Porter and LaPorte counties are bracing for as much as 7 inches of snow overnight.
The National Weather Service issued a lake-effect snow watch for Porter and LaPorte counties through 7 p.m. Tuesday. Those areas are expected to get the greatest accumulations. Other areas from Chicago through Northwest Indiana are expected to see about 1 inch of accumulation on grassy areas.
Light rain change to snow late Monday into early Tuesday as temperatures drop from the low 40s to below freezing.
A strong cold front is expected to push across the region with cold air pushing southward across the warm waters of Lake Michigan, creating the potential for heavy lake-effect snow. Forecasters said localized bursts of heavy snow with whiteout conditions and 2- to 3-inch per hour snowfall rates are possible.
The heaviest snowfall is expected to develop overnight into early Tuesday before tapering off and moving eastward Tuesday morning.
The National Weather Service is warning of whiteout conditions, snow squalls with wind gusts of more than 30 mph and blowing and drifting snow on roadways, creating potentially dangerous driving conditions.