South America: High temperatures forecast to continue over eastern and north-central Argentina, far southern Brazil, and Uruguay through at least March 14 /update 3

Event

High temperatures are likely to persist across parts of eastern and north-central Argentina, far southern Brazil, and much of Uruguay through at least March 14. Maximum temperatures of up to around 36-38 C (97-100 F) are possible across parts of the affected area March 13-14, before rainfall and slightly cooler temperatures begin to affect the region from March 15.

As of early March 13, Argentina's National Meteorological Service (SMN) has issued the following high-temperature warnings across the country:

• Red high-temperature warnings (the highest level on a three-tier scale): The city of Buenos Aires and parts of northern and northeastern Buenos Aires, central, eastern, and southern Corrientes, eastern and southern Entre Rios, and southern Santa Fe provinces.

• Orange high-temperature warnings: Parts of central and western Buenos Aires central and northern Cordoba, southwestern Corrientes, central and northern Entre Rios, northeastern Santa Fe, and Tucuman provinces.

• Yellow high-temperature warnings: Across the rest of the affected area.

Brazil's National Institute of Meteorology (INMET) has issued an orange heatwave alert (the middle level on a three-tier scale) for western parts of Rio Grande do Sul State through late March 13.

The Uruguayan Institute of Meteorology (INUMET) has issued a heatwave warning across much of the country through March 14, with the exception of southeastern coastal areas.

Officials could upgrade or expand the alerts over the coming days as conditions change.

Hazardous Conditions
The extended period of oppressive heat and dry conditions may produce ideal circumstances for wildfire growth throughout the region. Heatwaves also threaten 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' hospitalization.

Transport and Utilities
Very high temperatures may damage road surfaces, 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 bottled or boiled water. 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 the case of prolonged electricity outages.

Resources

Argentina National Meteorological Service (SMN)
Brazil National Institute of Meteorology (INMET)
Uruguayan Institute of Meteorology (INUMET)