Central Europe: Thunderstorms and high temperatures forecast across parts of central Europe through at least June 22

Event

Thunderstorms and high temperatures are forecast across parts of Austria, Czech Republic, Poland, and Slovenia through at least June 22.

As of June 20, the respective meteorological agencies have issued the following weather warnings:

• Orange heat warnings: Parts of northern, western, and southern Austria and across southeastern Poland.

• Orange thunderstorm warnings: Parts of eastern Austria; across most of the Czech Republic with the exception of the far northwest; across most of the southern half of Poland; and across northeastern Slovenia.

• Yellow heat warnings: Across the rest of Austria not covered by orange warnings; southeastern parts of the Czech Republic; and across all of Slovenia with the exception of northwestern regions.

• Yellow thunderstorm warnings: Across the rest of Austria not covered by orange warnings; northwestern parts of the Czech Republic; parts of central Poland; and northwestern regions of Slovenia.

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

Hazardous Conditions
In areas where thunderstorms are forecast, sustained downpours could trigger flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also possible in developed areas with easily overwhelmed stormwater drainage systems. Sites located downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are possible in hilly or mountainous areas, especially where the soil has become saturated by heavy rainfall.

Authorities could issue mandatory evacuation orders for flood-prone communities over the coming days. Disruptions to electricity and telecommunications services are possible where significant flooding or landslides impact utility networks.

In some areas, the extended period of oppressive heat and dry conditions may produce ideal circumstances for 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.

Transport
Floodwaters and debris flows may render some bridges, rail networks, or roadways impassable, impacting overland travel in and around affected areas. Ponding on road surfaces could cause hazardous driving conditions on regional highways. Authorities could temporarily close some low-lying routes that become inundated by floodwaters.

Very high temperatures may warp rail tracks and force passenger and freight trains to operate at reduced speed. 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, 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.

Confirm all transport reservations and business arrangements before traveling in areas where thunderstorms are forecast. Seek updated information on road conditions before driving or routing shipments through areas where severe weather is forecast; plan for possible supply chain disruptions throughout the affected areas. Stay away from elevated streams, creeks, and other watercourses that are prone to flash flooding. Do not attempt to navigate flooded roadways. Exercise caution in elevated terrain due to the threat of landslides.

Resources

MeteoAlarm
Austria Central Institute for Meteorology and Geodynamics (ZAMG)
Czech Hydrometeorological Institute (CHMI)
Poland Institute of Meteorology and Water Management (IMGW)
Slovenia Environment Agency (ARSO)