Flash Flood — Nassau, New York

2024-08-06 · near Locust Vly, Nassau, New York

Event narrative

Nassau County Emergency Management reports multiple vehicles stuck in flood waters with ongoing rescues in Locust Valley.

Wider weather episode

Several rounds of heavy thunderstorms developed over the area on the afternoon of August 6th. A slow moving frontal system stalled out over the area. PWATs of 2-2.2 inches and a sharp gradient of MUCAPE peaking out over the area near 2500 J/kg allowed for the development of strong thunderstorms producing torrential rainfall with rates upwards of 1.5-2.5 inches per hour. Total rainfall was 1-3 inches with localized amount up to 4-5 inches.

View location on OpenStreetMap → (40.8800, -73.5800)

Source: NOAA Storm Events Database, event_id 1212544. Narrative written by the NWS forecast office that issued the report.