A fast-moving line of severe thunderstorms swept across central Maryland and the Washington, D.C., region on the evening of 9 July, bringing wind gusts measured at more than 60 mph, torrential rain and frequent lightning. Forecasters tracked the storms racing east at about 20 mph after they developed over the mountains earlier in the afternoon, reaching the Baltimore metropolitan area during the evening rush hour and prompting warnings for Frederick, Harford, Anne Arundel and Kent counties. The strongest cell passing near Washington, D.C., triggered at least one tornado warning before moving toward the Chesapeake Bay, while separate warnings for flash flooding and damaging straight-line winds covered much of the I-95 corridor. Radar indicated localized roadway flooding and the potential for waterspouts over the bay. As the squall line advanced, residents captured images of a dramatic shelf cloud rolling over Bowie, Maryland—an indicator of the storm’s intense outflow boundary. Authorities urged commuters to delay travel until the system cleared the area, cautioning that additional thunderstorms remained possible overnight.