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Timeline: How Ellicott City flooded in 2016

The floodwaters that inundated Ellicott City came with a warning, but still took its historic Main Street district by surprise. Witnesses described waters rising several feet in a matter of minutes.

6:45 p.m.: Rain begins to fall in Ellicott City.

7:18 p.m.: National Weather Service issues flash flood warning across Howard County, Baltimore and southern Baltimore County.

7:30 p.m.: Heaviest rain moves in to Ellicott City, with 4.56 inches of rain over the next hour.

8:15 p.m.: Patapsco River begins to swell, rising 6 feet in an hour.

8:45 p.m.: As rain tapers off, floodwaters begin to surge down Main Street, with nearly 6 inches of precipitation in two hours.

9 p.m.: As the flash flooding on Main Street eases, the Patapsco River crests, rising 14 feet in an hour and a half.

11:59 p.m.: Floodwaters subsided, Howard County Executive Allan Kittleman calls for a state of emergency.

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