Portugal: Heatwave forecast to continue across mainland areas through at least July 15 /update 1

Event

Forecast models indicate that a heatwave will persist across Portugal through at least July 15. Temperatures of 35-40 C (95-104 F) are expected across much of the affected area, with the exception of some parts of the western coast. In parts of the southern interior and the Tagus and Douro valleys temperatures could reach as high as 38-44 C (100-111 C). Minimum nighttime temperatures are largely expected to stay above 20 C (68 F)

As of July 11, the Portuguese Institute of the Sea and Atmosphere (IPMA) has issued orange (the middle level on a three-tier scale) high-temperature warnings over Beja, Braganca, Castelo Branco, Evora, Guardo, Portalegre, Vila Real, and Viseu districts. Yellow high-temperature warnings are in place over the rest of mainland Portugal. Authorities will likely issue new alerts or update/rescind existing advisories as weather conditions change over the coming days.

Amid the hot and dry conditions, dozens of wildfires have been ignited across the country in recent days. More than 3,000 firefighters were actively involved in tackling the fires as of July 10. At least 29 people have received minor injuries due to the fires. The most significant wildfires are burning in Leira, Santarem, and Vila Real districts. Authorities have declared a contingency situation across the country due to the wildfire threat through July 15.

Hazardous Conditions
The extended period of oppressive heat and dry conditions may produce ideal circumstances for additional wildfire growth throughout the region. 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 engines, 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

MeteoAlarm
Portuguese Institute of the Sea and Atmosphere (IPMA)