Marine Thunderstorm Wind — Great Egg Inlet To Cp May Nj Out 20nm, Atlantic North

2009-09-11 · near Avalon, Great Egg Inlet To Cp May Nj Out 20nm, Atlantic North

Event narrative

A thunderstorm produced a wind gust to 45 knots (52 mph) in Avalon.

Wider weather episode

A low pressure system that formed off the Carolina coast on the 6th meandered slowly northeast into the 10th before it started to retrograde toward the Delaware and New Jersey coasts the night of the 10th. The low pressure system moved into Delaware Bay and made landfall in Delaware during the morning of the 11th. From there it slowly weakened as it moved into the Delaware River Valley later on the 11th into the 12th. The pressure gradient (difference) caused by a high pressure system over eastern New England and the Canadian Maritimes and the low pressure produced strong northeast winds that peaked during the first half of the day on the 11th. The ocean waters in the nearby Atlantic were still relatively warm and permitted thunderstorms to develop. The thunderstorms moved west with the surface low and exacerbated the already strong gradient winds when they occurred during the morning of the 11th.

View location on OpenStreetMap → (39.0988, -74.7133)

Source: NOAA Storm Events Database, event_id 196195. Narrative written by the NWS forecast office that issued the report.