Severe Weather Alerts for Ohio and Pennsylvania A significant weather event is impacting a vast area of the United States on Wednesday, with thunderstorm watches already activated in parts of Ohio and Pennsylvania.

A tornado warning in Bowling Green and parts of Wood County, Ohio, sent residents rushing to shelter as sirens blared and severe weather intensified.

Milwaukee and much of southern Wisconsin is under a tornado watch as severe weather is expected to move across the state the afternoon and evening of April 14. A confirmed tornado was located just before 6:30 p.

A tornado watch has been issued for several counties across Oklahoma, including the OKC metro, as severe storms could produce twisters and large hail on Tuesday.

Forecasters are warning that very large hail, damaging winds and a few tornadoes are likely by late afternoon.

Two rounds of storms, some severe, are expected to hit the Chicago area on Tuesday.

The National Weather Service warned the system could bring "stronger, long track tornadoes" at an EF2 level or higher, along with wind gusts and softball-sized hail.

Millions of people were placed under the tornado watch on Tuesday afternoon ahead of damaging storms set to hit.

Tornado safety guide for severe weather season: what to do during a warning, driving safety tips, emergency kits, and common tornado myths to avoid.