PHOTOS: Dangerous flash floods soak Washington, D.C.

Heavy rainfall flooded the intersection of 15th Street and Constitution Ave., NW stalling cars in the street, Monday, July 8, 2019, in Washington near the Washington Monument. (Photo: Alex Brandon/AP)

A dangerous flash flood emergency hit Washington D.C. during the Monday morning commute.

With up to three inches of heavy rain falling in the region, the National Weather Service said the area was already seeing significant flash flooding.

"Travel will be extraordinarily dangerous," the National Weather Service warned on Twitter. "Stay out of low areas, if in a low area that may flood, seek higher ground. Stay off the roads if at all possible. This is not the 'usual' flooding."

The weather has halted Amtrak trains traveling south of D.C. The flooding comes as a new storm system develops in the Rockies, which will move east Monday.

The biggest threat with these storms Monday will be damaging winds, large hail and an isolated tornado. (GMA-ABC News)

See more news-related photo galleries and follow us on Yahoo News Photo Twitter and Tumblr.

Flooding is seen in the basement of the White House briefing room in Washington, D.C, on July 8, 2019, as widespread dangerous flash flooding was occurring throughout the DC metro area, including in downtown Washington DC. (Photo: Nicholas Kamm/AFP/Getty Images)
A park bench sits under water in East Potomac Park in Washington, DC on July 8, 2019, after a storm caused flooding. (Photo: Jim Watson/AFP/Getty Images)
Heavy rainfall flooded the intersection of 15th Street and Constitution Ave., NW, stalling cars in the street, Monday, July 8, 2019, in Washington. (Photo: Alex Brandon/AP)
An abandoned car is left after the rain storm on Canal Road on July 8, 2019 in Washington, D.C. (Photo: Brendan Smialowski/AFP/Getty Images)
Flood debris from the rain storm is seen on Canal Road on July 8, 2019 in Washington, D.C. (Photo: Brendan Smialowski/AFP/Getty Images)
A park bench and sidewalk are flooded from the rising high tide on July 2, 2019 in Washington, D.C. (Photo: Mark Wilson/Getty Images)
Heavy rainfall flooded the intersection of 15th Street and Constitution Ave., NW stalling cars in the street, Monday, July 8, 2019, in Washington. (Photo: Alex Brandon/AP)