According to the National Institute of Meteorology (Inmet), the coastal and interior region of southern Rio Grande do Sul has a forecast of storms and intense winds this Sunday; Storms can have a volume greater than 100 mm/day, and with winds greater than 100 km/h
O is under alert for the possible formation of a subtropical cyclone, with the forecast of causing storms and intense winds this Sunday (15) in part of Rio Grande do Sul (see list of cities that may be affected below). The alert is from the National Institute of Meteorology (Inmet), which signaled the coastal and interior region of southern Rio Grande do Sul, close to with a warning of great danger (red) for intense rain. Storms, according to Inmet, can present a volume greater than 100 mm/day, and with winds exceeding 100 km/h. The warning of great danger began on the night of this Saturday, 14th, and ends at noon this Sunday. The most affected areas could be the south and east of Rio Grande do Sul, says the institute. “Great risk of damage to buildings, electricity cuts, falling trees, electrical discharges, flooding, floods and major disruptions to road transport.” On Monday, the 16th, the system should move to the high seas.
Cyclone trajectory
MetSul, a website that also provides meteorological measurements and information, warns that the cyclone is moving over land, not over sea. Instabilities will be felt throughout the day, as the cyclone advances through the center and east of the State, possibly reaching the capital Porto Alegre and the metropolitan region, in the afternoon. “When the system reaches the Porto Alegre area, it tends to be weaker, but there may still be some gusts in the second half of Sunday, just less strong than in the South, Campanha and Center of the state”, says Estael Sias, MetSul meteorologists .
Cities with the highest risk of strong to intense wind include those located south of Pelotas and Rio Grande and Campanha. Among them are: Santa Vitória do Palmar; Chuí; Arroio Grande; Jaguarão; Herbal; Aceguá; Bagé; High Stones; Pinheiro Machado; Candiota; Black Coal; Piratini; and Caçapava do Sul.
What is a subtropical cyclone?
A subtropical cyclone is a center of low atmospheric pressure that forms in isolation, without being associated with a cold front – different from an extratropical cyclone, which develops from temperature differences between masses of cold and warm air. Furthermore, the winds associated with this type of cyclone tend to have a speed between 63 km/h and 118 km/h. “In the Southern Hemisphere, the air around the low pressure center moves clockwise. Near the surface, the centers of subtropical cyclones are warmer than the surrounding atmosphere. This makes the atmosphere more unstable and increases the conditions for the occurrence of severe storms”, explains Climatempo, in a note. “Even if the formation and naming of a subtropical cyclone does not actually occur, the sharp drop in air pressure on the coast of Rio Grande do Sul stimulates the formation of heavy clouds, with the potential for heavy rain, in addition to strong winds. The sea should be rough over the weekend on the coast of the southern region”, added the website.
*With information from Estadão Conteúdo
Posted by Victor Oliveira
