Flash Flood — Allegany, New York

2025-07-16 · near Stone Dam, Allegany, New York

Event narrative

Water flowing across a portion of County Road 29 in Alma.

Wider weather episode

A shortwave trough and attendant surface cold front impinging on a weak shear, but very warm and moisture-laden atmosphere led to the development of showers and thunderstorms late in the day into the evening hours which produced isolated severe winds and flash flooding.

View location on OpenStreetMap → (42.0200, -77.9500)

Source: NOAA Storm Events Database, event_id 1286821. Narrative written by the NWS forecast office that issued the report.