Falling trees and flooding closed roads and heavy winds knocked down power lines Friday morning as the remnants of Hurricane Debby moved through Montgomery County, according to local authorities.
On Friday afternoon, a large tree toppled across the northbound lanes of 16th Street at Second Avenue in Silver Spring. County police blocked vehicles from using that stretch of the road.
A fallen tree knocked down power lines and blocked Tilden Lane in Rockville between Cushman Road and Danville Drive at around 10:30 a.m., according to Montgomery County Fire and Rescue Service (MCFRS) spokesperson Pete Piringer.
In Silver Spring, another tree took down power lines and blocked 19200 New Hampshire Ave. between Windswept Lane and Haviland Mill Road, Piringer wrote on social media.
Maryland-National Capital Park Police reported on social media that Sligo Creek Parkway from Three Oaks to Wayne Avenue is closed due to flooding Friday morning. Additionally, the parking lot of Meadowbrook Local Park in Chevy Chase closed due to flood water.
Earlier Friday, the National Weather Service issued a flash flood warning for eastern Montgomery County until 11:30 a.m.
“This is a dangerous and life-threatening situation,” the National Weather Service said in an alert Friday morning.

The weather service said radar “indicated thunderstorms producing heavy rain across the warned area. Between 0.5 and 1.5 inches of rain have fallen. The expected rainfall rate is 2.5 to 4.5 inches in 1 hour. Additional rainfall amounts of 1 to 2 inches are possible in the warned area.”
The weather services downgraded the flash flood warning to a flood watch at 10:30 a.m. The flood warning is in effect until 1:30 p.m.
In addition, the weather service issued a tornado watch until 2 p.m. for the county. The tornado watch was cancelled later in the morning.
The storm led to announcements of closures in the county.
Montgomery County Public Schools (MCPS) canceled transportation services Friday for students and non-public school students due to the storm. The summer school program at Richard Montgomery High School in Rockville and the innovative school year program at Arcola Elementary School in Silver Spring also closed, MCPS said. The district’s offices will remain open.
The Montgomery County Agricultural Fair cancelled its Friday opening and announced it would be open starting at 10 a.m. Saturday. The fair is scheduled to run through Aug. 17 at the fairgrounds at 501 Perry Parkway in Gaithersburg.
At Gaithersburg’s Bohrer Park, the water park, interactive water feature and miniature golf course are closed while drop-in skate park hours and Zumba in the Park are canceled, the city announced.
Meanwhile, homes in Potomac and Gaithersburg were struck by falling trees Friday night at remnants of Hurricane Debby brought heavy rain and strong winds to the county.
MCFRS crews responding to the 7800 block of Ivymount Terrace in Potomac around 9:20 p.m. found a tree had fallen on a two-story home, displacing four adults and two children, MCFRS spokesperson David Pazos wrote on social media. All escaped unharmed.
About 10 minutes later, MCFRS crews responded to the 19600 block of Enterprise way in Gaithersburg for a report of a tree falling on a house, Pazos wrote.
“Crews found a large tree on an end of the row [townhouse] with occupants inside safe and uninjured,” he wrote.
The tree caused minor structural damage to one bedroom, but the occupants were not displaced, he said.