Spain, Portugal: High temperatures forecast to continue over parts of both countries through at least Aug. 13 /update 1

Event

Forecast models indicate that high temperatures will persist across parts of Spain and Portugal through at least Aug. 13. The Spanish State Meteorological Service (AEMET) has warned that the ongoing heatwave affecting much of mainland Spain will persist through at least Aug, 11. High temperatures of 40-42 C (104-108 F) are likely in southern and central regions, with isolated higher temperatures possible. The air mass producing the heatwave will also move over the Canary Islands from Aug. 11. Temperatures of 38-40 C (100-104 F) are possible in the islands Aug. 11-12 before a slight drop from Aug. 13. High temperatures are expected to persist in southern and interior parts of mainland Portugal through at least Aug. 12 and in Madiera through at least early Aug. 13.

As of Aug. 10, the Spanish State Meteorological Service (AEMET) and the Portuguese Institute of the Sea and the Atmosphere (IPMA) have issued the following warnings:

• Red (the highest level on a three-tier scale) high-temperature warnings: Parts of southeastern Castilla-La Mancha, eastern and northeastern Murcia, and southern Valencia autonomous communities in Spain.

• Orange high-temperature warnings: Across much of east-central, northeastern, southern, and southeastern mainland Spain, parts of Gran Canaria in the Canary Islands, Faro District in southern Portugal, and parts of Maderia.

• Yellow high-temperature warnings: Across much of the rest of central, eastern, northeastern, and southern mainland Spain, parts of the Balearic Islands, much of the Canary Islands, Beja Braganca, Castelo Branco, Evora, Guarda, and Portalegre districts in mainland Portugal, and parts of Madiera.

Authorities will likely issue new alerts or update/rescind existing advisories as weather conditions change over the coming days.

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 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

MeteoAlarm
Portuguese Institute of the Sea and the Atmosphere (IPMA)
Spanish State Meteorological Service (AEMET)