Thunderstorm Wind — Sullivan, New Hampshire

2023-08-04 · near North Grantham, Sullivan, New Hampshire

Event narrative

Convective outflow winds from a severe thunderstorm downed numerous trees in the town of Gantham along Interstate 89.

Wider weather episode

A weak low pressure system approached Western New Hampshire with southerly flow ahead of the feature advecting abundant moisture and instability into the region ahead of it. Cool upper levels allowed for thunderstorms to quickly develop by midday with the atmosphere supporting large hail formation and gusty outflow convective winds. Storms quickly become severe in Grafton and Sullivan Counties by early afternoon. Many hail and wind damage reports were received across this area during the afternoon hours.

View location on OpenStreetMap → (43.5200, -72.1400)

Source: NOAA Storm Events Database, event_id 1138583. Narrative written by the NWS forecast office that issued the report.