The weather service projects parts of Lake and McHenry counties seeing 4-6 inches of snow Saturday with lesser amounts throughout the Chicagoland area. | Graphic via NWS

The National Weather Service has issued a winter weather advisory as another round of snowfall, bringing possibly up to six inches of snow to Lake and McHenry counties, is expected Saturday.

The National Weather Service (NWS) issued the advisory Friday afternoon and said it will go into effect from 9 a.m. Saturday to 3 a.m. Sunday.

The alert said accumulating snow and hazardous travel is expected for the Chicagoland area.

The band of snow will develop eastward into far northern Illinois Saturday morning, the NWS said.

The snow will continue into Saturday evening and then taper off from west to east into early Sunday morning.

The highest snow amounts will fall across far northern Illinois and southern Wisconsin.

“However, uncertainty still exists with where the swath of heavier snow will set up, so changes to the forecast may still occur,” the alert said.

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The steadiest snowfall rates of one-half inch to one inch per hour are expected to occur in the afternoon and evening.

A sharp drop-off in the snow is likely with a southward extent cut-off likely to be located near or south of Interstate 88, the NWS said.

Warmer air may result in a period of freezing rain south of Interstate 80 Saturday evening into the overnight hours.

The NWS said areas near and south of the Kankakee River have the highest chance of a glaze of ice occurring.

Motorists should plan on snow-covered roads and slippery travel, the NWS said. Visibility could be as low as one-half mile at times.