Flooding on Main Street in Ellicott City swelled to the point that it nearly reached the top of a stop sign, The Baltimore Sun reports.
Maryland Gov. Larry Hogan says he has signed an executive order declaring a state of emergency in response to severe flooding in Ellicott City and areas across the state.
Mr Kittleman said there have been no reports of injuries but added the situation was still developing and more rain is expected.
Footage of Sunday's flash flooding in Ellicott City, Maryland, shows water surging around cars and pickup trucks. The National Weather Service issued a flash flood emergency late in the afternoon for Ellicott City, a town 10 miles west of Baltimore, warning of an "extremely risky and potentially catastrophic situation". Just to the south of Ellicott City, radar indicated as much as 7 to 8 inches had fallen - which is an incredible amount of rain in such a short amount of time.
Jeff Halveson, professor of meteorology at the University of Maryland at Baltimore County and a contributor to the Capital Weather Gang, said the storm pattern had essentially stalled over Ellicott City, the same phenomenon that caused massive flooding in the City of Frederick two weeks ago.
Kittleman said the damage was significant and appeared to him to be worse than the flooding two years ago. Others said they gathered in the second story of a building to anxiously watch the seething waters. Those seeking shelter can go to the Roger Carter Community Center at 3000 Milltowne Drive.
Heavy flooding has been reported on Main Street-that's the same street where flash flooding turned the street into a deadly river in July 2016.
A Baltimore suburb was placed under a state of emergency on Sunday as flash floods inundated streets with several feet of water.
If you're affected by the storm and in need of non-emergency assistance, you can call Howard County Police Department at 410-313-2200.
Meanwhile, some roads were also flooded in neighboring Baltimore County. A spokeswoman in Baltimore County said the fire department has received dozens of calls about cars stuck in high water and flooded basements.