The man was swept away while trying to cross a creek to check on his grandmother.
The National Weather Service says a tornado hit Prince's Lakes early Sunday.
Economists have told grain farmers to expect, at best, to break even with a good yield, and harsh weather could diminish farmers' harvests.
A Winter Weather Advisory and a Winter Storm Warning have been issued for southern Indiana.
Temperatures below zero could continue Thursday and Friday evening.
The Winter Storm Warning and Winter Weather Advisory will remain in effect from 10 p.m. Friday to 8 p.m. Saturday.
Forecasters at the National Weather Service say colder air will arrive Wednesday afternoon pushing wind chill temperatures to -24 degrees.
Bitter cold will be felt by a large portion of the U.S. east of the Rocky Mountains for the next few days.
Cooler temperatures and an increase in moisture created a healthier environment for fir trees.
A winter weather advisory is in effect until 9 a.m. Monday.