Windchill could fall to -15 as temperatures reach lowest mark since February.
Area 17th poorest of 150 big cities.
Average speed calculated at over 90 mph
Crews stay busy as cold moves in starting tonight.
Cargo flourishes with new trade under LaMarre.
Volunteers sought to help elderly, disabled clear walks.
Snow factor in Ohio, Pennsylvania, Michigan pileups on Thursday.
Selfridge north of Detroit makes latest Air Force list.
Green flashers will be like Ohio’s.
Streets could reopen Thursday near site of crash.