High water blocked roads and intersections Monday night in Montgomery and Fairfax counties, as heavy rain pelted the Washington region, causing sudden floods.

Trees toppled, electric wires came down and hailstones as big as golf balls were reported, not just in one or two areas, but in many parts of the region.

More than an inch of rain fell in an hour in some spots.

Many occupants were extricated from cars stalled by rising water along major roads in Montgomery, including Falls Road in the Potomac area, Parklawn Drive in the Rockville area and Newport Mill Road in the Wheaton area.

In Fairfax County, authorities were trying Monday night to help occupants of a car stalled in the Great Falls area, at Walker Mill Road and Manning Street, to name only one spot.

More than 9,000 homes and businesses in the District and the Maryland suburbs had lost electricity at one point, according to Pepco data.

The figure in Northern Virginia was about 2,000.

Trees fell in the District in the Foggy Bottom area at 21st and F streets, and at Loughboro and Chain Bridge roads in the city’s northwestern corner. One tree fell on several cars in the 5500 block of 13th Street NW.