Europe: High temperatures forecast to persist across southern and southeastern regions through at least July 27 /update 4

Event

High temperatures are forecast across much of southern and southeastern Europe through at least July 27. Maximum temperatures of around 30-44 C (86-111 F) are forecast across much of the region, with localized higher temperatures. Slightly cooler temperatures are likely in Italy from July 26 and Greece and the Balkans from July 27; however, a new heatwave is expected to begin to impact the region before the end of the month.

As of early July 24, the various meteorological services for the respective countries have issued the following heat-related warnings across the region:

• Red high-temperature warnings (the highest level on a three-tier scale): Parts of central and northern Bosnia and Herzegovina.
• Orange high-temperature warnings: Across the rest of Bosnia and Herzegovina, with the exception of some western regions; Corsica; Dubrovnik and Split regions in Croatia; across western and southern and eastern island regions of Greece; parts of southern Hungary; Abruzzo, Basilicata, Calabria, Campania, Lazio, Marche, Molise, Puglia, Sardinia, Sicily, Tuscany, and Umbria regions Italy; Kosovo; central and coastal areas of Montenegro; North Macedonia; and Serbia.
• Yellow high-temperature warnings: Parts of western Bosnia and Herzegovina; parts of central, northern, southeastern, and southern Bulgaria; Knin Region in Croatia; across the rest of Greece not under orange warnings; parts of central, eastern, and western Hungary; and across northern Montenegro.

Officials could update and extend the coverage of weather alerts over the coming days.

The high temperatures may result in increased energy and water demand and a heightened risk of heat-related illnesses, such as heat exhaustion and heat stroke.

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.

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 stress vehicles, making tire blowouts more common. Major flight disruptions are unlikely, 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 heat waves, 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 water or water that 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

Meteo Alarm
Bosnia and Herzegovina Federal Hydrometeorological Institute
Bulgaria National Institute of Meteorology and Hydrology (NIMH)
Croatian Meteorological and Hydrological Service (DHMZ)
Hellenic National Meteorological Service
Meteorological Service of Hungary
Italy Meteorological Service
Republic Hydrometeorological Service of Serbia