Flash Flood — Carroll, Maryland

2025-07-09 · near Woodstock, Carroll, Maryland

Event narrative

South Branch Patapsco River flowing across Gaither Road at Howard County Line.

Wider weather episode

An anomalously moist airmass ahead of a frontal boundary sparked numerous showers and thunderstorms across Maryland. Instantaneous rain rates approached five to six inches an hour in the bigger storms. Storm total rainfall of one and a half to four inches resulted in flooding and flash flooding in areas throughout the evening of July 9th.

View location on OpenStreetMap → (39.3583, -76.9931)

Source: NOAA Storm Events Database, event_id 1261984. Narrative written by the NWS forecast office that issued the report.