Despite rain and chills, Indiana communities are not rescheduling trick-or-treating hours.
A flash flood watch is in effect for most of south central Indiana until 2:00 a.m.
High temperatures should reach into the low 90's this week, after a summer of cool temperatures due to shifting Canadian air.
Severe thunderstorms expected over parts of the middle Mississippi and lower Ohio Valleys this afternoon and tonight.
Several counties are experiencing flash flood warnings, and a tornado reportedly caused damage to several homes near Plainfield.
The severe weather threat will be highest from Interstate 70 southward.
Severe thunderstorms are expected to develop along a cold front today and through this evening.
A freeze watch is in effect for southern Indiana for Tuesday night and Wednesday morning as temperatures fall to 25 degrees.
The study looked at years of tornado climatology data to determine where tornadoes in Indiana touched down most frequently.
The ups and downs felt throughout the Midwest recently will continue as a new cold front threatens to bring back colder temperatures, sleet and snow.