that will last at least until next Thursday, 19. But, what are the differences between this front and the typical temperature of the first season of the year? What never had been given a wave fleece of this type? Explain in five keys the event the weather that will mark the next few days.
What exactly is a cold wave?
Although there is no exact definition of cold wave, the AEMET explains that it is an “episode of at least three consecutive days, in which at least 10% of the stations considered recorded minimum below the percentile of 5% of the series of minimum temperatures daily for the months of January and February for the period 1971-2000″. The imprecision when speaking of this type of phenomena of rides polar bears to which, in many cases, overreact to the weather situation.
The cold spell should be kept for at least three consecutive days with temperatures lower than the lows recorded usually
“In winter it is normal cold and can we not talk about cold wave, when temperatures, though still low or even very low, are relatively common in the winter period”, to clarify from the agency. For example: if we look at the municipality of Molina de Aragon, located in Castilla-La Mancha, 40% of the winter days are recorded minimum below -4 ° C, and 20%, below even -7ºC. However, in Seville, the opposite happens: the temperature and the absolute minimum determined until the time was of-5.5 ºC. If the minimum is -7ºC in the city of seville, yes could be part of a wave of cold.
why is this phenomenon?
From Tuesday, January 17, will also introduce a new mass air cool and dry, of continental origin, as a result of a flow of the north-east caused by the low pressures in the Mediterranean and the high pressures in the interior of the european continent. To which may be characterized as a wave of cold, the researchers analyzed four values: the duration of the episode, the number of affected provinces, the minimum temperature and the anomaly of the own wave.
Forecast for Tuesday, January 17. Source: AEMET.
The coldest day will be Wednesday, according to the forecast of the AEMET.
The situation Thursday, according to the AEMET. Starting Friday, temperatures will soften and will increase the height of the snow.
The effects of the cold wave
With the exception of coastal areas, there will be frost in almost the entire Peninsula. According to the estimates of the AEMET, the minimum temperatures in mountain areas (Pyrenees and Iberian System) will be less than -10 ° C, even at -15ºC. In the greater part of the territory of the peninsula, the maximum temperatures shall not exceed 5 ° c, especially the Wednesday, considered the coldest day. On the 18th of January, there is expected precipitation in the Balearic islands and in the southeast heights very low, which could reach to the level of the sea in these regions.
on Wednesday 18 January will be the coldest day, with frost widespread and even snow in the east and southeast of the iberian peninsula and Balearic islands
The AEMET expected to have snowy copious in the east and southeast of the Peninsula, as the flow of air will be more humid. According to their analysis, there could be snowfalls weak, even in the centre of the peninsula. From Friday 20 of January, temperatures will be easing as a result of the end of cold wave. However, experts warn that temperatures will remain quite low, with what might have frost widespread, but less intense. What is more likely is that the coat of snow also climb from Friday, 20.
what Is the worst episode of winter?
Or a lot less. An investigation by the Service of the National Bank of Climatological Data evaluated cold waves since 1975. The two worst episodes occurred in the winter of 1980-1981, and the winter of 1975-1976, with a length of 31 and 22 days, respectively. The scientists determined that in certain periods even did not register any wave of cold.
it is Not the worst cold wave recorded to date. By contrast, there were winters in which you have not happened to these climatic phenomena
The hardest winter he lived between 1944 and 1945. During that season, were recorded minimum temperatures of -21,2 ° C in the Observatory of Daroca (Zaragoza), -19ºC in the Observatory Burgos/Villafria, -17,4 ° C between Leon and Virgen del Camino, -16,8 ° C in Reinosa (Cantabria) and -15,5 ° C in Albacete/Los Llanos. That winter was also the lowest value recorded in the station of Madrid-Retiro, with a minimum temperature of -10,1 ºC. That cold wave was divided in two episodes in a row of ten to twelve days. Anything similar to the phenomenon arrives in Spain this week, fortunately.
Recommendations to follow
Before the drop in temperatures and possible snow, the tips most common are based on use public transportation and dress well, to remain attentive to areas of frost to prevent falls and, in the case of the use of the vehicle, to make sure that the tank is full and carry chains if surprised by the snow. In that situation, you will be driving without maneuvers, sharp, reducing the speed and turning on the lights, and try to circulate on the main roads.
Dress well, use public transport and drive with caution are some of the tips to follow during the next few days
On the domestic level, the authorities recommend not placing heaters close to furniture and curtains, or put clothes out to dry on top of braziers, make proper use of the heating and unplugging appliances that are not needed. The ideal is that the temperature of the house is maintained between 20 and 22 ° C, ventilate the rooms and to take hot drinks, avoiding alcohol, which dissipates body heat. In the case of frost, you can always run a thread of water so that you are not eileen, the pipes of the home.
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