WJZ meteorologist Chelsea Ingram has the Monday afternoon weather update.

A winter weather advisory is in effect across the region with a few inches of snow expected by the morning commute.

The National Weather Service cautions of 2-4 inches of snow, possibly ending as a period of sleet, freezing rain and rain. Precipitation is forecast to begin around midnight and last until about 8 a.m.

Forecasters warned of slippery roads possible during the morning rush hour.

Weather service forecasters predicted an inch or two of snow across Baltimore, southern Baltimore County and most of Howard County, with higher totals to the north in Carroll, northern Baltimore and Harford counties.

Unlike the winter storm that socked the region with two bursts of wet snow last Wednesday and Thursday, this storm was expected to be a fast-moving one, forecasters said. While the previous storm was what is known as a nor’easter, slowly moving up the coast bringing Gulf of Mexico moisture, Tuesday’s storm is known as a clipper, passing quickly through from the west and carrying less precipitation.

The heaviest snows were possible in Harford County, forecasters said.

If the system outperforms forecasters’ predictions, it could bring as much as 6 inches of snow, but there was about a one in three chance it would bring 4 inches or more, according to the weather service.

Any snow that falls was expected to stick, given cold temperatures ahead of the storm. Temperatures fell to 20 degrees early Monday morning at Baltimore-Washington International Thurgood Marshall Airport, with a 5 mph breeze making it feel like the teens. Temperatures had not surpassed freezing at BWI as of 2 p.m., with the airport registering at 31 degrees.

Warming temperatures were expected the rest of the week, with highs in the mid-40s Tuesday and upper-40s Wednesday, with lows around freezing. By Thursday and Friday, highs could reach the mid-50s with lows in the 30s and 40s.