The following events were reported: Thunderstorm Wind. These occurred near station USW00013743, approximately 22.3738 km away, between 2021-08-11 15:44:00 and 2021-08-11 15:55:00. The events included records with estimated wind gusts of 55.0 mph.The events resulted in 1 injuries and 0 fatalities. The events caused property damage valued at 509000.0 and crop damage of 0.0. Episode Narrative: A lee pressure trough and weak cold front combined to ignite numerous thunderstorms in a strongly unstable environment. The strongest thunderstorms produced severe wind gusts and sporadic hail. A lee pressure trough and weak cold front combined to ignite numerous thunderstorms in a strongly unstable environment. Event Narrative: Trees blew down on MD-28 Norbeck Road at Carrolton Road, and on MD-97 Georgia Avenue at International Drive. Dozens of trees, large branches and wires blew down in the Bethesda, Kensington and Chevy Chase area. Wires blew down in the 5500 block of Johnson Avenue. Trees blew down onto wires on MD-187 Old Georgetown Road at Bell Mills Road. Trees blew down on I-495 Capital Beltway near Exit 33/MD-185 Connecticut Avenue, and between Exit 34/MD-355 Rockville Pike and Exit 35/I-270 Washington National Pike blocking the entire Inner Loop. Trees blew down on southbound MD-355 Rockville Pike at I-495 Capital Beltway and south of Tuckerman Lane. A large tree fell and took down wires near the intersection of Whittier Boulevard and Orchid Drive. Several large trees and branches took down wires and several transformers in the 5700 block of Grosvenor Lane, damaging several utility poles. A few large trees blew down near the intersection of Beech Avenue and MD-187 Old Georgetown Road. A tree blew down onto a house on Lundigan Court. A tree fell onto a vehicle and wires on Alta Vista Road, and a pedestrian was injured when they were struck by flying debris. Some homes suffered damage from falling trees on Chatsworth Drive, Farnham Road, and Rossmore Road. Multiple large trees blew down blocking Fernwood Road near I-495 Capital Beltway. Numerous trees were blown down near the Wildwood Shopping Center. A large tree fell onto wires and a house causing significant structural damage in the 10400 block of Muir Place; another large tree blew onto a house causing significant structural damage in the 5200 block of Acacia Avenue. Multiple trees and wires blew down in the 6000 block of Chatsworth Lane. A tree fell onto wires and a house on York Lane near Overhill Road. A tree blew down on Tuckerman Lane near Whisperwood Lane. A tree blew down onto a house in the 10100 block of Wildwood Road. Trees and wires blew down in the 10000 block of Weymouth Street. A tree blew down onto an unoccupied vehicle on I-495 Capital Beltway Inner Loop between Exit 33/MD-185 Connecticut Avenue and Exit 35/I-270 Washington National Pike. Wires blew down in the 10100 block of Ashburton Lane. Several trees, large branches and wires blew down near Silver Spring and Takoma Park. Trees blew down on eastbound I-495 Capital Beltway Inner Loop at Exit 30B/US-29 Colesville Road. Large tree limbs blew down on Forest Glen Road near Holy Cross Hospital. A tree blew down on westbound MD-410 East-West Highway just past US-29 Georgia Avenue. Wires blew down in the 1600 block of Oaklawn Court.