Brazil: High temperatures forecast to persist across central regions through at least Aug. 28

Event

Forecast models indicate that high temperatures will persist across much of central Brazil through at least Aug. 28. An unseasonable heatwave has been affecting much of the region in recent days, with the highest temperature of the year of 41.8 C (107.2 F) recorded in Cuiaba Aug. 23. An advancing cold front is expected to slowly push the expanse of heat eastward in the coming days, before temperatures return to more seasonable norms across much of the country by Aug. 29.

As of early Aug. 25, the National Institute of Meteorology has issued orange heatwave and low humidity warnings across parts of western Bahia, far southwestern Ceara, eastern Maranhao, far northwestern Minas Gerais, western Pernambuco, much of Piaui, and far eastern Tocantins states. Yellow heatwave and low humidity warnings are in place across much of the rest of the affected area.

The high temperatures may result in increased energy and water demand and a heightened risk of heat-related illnesses, such as heat exhaustion and heat stroke.

Hazardous Conditions
The extended period of oppressive heat and dry conditions may produce ideal circumstances for wildfire growth throughout the affected areas. Heatwaves also pose a threat to vulnerable groups - such as the elderly, children, pregnant women, and those with respiratory illnesses - due to the increased possibility of heat stroke or heat exhaustion during prolonged exposure to high temperatures. These health risks could also extend to relatively healthy individuals during significant heatwave events. In addition to significantly impacting athletes and those who work outdoors, high temperatures can cause problems for people using mass transit. The lack of air conditioning and cramped vehicles during rush hour may lead to some passengers being hospitalized for dehydration.

Transport and Utilities
Very high temperatures may warp rail tracks and force passenger and freight trains to operate at reduced speeds. Road surface damage is also possible, and overheated vehicles may worsen traffic problems in urban areas where congestion is already a problem. Commercial trucking disruptions might occur, as very high temperatures put more stress on vehicles, making tire blowouts more common. Major flight disruptions are unlikely at regional airports, but general aviation disruptions are possible, and some airfreight carriers could reduce cargo loads. High temperatures could lead to an increased demand for electricity, which might trigger localized brownouts or blackouts, exacerbating hazardous conditions when air conditioning is no longer possible.

Advice

Monitor local media for weather updates and related advisories. During heatwaves, remain indoors in air conditioning when possible. If outdoor activities are necessary, frequently rest in shaded areas; avoid activity during the hottest times of the day. Stay well-hydrated by drinking plenty of fluids. Avoid alcoholic beverages, which are dehydrating; drink water that is bottled or has been boiled. Wear loose-fitting, light-colored clothing. Cotton fabrics are more cooling than synthetics. Promptly seek medical attention if signs of heat exhaustion or heat stroke develop. Charge battery-powered devices in case prolonged electricity outages occur.

Resources

Bolivia National Meteorology and Hydrology Service (SENAMHI)
Peru National Meteorology and Hydrology Service (SENAMHI)