WASHINGTON, DC — Estimates have increased for the first snowfall of 2020 in the Washington, D.C., region, which should arrive on Tuesday afternoon in time to make the evening commute a slick one. The National Weather Service has issued a winter weather advisory, calling for 1 to 2 inches of snow in parts of northern Virginia. Officials expect snow will be the heaviest Tuesday afternoon into early evening.

Snow may fall at a rate of greater than 1 inch per hour, with visibility limited to one-half mile at times. Forecasters anticipate the heaviest snow between 3 and 6 p.m.

Roads may be snow-covered and slippery, especially northwest of Interstate 95 into the evening commute, according to the advisory.

The winter weather advisory is effective from noon to 7 p.m. for the District of Columbia, Arlington, Falls Church and Alexandria.

Officials urge drivers to slow down and be extra careful. People should give themselves extra time to get where they are going.

Pedestrians should watch their first few steps outside on sidewalks, driveways and steps, which may be slippery and icy.

According to the National Weather Service, a mix of rain and snow moves in after 10 a.m., becoming all snow after 4 p.m. Forecasters put the chance of precipitation at 100 percent.

Virginia Department of Transportation crews have pre-treated trouble spots in higher elevations. Drivers will see trucks staging throughout the region Tuesday to prepare to plow and treat roads as needed. Follow @vadotnova on Twitter for the latest.

Several northern Virginia school systems have announced closures or early dismissals. Drivers are warned that rush-hour volumes are expected to begin earlier than usual Tuesday, while snow bands are making their way across the area.

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Skies will clear Wednesday and the rest of the work week should be dry, but rain will return Saturday.

Tuesday: Rain and snow after 10am, becoming all snow after 4pm. High near 41. Light and variable wind becoming east around 6 mph in the morning. Chance of precipitation is 100%. Total daytime snow accumulation of 1 to 2 inches possible.

Tuesday Night: A slight chance of snow before 10pm. Cloudy during the early evening, then gradual clearing, with a low around 30. Northwest wind 7 to 9 mph becoming southwest after midnight. Chance of precipitation is 20%.

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