Temperatures across much of Brazil are expected to rise above average in the coming days following a period of intense polar cold [1, 2].
This rapid shift in weather patterns impacts agricultural cycles and public health, as the country swings from freezing conditions to unseasonable warmth. The transition follows a sharp drop in temperature that brought winter-like conditions to several regions [1, 2].
The cold wave was driven by an intense polar air mass that spread across the country [1, 2]. This system caused temperatures to plummet, with the Southern Region recording lows around 0°C [1]. These conditions led to frosts and severe cold during the first few days of the week [1, 2].
Meteorologists now forecast a "veranico" — a period of high-pressure warm air — to elevate temperatures above the historical average [1, 2]. While the afternoons are expected to be warmer, the mornings will remain cold across various regions [2]. This pattern suggests a volatile atmospheric transition rather than a stable return to spring-like weather [1, 2].
The warming trend is expected to affect a large portion of the Brazilian territory [2]. The interaction between the retreating polar mass and the incoming high-pressure system creates a distinct temperature contrast between the early morning and late afternoon hours [1, 2].
“Temperatures in the Southern Region reached around 0°C.”
The rapid oscillation between a polar air mass and a 'veranico' highlights the volatility of Brazil's winter weather. Such extreme swings can stress local infrastructure and agriculture, particularly in the South, where the contrast between 0°C lows and above-average highs creates significant thermal stress.
