Update 5:30AM CST…
Snow will be ending from west to east this afternoon with an additional accumulation of an inch or two possible, perhaps a little more closer along the Lake Michigan shoreline. Tonight accumulating lake-effect snow showers will likely continue in northwest Indiana. The Winter Weather Advisory close-in will end early this afternoon from Chicago – north and in northwest Indiana this evening-later tonight. With temperatures falling into the teens area-wide, snow will stick and highways, especially side roads and streets/sidewalks could be slick, so take appropriate precautions if out and traveling.
A cold front will move east and south of the Chicago area by midday with winds shifting north-northwest. There is upper-level support for continuing snow across our area this Sunday morning then that impulse moves east with the cold front this afternoon, leaving northwest winds area-wide supporting additional lake-effect snow showers in northwest Indiana which should slack off later tonight from west to east.
Accumulating snow is forecast to spread from west to east across northeast Illinois into northwest Indiana tonight, gradually ending from the west Sunday. A Winter Weather Advisory (purple-shaded area on the highlighted map) for 2 to 4-inches of snow is in effect later this evening overnight into Sunday for close-in counties around the Lake Michigan shoreline. Farther away from the influence of the lake, snowfall totals will be more on the order of 1 to 3-inches. Snow will end from the west Sunday with the Winter Weather Advisory ending around noon in counties north of Chicago and 3-6 PM in Chicago south and east into northwest Indiana.
A center of low pressure will move east out of the plains tracking across Chicago later tonight, shifting east of our area Sunday. System snow will be enhanced by lake-effect snow showers, as the low pressure moves overhead and just to our east and winds swing around to the north-northeast and then northwest – hence the greater snowfall expected along counties adjacent to Lake Michigan .
If planning on travel, prepare for snow-covered roads and slick driving conditions developing this evening and continuing into Sunday.