2023-09-17 00:10:00
Much of the mountainous area of the provinces of Neuquen y Black river was affected in the last hours by «an atmospheric rivera phenomenon that caused intense rains and snowfall, as well as inconveniences such as landslides and flooding in rivers.
This Friday, as a result of the extraordinary flooding of rivers and streams, affected populations of El Manso, Ñorquinco, Río Chico, Comallo and Dina Huapi. On the route to the Samoré Pass there was a landslide that forced the border crossing to be disabled all day Friday and also in Bariloche at night the overflowing of the Medio stream was reported.
The AIC meteorologist, Fernando Frasetto, explained that “we are having, above all, what is the zone of El Bolsón, Bariloche, and the entire Nahuel Huapi area the entry of a frontal system with atmospheric river characteristics. This means a transport of intense water vapor that concentrates precipitation on the surface and also at altitude (in the mountains) persistent and intense. Rains of 100, 200 and even almost 300 millimeters have been recorded between Thursday and Friday in the Limay River basin.
“We see significant flooding in most rivers and streams. We have had snowfall but unlike previous years, frontal rain systems have dominated. He Lake Nahuel Huapi until 10 days ago was one meter from its historical maximum which was in 2006”, he indicated.
Frasetto added that “we have some landslides, landslides and collapses resulting from persistent rainfall almost weekly on the basins, which cause soil saturation. This, added to the drought in this decade with a lack of rainfall and also to the fires that make the soils unstable.”
“Likewise, the large amount of rain that falls in a short period of time and an atmospheric river (the third this winter) generates a lot of rain at altitude in a short time, which washes away the snow, transforming into an instantaneous flow. There is also a very rapid increase in flows as seen in streams and rivers even in more arid areas such as the Southern Region of Rio Negro,” reported the meteorologist.
He recalled that “Phenomena with intensity of precipitation and rain have been recorded especially in 2009, and in 2015 to a lesser extent. Those were two ‘Niño’ years, which is a condition of a warmer Pacific, which also means that there is a greater supply of water vapor and precipitation, which is what has caused it to rain with more intensity and has been expressed in a much more intense way. with these frontal systems mainly of rain over the western Rio Negro region.”
He finally announced that “On the weekend, cold air will enter, the intensity of the precipitation will subside, Cold air enters with snowfall that can reach the cities, drop in temperature, some rain; cold and frost at the beginning of the week where conditions improve.”
On the plateau and valleys, meanwhile, the frontal system was translated with intense gusts of wind, up to 100 km/h in some cases. Problems such as the blowing up of buildings and the suspension of classes due to inclement weather were also recorded here.
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