Weather instability is returning to Rio Grande do Sul this Monday, May 4, bringing rain after a brief period of calm. This shift follows a short window of stability created by a mass of dry, cold air.
Atmospheric Shifts Drive New Rain
The return of unstable weather is the result of warmer air advancing from the Northeast of Argentina. Simultaneously, the cold air mass that previously dominated the region is moving toward the Atlantic Ocean.
Even as the sun will be visible on Monday, skies will not be as clear as they were on Sunday, May 3. Increased cloud cover is expected, particularly in the Center and the Northern Half of the state.
These regions may experience rain and drizzle in various locations, with the instability likely to intensify during the second half of the day.
Impact on Porto Alegre and Metro Region
Residents of Porto Alegre and its metropolitan area can expect a day of sun and clouds. However, cloudiness is expected to increase throughout the period.
Meteorological data indicates that precipitation cannot be ruled out by the end of the day for the capital and surrounding areas.
Recent Extreme Weather Patterns
The current instability follows a period of significant weather events. Late last week, a cold front brought strong to severe storms and rainfall reaching up to 250 mm.
In the wake of those storms, a cold air mass triggered a sharp drop in temperatures. On Sunday, three municipalities recorded negative minimum temperatures: Pinheiro Machado reached -2.2ºC, São José dos Ausentes hit -0.7ºC and Herval recorded -0.2ºC.
Other early morning temperatures on Sunday included 0.7ºC in Livramento, 2.2ºC in Espumoso, and 2.6ºC in both Vila Nova do Sul and São Gabriel. 2.7ºC was recorded in Cerrito, 2.9ºC in Cambará do Sul, and 3.1ºC in Dom Pedrito.
Further readings showed 3.2ºC in Hulha Negra and Soledade, 3.3ºC in Piratini and André da Rocha, and 3.4ºC in Farroupilha and Gramado Xavier. Temperatures also hit 3.5ºC in São Sepé, Vacaria, and Monte Alegre dos Campos, and 3.6ºC in São Marcos.
Rounding out the cold snap, 3.8ºC was recorded in Barra do Quaraí, Muitos Capões, and Pedro Osório, while 3.9ºC was seen in Tupanciretã, Pedro Osório, and Rio Grande.
Frequently Asked Questions
Why is the weather becoming unstable again on Monday?
The instability is caused by warmer air moving in from the Northeast of Argentina and the cold air mass shifting toward the Atlantic Ocean.
What is the forecast for Porto Alegre?
Porto Alegre and the metropolitan region will have sun and clouds with increasing cloudiness, and precipitation is possible by the end of the day.
Which cities experienced sub-zero temperatures on Sunday?
Pinheiro Machado (-2.2ºC), São José dos Ausentes (-0.7ºC), and Herval (-0.2ºC) all recorded negative minimum temperatures.
How has the recent shift in temperature affected your daily routine?
