Flash Flood — Hillsborough, New Hampshire

2025-07-12 · near Clinton Vlg, Hillsborough, New Hampshire

Event narrative

Very heavy rain occurred with 2 to 3 estimated to have fallen in around 1 hour. Excessive run-off caused culverts to become overwhelmed with road damage and flooding being reported at Stoddard Rd, Depot Rd, and Rt. 123 in Hancock.

Wider weather episode

A hot and moist airmass was firmly in place across Southern New Hampshire on July 12th. Overall instability was limited but terrain driven thunderstorms did develop around Mount Monadnock and trained over this region. Localized road damage due flash flooding was reported.

View location on OpenStreetMap → (43.0077, -72.0540)

Source: NOAA Storm Events Database, event_id 1288480. Narrative written by the NWS forecast office that issued the report.