Heavy snow fell Tuesday morning in parts of Northwest Indiana, leading to multiple spin-out and slide-off crashes.
Snow squalls reduced visibility to a quarter of a mile or less, and gusty winds were likely to affect travel, according to the Indiana Department of Transportation Northwest.
Winter weather watches for Porter, LaPorte and Starke counties were upgraded to winter weather advisories, according to the National Weather Service.
The advisory for Porter County will continue until midnight. LaPorte and Starke counties will be under the advisory from 3 p.m. Tuesday to 6 a.m. Wednesday.
A winter weather advisory for Lake County remained in effect until 9 p.m.
Indiana State Police for the Lowell post responded to multiple crashes Tuesday morning, including a jackknifed semitrailer on westbound Interstate 94 near Burns Harbor.
The semi was the only vehicle involved, and no serious injuries were reported, state police spokeswoman Sgt. Ann Wojas said. Minor injuries were reported in a separate single-car crash about a tenth of a mile ahead of the jackknifed semi, and none of the crashes reported as of 1 p.m. resulted in serious injury, she said.
Traffic moved slowly throughout the morning on parts of I-80/94, I-65 and the Indiana Toll Road.
Heavier bands of lake-effect snow were expected to persist in Porter County and areas to the east through Tuesday night.
INDOT warned drivers to take it slow and stay clear of plow trucks.
LaPorte and Jasper counties were under a travel advisory, which means routine travel may be restricted because of hazardous conditions, according to the Indiana Department of Homeland Security.
Starke County was under a travel watch, which means only essential travel is recommended.
The new snow expected Tuesday comes after 4 to 6 inches were reported throughout southern Lake and Porter counties and much of LaPorte County during a 24-hour period from Sunday morning to Monday morning.
Additional accumulation of 2 to 5 inches was expected Tuesday in localized areas of Lake County.
In Porter and LaPorte counties, snowfall rates of 1 to 2 inches per hour for short durations. Porter County could see new accumulation of up to 6 inches.
LaPorte and Starke counties could see total new accumulation of 3 to 5 inches.
Residents were urged to continue to monitor weather forecasts before heading out.
Several schools have announced delays and closures Tuesday because of the weather.
Check back at nwi.com for updates.