With less than normal rainfall, La Niña will continue to influence February and March
Apart from last week’s rains, which interrupted the process of deterioration of crops and pastures in several areas, it is estimated that we will have the influence of La Niña and less than normal rains for quite some time.
According to consultant Eduardo Sierra, this phenomenon is generally activated in October-November, manifests itself in December and expresses its effects until the end of February, at least, as occurred in the 2008/2009 and 2017/2018 campaigns. Then, in the second month of the year we will have to wait for the continuity of dry heat and irregular rains and less than the historical ones, to return to normal weather only in April. In 2022 the effects of this event are enhanced by the polar winds and the warming of the Atlantic, which diverts storms away from the continent.
Sierra clarifies that the La Niña event is not synonymous with scarce rains throughout South America. It produces rainfall in the Amazon and in a portion of the central west of the Argentine territory, which includes La Pampa and San Luis and the west of Buenos Aires. Instead, it brings less than normal rains in the center-east of the country, in Uruguay and in Paraguay.
For his part, the meteorologist Leonardo de Benedictis recalls that “February is usually a complicated month, which becomes a determining factor in crop yields in many years.” In 2022 it will not be the exception because it will not put an end to the drought and the rains will not fully recover.
“February will continue with ups and downs in terms of rainfall, with important punctual records and localities that will be without water for long periods of time. That is to say, significant humidity pulses will be generated, but they will develop at certain times and places”, he anticipates.
“Although they will be better distributed than in January, when there was a dry first half and a more humid half, they will be convective storms, which can discharge significant volumes in an area, but not in a generalized way,” he emphasizes.
The temperatures will not reach the extreme values of January, but they will be high, although for shorter periods, mixed with normal values for the time, with a lot of variability and abrupt changes. Only at the end of March would the climatic situation begin to normalize, according to the meteorologist.