US: Adverse weather forecast across North Central regions through early June 23 /update 1

Severe weather is forecast across parts of the North Central US through at least early June 23. Multiple rounds of heavy rainfall with isolated thunderstorms are expected across the affected region over the coming days. Storms may be accompanied by strong wind gusts, lightning, hail, and possible tornadoes. Heavy downpours may trigger flooding in low-lying areas, and strong winds may cause property damage and power outages.

As of late June 19, the US National Weather Service (NWS) issued flood warnings across northeastern Minnesota and scattered parts of the rest of the affected area. Authorities will likely issue new alerts as weather conditions change over the coming days.

The NWS's Weather Prediction Center has forecast a moderate risk of excessive rainfall (the second highest level on a four-tier scale) across parts of eastern South Dakota into southeastern Minnesota June 20 and from south central Minnesota into western Wisconsin June 21. There is a slight risk of excessive rainfall across other parts of the affected area through early June 23.

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 heavy rain has saturated the soil.

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

The severe weather will probably contribute to transport disruptions throughout the region. Floodwaters and debris flows will likely render some bridges, rail networks, or roadways impassable, impacting overland travel in and around affected areas. Ponding on road surfaces will cause hazardous driving conditions on regional highways. Authorities will probably temporarily close low-lying routes that become inundated by floodwaters.

Severe weather will likely cause flight delays and cancellations at airports across the affected region. Flooding could block regional rail lines; freight and passenger train delays and cancellations are probable in areas with heavy rainfall and potential track inundation.

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