Segregated low could bring waterspouts, tornadoes and snow to these regions of the country

May is one of the months in which the most tornadoes have been recorded in the national territory. That is why paying attention to this type of atmospheric configurations is of utmost relevance given the possibility of such events occurring.

Reina Campos Caba 05/13/2024 15:23 5 min

We are going to begin this weather news with the warnings issued by the Chilean Meteorological Directorate (DMC) for this week.

The first of them, valid until Thursday night (May 16), takes us to the regions of Antofagasta and Atacama due to the displacement of a jet stream which will continue to cause moderate to strong winds in the sectors of the coastal mountain range, foothills and Andes mountain range.

Over the Atacama Region (Andes mountain range), snowfalls, blizzards and wind gusts exceeding 70 km/h between Wednesday (May 15) and Friday (May 17).

The segregated discharge, which is located over the Pacific Ocean, maintains a weather warning until Tuesday night (May 14) in the Juan Fernández Archipelago for probable thunderstorms and hail.

Segregated low expected for Chile will be the protagonist of the week with rain, snow and possible electrical storms

Segregated low expected for Chile will be the protagonist of the week with rain, snow and possible electrical storms

High pressure cold features generated a weather warning for the Aysén Region (northern subandean Patagonia sector), whose validity extends until Tuesday morning, due to normal to moderate frosts.

Attention! Waterspouts and tornadoes could be recorded in these regions on Thursday

The beginning of this week has been marked by the positioning of a high pressure of cold characteristics that dragged polar air into the country. As a result, this Monday morning (May 13) negative minimum temperatures were recorded from the Region of La Araucanía to the Region of Aysén.

In this sense, it is important to highlight that the meteorological frosts will extend until Wednesday between the regions of Ñuble and Los Lagos, while this atmospheric condition will continue until Friday in the Aysén Region.

Geopotential height 500 hectopascals ECMWF
Our reference model projects that the maximum development of the segregated low will be recorded between the night of Wednesday (15th) and the early hours of Thursday (16th), as seen in the green circle over south-central Chile.

Subsequently, and considering the update of the model of the European Center for Medium and Long Term Forecasts (ECMWF) the protagonism will be taken by the segregated leave, which will develop from a high valley -corresponding to 500 hectopascals or 5,500 meters above sea level- whose core would reach its maximum development between Wednesday night and Thursday morning.

It is projected that segregated discharge achieve maximum development on the geographical stretch that covers from the Ñuble Region to the Los Ríos Region.

This synoptic configuration would arrive with snow showers and wind gusts around 60 km/h over the Andes mountain range on Wednesday between the regions of Coquimbo and O’Higgins.

ECMWF Wind Gusts
Wind gusts (km/h) predicted for the afternoon of Thursday, May 16 over south-central Chile.

In the afternoon and evening hours of Wednesday you would also see some local showers in the foothills sector, extending from the Valparaíso Region to the Maule Region.

But that does not stop there, since since Thursday morning the convective development clouds -cumulonimbus type- will be present at the rregions of Maule, Ñuble, Biobío and La Araucanía.

It is imperative to take preventive actions against the probable occurrence of waterspouts and tornadoes throughout the day Thursday in the regions just mentioned.

Atmospheric instability will continue to move over central Chile on Friday, so local showers are projected between the regions of Valparaíso and Maule in the afternoon.

News references:

Chilean Meteorological Directorate (DMC). Notices A135-5/2024; A151/2024; A149-1/2024.

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