Antiabortion activists fill the Mall between Seventh Street and the Washington Monument during the 2014 March for Life. (Nikki Kahn/The Washington Post)

Thousands of antiabortion activists will rally near the Washington Monument and march up Capitol Hill on Friday afternoon, despite the snow storm forecast.

The rally is scheduled to begin at noon near the corner of 15th Street and Constitution Avenue, just north of the Washington Monument. The nearby Metrorail stations are Federal Triangle and Smithsonian.

At about 1 p.m., the group will begin a march east along Constitution Avenue and up to First Street NE, in front of the U.S. Supreme Court. The nearest Metrorail stations for the disbanding crowd will be Capitol South and Union Station.

Based on the latest forecast from the Capital Weather Gang, the participants will be cutting it close if they hope to avoid getting delayed by the storm after the march. The storm is likely to arrive sometime between noon and 5 p.m. Conditions will worsen after dark and continue to be bad through Saturday night.

Meanwhile, storm preparations will be in full swing. Participants should be careful not to park on any street marked with the red and white signs that designate the District’s snow emergency routes. An official snow emergency goes into effect at 9:30 a.m., and after that any vehicle parked on an emergency street is subject to a fine and towing.

Also, we’re likely to have an early rush hour in the District on Friday afternoon, as people who came in for work in the morning head home to beat the snowfall. Early-departing commuters should note these street closings for the rally and march, which will affect several important travel routes:

F Street NW will be closed between Sixth Street Seventh streets NW starting at 7 a.m. until about 1 p.m.

Rolling street closings will occur between 11:30 a.m. and 12:30 p.m. on Seventh Street NW from F Street to Jefferson Drive NW.

Rolling street closings will occur on Constitution Avenue NW from 17th Street to First Street from about 1 to 4 p.m.

Rolling street closings will occur on Independence Avenue from 15th Street SW to First Street SE from about 1 to 4 p.m.