Its location in the Patapsco River Valley and its position on a granite bedrock make it susceptible to flooding "with terrific force", Mr. Miller said. The Howard County Fire & EMS agency tweeted that water was above the first floor of some buildings at the height of the disaster.
Jessica Ur, a server at a cafe on the city's Main Street, told The Baltimore Sun she saw the gushing brown waters carry three or four parked cars down the street. There was no immediate report of any injuries.
Emergency management officials urged people to avoid downtown Ellicott City.
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President Donald Trump's recent back and forth on the potential summit with North Korean leader Kim Jong Un in Singapore. Bush administration, said he anxious that Trump might be at a disadvantage in a face-to-face negotiation with Kim.
The National Weather Service said a flash flood warning has been issued for the area, calling it an "extremely risky situation" and urging motorists not to attempt to navigate flooded roads.
With Ellicott City ravaged by floodwaters for the second time in since 2016, relief efforts are already underway for those businesses and residents affected. Meteorologists called the rainfall a rare "1-in-1,000-year event" that has been happening with unprecedented frequency in recent years.
The same account later posted a photo of a rescue team helping people escape they're flooding apartments, as the lower level of the city's Main Street was nearly completely submerged. Two residents died in the flood waters.
Some of those scenes of physical devastation appear to have repeated themselves Sunday.
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Some humanitarian aid from Saudi Arabia and the United Arab Emirates arrived on the island just hours after the cyclone receded. More than 30 people including Indians are missing in Oman since Cyclone Mekunu made landfall on Friday, officials said.
State emergency officials warn that those in the Ellicott City area remains indoors and stay off the roads until the storm passes, and said to refrain from standing around the area to watch rescues.
Multiple area fire and rescue crews, including Montgomery and Prince George's Counties, worked to help people stranded in their homes in the area. They're saying rescuers will come to help.
The Roger Carter Community Center is open for those who need a place to shelter.
During an evening news conference, Howard County executive Allan Kittleman said authorities were not aware of any fatalities or missing people.
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Some Baltimore County roads also have been flooded. It was not that high last time, she said.