Flash Flood — Somerset, New Jersey

2021-09-01 · near Branchburg Park, Somerset, New Jersey

Event narrative

Widespread flash flooding occurred in the southern half of Somerset County with numerous road closures. There were two flood related fatalities in southern Somerset County, both in Hillsborough Township. There were approximately 1200 water rescues in the entire county. Many buildings and homes were either damaged or destroyed by the flood waters. Most waterways in the county overflowed their banks, including the Raritan River, the Millstone River, Green Brook, Stony Brook and Middle Brook.

Wider weather episode

Post Tropical Cyclone Ida brought heavy rain to New Jersey on September 1. Rainfall totals were as high as 5 to 10 inches. The heavy rain caused significant flash flooding, mainly in the northern half of the state. It resulted in widespread property damage. There were several fatalities.

View location on OpenStreetMap → (40.5774, -74.7004)

Source: NOAA Storm Events Database, event_id 986282. Narrative written by the NWS forecast office that issued the report.