Flash Flood — Middlesex, Connecticut

2018-09-25 · near Moodus, Middlesex, Connecticut

Event narrative

The Neptune Avenue bridge in East Haddam was washed out due to flash flooding.

Wider weather episode

Rain developed across the area ahead of an approaching warm front, consolidating into a slow-moving band of heavy rain west of New York City that advanced eastward across southern Connecticut during the afternoon and evening. Precipitable water values increased from 1.84 on the morning sounding from Upton, NY to 2.13 by evening. Both of these values are above the 90th percentile based on a sounding climatology, with the 2.13 precipitable water value on the evening of the 25th a record for the date. Widespread rainfall amounts of 4 inches or more were reported across southern Connecticut with flash flooding resulting in numerous water rescues. A trained spotter in Trubmull received 7.32 inches of rain during the event, while a HAM radio operator in Lebanon received 6.79 inches. Automated stations near Durham and Hamden reported 7.24 and 8.59 inches of rain, respectively.

View location on OpenStreetMap → (41.4976, -72.4608)

Source: NOAA Storm Events Database, event_id 784731. Narrative written by the NWS forecast office that issued the report.