Flash Flood — Grafton, New Hampshire

2017-07-01 · near Hanover Center, Grafton, New Hampshire

$6.0M

Property damage

Event narrative

Two to three inches of rain fell in a short period of time in Lyme causing stream flooding and road washouts.

Wider weather episode

A very strong shortwave and associated cold front were approaching from the west on the morning of July 1st. Ahead of the front, a very warm and moist air mass was in place over New England with values of precipitable water around 2 inches. Strong directional and speed shear contributed to numerous super cells that produced damaging winds. In addition, very heavy rain associated with these cells produced extensive flash flooding to many area roads with damage totaling in the millions.

View location on OpenStreetMap → (43.8208, -72.1534)

Source: NOAA Storm Events Database, event_id 715666. Narrative written by the NWS forecast office that issued the report.