Flash Flood — Putnam, New York

2023-07-09 to 2023-07-10 · near Mahopac Falls, Putnam, New York

Event narrative

DOT reports flooding on NY 6N both directions at Potter Road. All lanes blocked.

Wider weather episode

A stalled frontal boundary remained over the area which produced multiple rounds of torrential rainfall form heavy thunderstorms from July 9th through July 10th. CAPE values of 2500 to 3500 J/kg and PWAT values of near 1.8 allowed heavy thunderstorm development to produce rainfall rates of 2-3 inches per hour at times. There were parts of the area that receive anywhere from 3-5 inches of rain in a several hour period with some spots seeing upwards of 8 inches. This allowed for the issuance of a localized Flash Flood Emergency for portion of the Lower Hudson Valley.

View location on OpenStreetMap → (41.3700, -73.7700)

Source: NOAA Storm Events Database, event_id 1122087. Narrative written by the NWS forecast office that issued the report.