Balkans endure extreme heat wave with temperatures reaching 43 °C FAST-MOVING

Balkans heat wave red meteorological alarm traffic congestion free museum entry Zagreb car interior temperature

A severe heat wave is sweeping the Balkans. Red meteorological alarms have been issued for large parts of Croatia, Bosnia and Herzegovina and Serbia, with forecast maximum temperatures of up to 43 °C in Bosnia, 42 °C in Croatia and 38 °C in Serbia. Health agencies warn that prolonged exposure can cause dehydration, heat‑stroke and aggravate chronic conditions. The Institute for Food Safety and Health (INZ) advises limiting outdoor activity between 10 am and 5 pm, staying well‑hydrated and seeking shade.

Transport authorities report heavy traffic on major highways in Bosnia and Herzegovina, especially the Jablanica‑Konjic corridor, and long queues at border crossings such as Izačić and Velika Kladuša. The Bosnian Auto‑Moto Club (BIHAMK) recommends frequent breaks, avoiding long trips during the hottest part of the day and restricting vehicle loads on certain routes.

In Croatia, Zagreb has opened its public pools, museums and libraries for free entry over the weekend to give residents relief from the heat. Mayor Tomislav Tomašević highlighted the initiative as a way to provide cooling spaces while the heat wave continues.

Vehicle interiors can exceed 60 °C within an hour of being parked in direct sunlight, posing fire risks to plastics, electronics and batteries. Drivers are urged to keep cars ventilated and not leave children, pets or valuables in parked cars.

Entities: BIHAMK · Balkans · Baraćeve špilje · Bosnian Auto‑Moto Club (BIHAMK) · City of Zagreb · Croatia · Croatian State Hydrometeorological Service (DHMZ) · Federal Hydrometeorological Service of Bosnia and Herzegovina (FHMZ) · Institute for Food Safety and Health (INZ) · Nova Kršlja · Plitvička jezera · Pločama

Claims

What the coverage asserts, and how well corroborated each claim is across sources.

[○ 1 SOURCE] Lithium‑ion battery‑powered devices can overheat, deform or fail when left in a car exposed to extreme heat. (14a950a5-a77b-42c8-999e-a37c6588b756)
[○ 1 SOURCE] At 25 °C outside, a parked car’s cabin reaches about 38 °C within 20 minutes. (84e00fea-6638-4333-997c-5ce7b1c71da9)
[○ 1 SOURCE] At 36 °C outside, cabin temperature rises to 45 °C in 10 minutes, 55 °C in 30 minutes and over 60 °C after an hour. (84e00fea-6638-4333-997c-5ce7b1c71da9)
[○ 1 SOURCE] High temperatures caused kilometer‑long traffic queues on the Jablanica–Konjic road in Bosnia and Herzegovina. (cc774fb6-f672-47c3-b536-345827de104b)
[○ 1 SOURCE] Plastic water bottles left in a hot car can burst or act as a lens, increasing fire risk. (14a950a5-a77b-42c8-999e-a37c6588b756)
[○ 1 SOURCE] Interior surfaces such as seats and steering wheel retain heat longer than the air, delaying cooling. (84e00fea-6638-4333-997c-5ce7b1c71da9)
[● 2 SOURCES] BIHAMK advised drivers to take frequent breaks and avoid long trips during the hottest part of the day. (cc774fb6-f672-47c3-b536-345827de104b,58f0e388-10f9-46a6-b4a3-d6adf02e24ad)
[○ 1 SOURCE] Several highway sections in Bosnia were closed for construction, prompting detours. (cc774fb6-f672-47c3-b536-345827de104b)
[○ 1 SOURCE] A car parked in sun can reach interior temperatures above 60 °C within 60 minutes when outside temperature is 36 °C. (high)
[○ 1 SOURCE] Lithium‑ion batteries in electronic devices may overheat, deform or fail when left in a hot car. (high)
[○ 1 SOURCE] Experts advise opening doors and windows before entering a hot car and using climate control after a short ventilation period. (high)
[○ 1 SOURCE] Plastic bottles left in direct sunlight can act as lenses and potentially ignite upholstery. (high)