Croatia, Slovenia: Adverse weather forecast across the region through at least July 2

Severe weather is forecast across Croatia and Slovenia through at least July 2. Thunderstorms are forecast to break out across the region; heavy rainfall, strong wind gusts, lightning, and possible hail may accompany the storms. Heavy downpours could trigger flooding in low-lying communities, and strong winds could cause property damage and power outages.

As of July 1, the respective meteorological services have issued the following weather warnings across the affected area:

• Red thunderstorm warnings (the highest level on a three-tier scale): Osijek and Zagreb regions in Croatia.

• Orange thunderstorm warnings: Rijeka Region in Croatia and across Slovenia.

• Yellow thunderstorm warnings: Gospic and Karlovac regions in Croatia.

• Yellow rough sea warnings: Southwestern coastal regions in Slovenia.

Further orange and yellow thunderstorm warnings are in place across much of Croatia July 2; however, only yellow rough sea warnings in southwestern coastal regions are in place for Slovenia. Officials could update and possibly extend the coverage of the weather alerts over the coming hours and days.

The storms could produce rounds of heavy rainfall, strong winds, and isolated thunderstorm activity across the affected areas. Sustained heavy rainfall 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, landslides, or strong winds impact utility networks.

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. Strong winds might also pose a hazard to high-profile vehicles.

Severe weather could also trigger flight delays and cancellations at airports across the affected areas. Authorities may temporarily suspend port operations or close beach fronts along the Adriatic coast if strong winds trigger hazardous sea conditions. Flooding could block regional rail lines; freight and passenger train delays and cancellations are possible in areas that see heavy rainfall and potential track inundation.

Localized business disruptions may occur in low-lying areas; some businesses might not operate at full capacity because of flood damage to facilities, possible evacuations, and some employees' inability to reach work sites.