Becket Dyer, from Campbell, Calif., uses a blow up unicorn as a sled on Capitol Hill as a winter storm arrives in the region, Sunday, Jan. 13, 2019, in Washington. (AP Photo/Alex Brandon)

People sled on Capitol Hill as a winter storm arrives in the region, Sunday, Jan. 13, 2019, in Washington. (AP Photo/Alex Brandon)

A snow family is seen on Capitol Hill as a winter storm arrives in the region, Sunday, Jan. 13, 2019, in Washington. (AP Photo/Alex Brandon)

An American flag waves in front of the U.S. Capitol Dome as a winter storm arrives in the region Sunday, Jan. 13, 2019, in Washington. (AP Photo/Alex Brandon)

Snow blankets a statue of Andrew Jackson in Lafayette Square with the White House behind, as a winter storm arrives in the region, Sunday, Jan. 13, 2019, in Washington. (AP Photo/Alex Brandon)

Jeremy Binstock gives his niece Olivia Binstock, 4, a sled ride as he hangs onto his dog Bagel, on Capitol Hill as a winter storm arrives in the region, Sunday, Jan. 13, 2019, in Washington. (AP Photo/Alex Brandon)

Two children go over a ramp as they sled on Capitol Hill as a winter storm arrives in the region, Sunday, Jan. 13, 2019, in Washington. (AP Photo/Alex Brandon)

A sledder is dwarfed by snow-covered trees in Loose Park, Sunday, Jan. 13, 2019, in the aftermath of a winter storm that dropped more than 8 inches of snow in the Kansas City, Mo., area. (AP Photo/Charlie Riedel)

A woman walks past a snow-covered tree in Loose Park, Sunday, Jan. 13, 2019, in the aftermath of a winter storm that dropped more than 8 inches of snow in the Kansas City, Mo., area. (AP Photo/Charlie Riedel)

A person walks past snow-covered trees in Loose Park, Sunday, Jan. 13, 2019, in the aftermath of a winter storm that dropped more than 8 inches of snow in the Kansas City, Mo., area. (AP Photo/Charlie Riedel)

People participate in a snowball fight on the National Mall in Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

People participate in a snowball fight on the National Mall in Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

People participate in a snowball fight on the National Mall in Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

People participate in a snowball fight on the National Mall in Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

A man carries a snowboard across the National Mall in Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

A woman walks her dog as snow continues to fall in Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

Two people run on a plowed roadway in Rock Creek Park as snow continues to fall in Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

People walk and run in Rock Creek Park as snow continues to fall in Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

A cross country skis in Rock Creek Park as snow continues to fall in Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

Two people run on a plowed roadway in Rock Creek Park as snow continues to fall in Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

A man brushes snow off his windshield in the Dupont Circle neighborhood of Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

A discarded Christmas tree sits on a car hood covered in snow in the Dupont Circle neighborhood of Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

An unplowed roadway as snow continues to fall in the Dupont Circle neighborhood of Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

A cross country skier passes the US Capitol on the National Mall on the 23rd day of a government shutdown during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

The US Capitol is seen as people walk and ski along the National Mall on the 23rd day of a government shutdown during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People play in the snow on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

A US Park Police Officer blocks a snow ball thrown at him during a snowball fight on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People play in the snow on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

A person throws a snowball at US Park Police during a snowball fight on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

A man passes the Washington Monument while using a kite to snowboard on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People engage in a snowball fight on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

Tourists photograph a snowman by the Washington Monument on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

A homeless man rests above a warm air vent near the White House during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

A National Parks employee walks past the White House after clearing snow on the 23rd day of a government shutdown during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People walk near the Washington Monument while visiting the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

The Washington Monument and a snowman are seen on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People engage in a snowball fight on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People engage in a snowball fight on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People engage in a snowball fight on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People engage in a snowball fight on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People engage in a snowball fight on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People engage in a snowball fight on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People engage in a snowball fight on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People engage in a snowball fight on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People engage in a snowball fight on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People visit the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

A man uses a kite to snowboard near the Washington Monument on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

A man uses a kite to snowboard near the Washington Monument on the National Mall during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

A woman crosses the street during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

A woman crosses the street during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

A man cleans a car during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

A woman walks past bike shares during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

A man walks a dog during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

Foot and paw prints are seen in the snow in downtown Washington, DC January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by EVA HAMBACH / AFP)

Bikes sit idle in an empty park in downtown Washington, DC January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by EVA HAMBACH / AFP)

A dog runs after his ball in a park in downtown Washington, DC January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by EVA HAMBACH / AFP)

A dog runs with his ball in a park in downtown Washington, DC January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by EVA HAMBACH / AFP)

A man strolls near a mural in an empty square in downtown Washington, DC January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by EVA HAMBACH / AFP)

Joggers walk across a wooden bridge in Rock Creek Park as snow continues to fall on Washington, DC, January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Eric BARADAT / AFP)

A person walks in Rock Creek Park as snow continues to fall on Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Eric BARADAT / AFP)

Snow falls on Rock Creek Park in Washington, DC, January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Eric BARADAT / AFP)

Snow falls on Rock Creek Park in Washington, DC, January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Eric BARADAT / AFP)

Three women dressed in American revolutionary outfits walk in Rock Creek Park as snow continues to fall on Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Eric BARADAT / AFP)

Three women dressed in American revolutionary outfits walk in Rock Creek Park as snow continues to fall on Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Eric BARADAT / AFP)

Three women dressed in American revolutionary outfits walk in Rock Creek Park as snow continues to fall on Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Eric BARADAT / AFP)

Three women dressed in American revolutionary outfits walk in Rock Creek Park as snow continues to fall on Washington, DC on January 13, 2019. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Eric BARADAT / AFP)

People visit Capitol Hill during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

Snowmen are seen on Capitol Hill during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People sled on Capitol Hill during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People sled on Capitol Hill during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

People sled on Capitol Hill during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

TOPSHOT - A jogger runs by the Lincoln Memorial as snow is accumulating in Washington DC on January 13, 2019. - Washington area residents are waking up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Eric BARADAT / AFP)

TOPSHOT - Rare tourists visit the Lincoln Memorial as snow is accumulating in Washington DC on January 13, 2019. - Washington area residents are waking up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Eric BARADAT / AFP)

TOPSHOT - A family sleds down the West Front of the US Capitol as snow continues to fall in Washington, DC on January 13, 2019. - Washington area residents are waking up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Alex Edelman / AFP)

TOPSHOT - A view of the White House during a winter storm on the 23rd day of the US government shutdown January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

TOPSHOT - A cross country skier passes the US Capitol on the National Mall on the 23rd day of a government shutdown during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)

TOPSHOT - Snowmen are seen on Capitol Hill during a winter storm January 13, 2019 in Washington, DC. - Washington area residents woke up to a winter wonderland, and may need to shovel aside several inches of snow that fell overnight as a winter storm warning remains in effect until 6 p.m. Sunday and more snow is expected to fall. (Photo by Brendan Smialowski / AFP)