Several westbound South Shore commuter trains were delayed early Friday as the Region braced for more snow and cold.
Trains 112 and 110 were running 10 to 15 minutes behind schedule because of the weather, according to several South Shore service alerts.
Snow was expected to begin spreading across Lake and Porter counties on Friday afternoon, dropping 2 to 4 inches north of Interstate 80 and 3 to 5 inches south of the highway. LaPorte County could see 1 to 4 inches, according to the National Weather Service.
A winter weather advisory was scheduled for noon to midnight in Lake, Porter, Newton and Jasper counties and from 1 p.m. Friday to 4 a.m. Saturday in LaPorte County.
The storm could make the afternoon commute difficult, forecasters warned.
The snowstorm could be a prelude to another period of frigid temperatures, and many Region communities have opened warning centers.
By Saturday morning, air temperatures were expected to fall into the low single digits with wind chills as low as 20 below zero.
The cold temperatures were expected to persist through much of next week. Wind chills could fall to minus 25 Sunday night through Tuesday morning.
Lake-effect snow was possible Sunday morning in Lake and Porter counties, with accumulation most likely in Porter County. LaPorte County also could see periodic lake-effect snow, with accumulations expected by the end of next week, the weather service said.