The storm front that swept through Slovenia late Monday afternoon continued its path southeastward and reached Croatia. Hail fell near Ogulin, drivers stopped on the A1 motorway, and Zagreb was hit by a thunderstorm with heavy rain.
The severe weather that affected the far northwest of Slovenia late in the afternoon on Monday, August 17, 2026, continued to spread southeastward and reached Croatia during the evening. According to data from the Slovenian Environment Agency (ARSO), radar images indicated strong thunderstorm cells developing along the front.
At the Krn meteorological station, 25 millimeters of rain fell in just half an hour, while at Kanin, 20 millimeters fell in the same period. In addition to heavy rain and thunderstorms, meteorologists also warned of strong northerly wind gusts. At Ljubljana Jože Pučnik Airport, wind gusts of up to 76 kilometers per hour were recorded, and tramontana winds were possible along the Slovenian coast.
The Slovenian Administration for Civil Protection and Disaster Relief received several reports of fallen trees and flash flooding in the vicinity of Radovljica and Kranj, but these incidents had not yet been verified. The arrival of the front caused a sudden drop in temperature, so in western Slovenia, after the storm passed, the mercury fell below 20 degrees Celsius, while in the eastern part of the country it was around 25 degrees at the same time.
The front continued its path toward Croatia, with stronger storms affecting parts of central Croatia and the Lika region. It was particularly intense in Ogulin, where, along with heavy rain, hail began to fall. On the A1 motorway, precipitation was so intense that traffic was significantly disrupted, and some drivers pulled over onto the hard shoulder. Thunder could be heard amid the heavy rain.
The downpour also hit Zagreb, where the heaviest rain lasted briefly, then continued with lighter intensity. The temperature dropped significantly, by at least about five degrees. After 8 p.m., rain also began to fall in the capital.
Due to expected heavy showers accompanied by thunderstorms in the northern Adriatic and central Croatia, as well as possibly strong gusty winds, the State Hydrometeorological Institute (DHMZ) issued yellow weather alerts for most of the country. An orange warning was issued for the Rijeka area, indicating more dangerous weather phenomena with the potential for damage.
During the night, conditions are expected to stabilize with partial clearing, and fog may form in some low-lying areas by morning. Drivers are advised to exercise increased caution due to reduced visibility, water on the roads, and possible sudden wind gusts during stronger thunderstorms.
