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By Erin McClam

Severe thunderstorms rumbled across the Midwest and the Ohio Valley on Monday, as forecasters warned that 46 million people were in the path of potential rough weather.

Meteorologists said the greatest danger was from strong winds, including the threat of an isolated tornado in Illinois. Severe thunderstorm watches were also posted for parts of Indiana, Ohio, West Virginia and Kentucky, The Weather Channel reported.

Floods also proved to be a major concern in the Blue Grass state, as one person was reported dead and several others missing in Johnson County, Ky., according to NBC affiliate WLEX

The unsettled forecast had raised the possibility of a rainout at baseball’s Home Run Derby Monday night in Cincinnati, but the event took place after a quick downpour.

A chance of rain is also in the forecast there on Tuesday night, when the All-Star Game is to be played.

On Sunday night and early Monday, storms uprooted trees and knocked out power to tens of thousands of people in Illinois, Minnesota and Wisconsin. A wind gust of 74 mph, the strength of a minor hurricane, was recorded in Belleville, Wisconsin.

Storms are expected to threaten much of the Southeast on Tuesday.