Flash Flood — Hillsborough, New Hampshire

2024-08-04 · near (mht)manchester Muni, Hillsborough, New Hampshire

Event narrative

Heavy rainfall with rainfall rates estimated around 3 per hour cause rapid runoff in the City of Manchester. Water entered some first floor of half a dozen businesses and residences. Severe flooding along Amherst Street, Conant Street, Main street near stone bridge, Rimmon Street, Beech Street, Cilley Street, South Willow Street at the end of Union Street in Central Manchester. Fire Chief estimates around 2 dozen water rescues were conducted across the City.

Wider weather episode

An upper level disturbance brought multiply rounds of showers and thunderstorms on August 4th, as amble low level moisture and instability was in place over New Hampshire. Most storms were strong with heavy downpours and gusty winds, with scattered storms causing wind damage along with an isolated area of flash flooding. Slow-moving showers and storms produced flash flooding across portions of southern New Hampshire. Heavy rainfall rates over 2-3' per hour resulted in local accumulations over 3 inches across the City of Manchester.

View location on OpenStreetMap → (42.9432, -71.4129)

Source: NOAA Storm Events Database, event_id 1201105. Narrative written by the NWS forecast office that issued the report.