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MetRA / Disclosure
Electrical storms hit central Argentina today (25) with hail, like that of Rosario (photo), and locally intense rains. The accumulated until Friday afternoon reached 117 mm on July 9, 101 mm on May 25 and between 50 mm and 80 mm in other cities of the province of Buenos Aires. The trend is for the storms to intensify today and Saturday morning, affecting the provinces of Santa Fé, Buenos Aires, Entre Ríos and Córdoba, as well as part of Uruguay. In the Uruguayan territory, the outlook is for a greater risk of strong to severe storms at the end of Saturday and early Sunday.
In Rio Grande do Sul, very hot air invades the State associated with a low-level jet stream that brings strong gusts of wind from the north quadrant this Saturday and raises the temperature from 37ºC to 38ºC in the afternoon in the northwest. Instability will be concentrated in the south of Rio Grande do Sul with heavy rains, lightning, isolated hail and the risk of strong localized winds. In the Center, the West and the East of the State, isolated instability is likely to occur and with the supply of warm air, isolated storms cannot be ruled out. In the East, at any time of the day and in the Center and in the West in the afternoon or at dusk.
MetSul remains alert (read more here) that the worst instability in Rio Grande do Sul will occur on Sunday, when a cold front moves through the state. The system will enter the Uruguaiana region at dawn and then will bring rains to the entire state with the risk of isolated strong to severe storms with potential for hail and localized gales as the system will advance in a very hot atmosphere and with low atmospheric pressure under a strong jet stream at low levels. The storms can reach Santa Catarina and Paraná on Sunday with the highest risk of severe weather in the west of the two states.
This wind current originating in Bolivia, which brings warm air, in addition to causing strong north wind in several regions, will make Sunday dawn an unusually high temperature, with heat around 30ºC in some cities in the middle of the night , if the valleys and slopes of the Sierra.
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