Snow began to fall early Wednesday, threatening to make roads across the Chicago area a wintry mess once again ahead of the morning commute.
The entire Chicago region was under a Winter Weather Advisory beginning between midnight and 3 a.m. for most counties, and continuing through Wednesday afternoon and evening.
The Advisory warns of snow totals of up to three inches and ice accumulations of up to one tenth of an inch for some locations, making for potentially dangerous travel conditions.
For LaSalle and Kankakee counties in Illinois and Newton and Jasper counties in Indiana, the advisory began at midnight and continues until noon Wednesday, with up to two inches of snow and one tenth of an inch of ice possible. In DeKalb County, it continues until 6 p.m. Wednesday with up to 3 inches of snow and one tenth of an inch of ice expected.
In Kendall, Will and Grundy counties in Illinois and Lake and Porter counties in Indiana, the advisory began at 3 a.m. and continues until noon. There, up to an inch of snow and ice accumulations of a few hundredths of an inch are possible, leading to a light glaze.
In McHenry, Lake, Kane, DuPage and Cook counties the advisory began at 3 a.m. and continues until 3 p.m. Wednesday. There, snow accumulations of up to 2 inches are possible along with ice accumulations of up to one tenth of an inch.
Snow is expected to develop from the south and spread north overnight, mixing with freezing rain and drizzle by dawn for counties south of Interstate 80.
The light snow mixed with light freezing rain or freezing drizzle could create icing conditions on untreated surfaces, according to NBC 5 Storm Team meteorologists.
The hazardous weather could cause travel difficulties across the area, making for slippery roads and limited visibilities, the advisory warns. Higher snow total amounts are expected north and west of Chicago.
The precipitation is expected to transition to mainly rain showers in the afternoon, but could mix with light snow showers again before ending in the evening.
Highs Wednesday will sit in the mid- to upper-30s, where they will likely stay for the remainder of the week.