A more active severe weather pattern is ahead beginning later this week in the Plains and Midwest that could produce large hail, wind damage and possibly a tornado threat.

Tens of millions of people from the Upper Midwest to the Ohio Valley are on alert as a multiday severe weather threat begins Wednesday, with forecasters warning of storms capable of producing tornadoes,

A severe weather setup is taking shape across the northern tier of the country. The Dakotas and Nebraska will be under the threat of severe weather Wednesday, with wind and hail being the primary threats.