Maryland's State Highway Administration is treating major routes and highways in preparation for Tuesday morning's wintry mix.

Charlie Gischlar, the agency's spokesperson, said crews started the treatment work after Monday morning's rush hour.

Precipitation is expected to start falling between 4 a.m. and 6 a.m., with first a few sprinkles, followed by snowflakes, and sleet pellets. Frederick, Carroll, and Howard County communities will be the first impacted.

The storm spreads eastward through the morning hours. A messy wintry mix is expected during the morning commute across the Baltimore metro.

It is likely that by 8 a.m., multiple precipitation types will be falling across Baltimore County, including snow, sleet, and plain cold rain. The Inner Harbor and downtown areas are expected

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