Jun 8, 2021
A passing shortwave combined with a surface trough resulted in the development of showers and thunderstorms across the Lower Hudson Valley during the early afternoon hours. These thunderstorms developed in an environment with weak steering flow and high precipitable water values, resulting in several reports of flash flooding. Based on upper air soundings from Upton, NY, precipitable water values increased from around 1.75 inches on the morning of June 8th to just over 2 inches that evening. Rai
Source: NOAA National Weather Service Storm Events Database (event 968905). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Rockland County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.