Roving bands of clouds could add another 10 inches of snow on much of Northwest Indiana Tuesday.
The National Weather Service in Chicago warned of heavy lake effect snow beginning before daybreak and shifting across the most of Lake, Porter and LaPorte County until 1 a.m. Wednesday.
Monday's snow system dropped between 1 and 2.5 inches across the area before clearing out. However, the powerful storm has set up conditions for intense bands of heavy lake effect snow – some only 10 to 15 miles wide – to form and drift east from the Illinois-Indiana state line.
The snow bands could produce more than two inches of snow per hour. Accumulations may vary drastically over relatively short distances. Earlier Monday night, the weather service increased its prediction of snow accumulation to the possibility of 6 inches to 10 inches, "isolated higher totals possible."
Drivers can expect to encounter slick, snowy roads and scatted slide offs and spin outs during the Tuesday morning commute.
Accumulations of 1 to 1.5 inches of snow fell Monday morning in Crown Point, Dyer, Schererville, Merrillville and Valparaiso, and up to 2.5 inches in Gary and Portage.
The Community Collaborative Rain, Hail and Snow Network reported one inch of new snow was reported early Monday in the City of LaPorte and 1.5 inches in Trail Creek and Kingsbury.
The Lake County Sheriff's Department responded to more than 20 traffic-related calls between 11 p.m. Sunday and early Monday, department spokesman Mark Back said. The volume of calls subsided after that time, he said.
Indiana State Police responded to several crashes on Interstate 94 in Lake and Porter counties early Monday, according to the Indiana Department of Transportation's TrafficWise website.
Drivers who must travel should give themselves extra time, stay behind snowplows and allow plenty of space between vehicles. Black ice may be on bridge decks and entrance and exit ramps, INDOT said.
Check back at nwi.com for updates.