Spain, Portugal: High temperatures forecast over most of the countries through at least Aug. 10

Event

Forecast models indicate that high temperatures will persist across much of Spain and Portugal through at least Aug. 10. The Spanish State Meteorological Service (AEMET) has warned of a heatwave affecting most of the country Aug. 7-10, with the western Cantabrian, Galicia, and Mediterranean coasts the least affected. High temperatures of 40-42 C (104-108 F) are likely in southwestern Spain Aug. 7, before shifting over to the northern half of Spain Aug. 8, where temperatures of 36-40 C (97-104 F) are forecast. Temperatures are likely to rise further Aug. 9, reaching 42-44 C (108-111 F), especially in Cantabria Autonomous Community and the eastern half of the country. Minimum temperatures of more than 20 C (68 F) are likely across the country, with higher minimum temperatures of more than 25 C (77 F) possible in the southern half of Spain. High temperatures are likely to persist through Aug. 10.

As of early Aug. 7, the Spanish State Meteorological Service (AEMET) and the Portuguese Institute of the Sea and the Atmosphere (IPMA) have issued the following warnings:

• Red (highest level on a three-tier scale) high-temperature warnings: Castelo Branco, Evora, Lisbon, Portalegre, and Setubal districts in Portugal Aug. 7-8.

• Orange high-temperature warnings: the rest of Portugal Aug. 7, the rest of Portugal and southwestern Spain Aug. 8, central and northeastern Portugal and western Spain Aug. 9, and most of Spain Aug. 10.

• Yellow high-temperature warnings: the rest of the affected area Aug. 7-10.

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)