Spain, Portugal: High temperatures forecast over much of Spain and Portugal through at least June 29

Event

Forecast models indicate that high temperatures will persist across much of Spain and Portugal through at least June 29. A mass of warm air coming from North Africa will settle over the Iberian Peninsula over the coming days, with high temperatures expected to persist the longest in southern parts of mainland Spain and Portugal.

The Spanish State Meteorological Service (AEMET) issued a bulletin June 22 warning of a period of high temperatures during the final days of June. The highest temperatures are likely in parts of central and southwestern mainland Spain, with highs of over 38 C (100 F) expected in these regions and more than 42 C (108 F) possible in some southern regions. Highs of around 34-38 C (93-100 F) are possible across the rest of mainland Spain and the Balearic Islands. AEMET has issued orange (the middle level on a three-tier scale) high temperature warnings for parts of central, southern, and western Spain and yellow high temperature warnings across much of central, northeastern, southern, and western Spain June 23-25.

The Portuguese Institute of the Sea and the Atmosphere (IPMA) has also issued a bulletin regarding hot weather over the coming days. A gradual increase in temperatures is expected through June 24; highs of over 30 C (86 F) are expected across much of the country, with maximums of 35-42 C (95-108 F) possible in interior regions of central and southern mainland Portugal. Temperatures are expected to decline in northern and central coastal regions and northern interior regions from June 25; however, high temperatures will persist in central and southern regions through at least June 29. As of June 23, the IPMA has issued yellow hot weather warnings across much of mainland Portugal June 23-25.

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)