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)