Poland: Adverse weather forecast across southeastern regions through at least early July 18

Severe thunderstorms are forecast to break out across parts of southeastern Poland early July 18. Heavy downpours, strong wind gusts, lightning, and hail may accompany storms. Rainfall totals of up to 8 cm (3.1 inches) and winds gusting up to 85 kph (53 mph) are possible in parts of the affected area during storms. Heavy downpours may lead to flooding in low-lying areas, and strong winds may cause property damage and power outages.

The Institute of Meteorology and Water Management (IMGW) has issued the following weather warnings July 17:

• Red thunderstorm warnings (the highest level on a three-tier scale): Parts of southern Lesser Poland and southwestern Subcarpathian provinces.

• Orange thunderstorm warnings: Parts of southern Subcarpathian Province.

• Yellow thunderstorm warnings: Across the rest of the affected area.

Officials will likely update and/or extend the coverage of weather alerts over the coming hours and days.

The storms could produce heavy precipitation and strong winds across affected areas. Sustained heavy rainfall could trigger flash and areal flooding in affected areas. Such flooding is possible in low-lying communities near watercourses and other large bodies of water and in urban areas with easily overwhelmed stormwater drainage systems. Sites downstream of large reservoirs may be subject to flash flooding after relatively short periods of intense rainfall.

Floodwaters and related debris may render some bridges, rail networks, or roadways impassable, impacting overland travel in and around the affected area. Flooding in urban areas could also result in significant traffic congestion. Disruptive weather may cause delays and cancellations at regional airports. Flooding could block regional rail lines; freight and passenger train delays and cancellations are possible in areas that see heavy rainfall and potential track blockages.

Disruptions triggered by inclement weather and resultant hazards, such as flooding or strong winds, could persist well after conditions have improved - it could take days before floodwaters recede and/or officials clear debris. Repair or reconstruction efforts may result in residual disruptions if there is severe damage to infrastructure.