now the concern is that streets may flood. >> reporter: at least one tornado touched down, packing near 100 mile an hour winds, battering trees and knocking over a tractor-trailer. northwest in norfolk, nebraska, huge hail came beating down, some as big as tennis balls, peppering houses and shattering windows. the system is now moving east, expected to dump stormy weather in the ohio river valley on wednesday. clayton sandell, abc news, omaha, nebraska. >> as the storm system moves east, flooding could be severe. >> our coverage right now continues with the latest from accu-weather. we have jim dickey there. good morning, jim. >> reporter: good morning, john and linzie. tracking dangerous thunderstorms the early-morning hours. tracking out of the plains into the midwest. along with the gusty winds and hail we have seen throughout the early morning and also flooding a widespread issue. these are training thunderstorms moving over the same areas multiple times inches upon inches of rain. they will hold together as we head through the morning in to the afternoon and evening.