Flood — Hillsborough, New Hampshire

2025-05-10 · near Lyndeborough, Hillsborough, New Hampshire

Event narrative

Heavy rainfall with locally up to three inches on saturated soils caused Cold Brook to flood 2nd NH Turnpike in New Boston.

Wider weather episode

A slow moving low pressure system tracked across the region between the 9th and the 10th. The region was vulnerable to flooding due to saturated ground conditions and elevated stream flows from days of on and off again rainfall. The event was drawn out with a fairly steady rain with rates <0.5/hr. There was a period of heavier rainfall as the system received jet enhancement as it lifted to the northeast. Rainfall amounts were measured between 2 and 3 inches, primarily across Hillsborough County New Hampshire. Some small streams came out of banks causing flooding around Milford, Amherst, and Lyndeborough.

View location on OpenStreetMap → (42.9400, -71.7400)

Source: NOAA Storm Events Database, event_id 1267994. Narrative written by the NWS forecast office that issued the report.