Oct 21, 2016
A tropical airmass moving north ahead of an approaching cold front produced very heavy rainfall in just a two hour period across southern New Hampshire. Three to five inches of rain resulted in flash flooding in major urban centers including Manchester and Nashua. Water up to the hoods of cars was common and people had to be rescued from their vehicles.
Source: NOAA National Weather Service Storm Events Database (event 662728). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Hillsborough County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.