It began this Wednesday (12), in the South, Southeast, Midwest and Northeast of Brazil, a wave of heat that should last until February 21. According to Climatempo, in Rio de Janeiro, and in parts of Minas Gerais, Bahia, Pernambuco and Piauí, temperatures can beat almost 40 ° C.
The company, based on weather models, said the heat wave will also affect Paraná, São Paulo and Espírito Santo.
Based on projections from the University of São Paulo (USP) applied climatology table, in some capitals, high temperatures could generate 70 ° C thermal sensation in the affected regions. However, the models show no conditions that this happens because of the humidity of the air.
Thermal sensation
To inform the thermal sensation, it is necessary to consider the temperature in degrees Celsius (to the left of the table) and the relative humidity (at the top of the table in percentage). Based on the junction of this information we get the thermal sensation.
In a city where thermometers hit 38 ° C and the air humidity is 60%, for example, the thermal sensation felt can be 55 ° C. Another city, expected 41 ° C and moisture of 40%, the sensation can be 53 ° C.
That is, the thermal sensation is not only linked to the temperature in degrees Celsius, but the junction with the humidity of the air at the same time. The higher the air moisture and the temperature, the warmer the thermal sensation.
See below the table:
Record chance
According to Climatempo, the four Southeast capitals have a chance to record heat records for the year 2025, and even summer (started in 2024).
In São Paulo and Rio de Janeiro, the possibilities of record are on Wednesday (12) and Thursday (13). While the state capital can reach 35 ° C, in Rio the forecast is that the capital reaches 39 ° C until the end of the week.
For Belo Horizonte (MG) and Vitória (ES), the expectation is record between Thursday (13) and Friday (14). In BH, thermometers can reach 35 ° C, while in the capital of Espírito Santo the possibility is 39 ° C.
Heat wave
For the world weather organization, heat wave is configured when temperatures remain 5 ° C above average for five consecutive days.
During the heat wave it is important to maintain some precautions such as staying hydrated and avoiding long periods of sun exposure from 10am to 4pm.
It is also recommended to wear lighter clothes and apply sunscreen regularly. In cases of exhaustion and insolation, with nausea and dizziness, it is necessary to seek medical attention.
