Flash Flood in Northumberland County, Pennsylvania

Flash Flood July 9, 2023 · Northumberland County, Pennsylvania

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Heavy rainfall estimated around 3 inches led to the closure of Route 61 between Highland Avenue in Sunbury and Green Street in Upper Augusta Township due to flash flooding.

The wider storm

Showers and thunderstorms developed in a warm and humid airmass over central Pennsylvania with moderate CAPE and very little CIN ahead of an approaching cold front. A few of the storms produced sporadic wind damage, and the widespread nature of this activity allowed the event to evolve into a flash flooding threat as well.

Began near Sunbury (40.8588, -76.7772).

Source: NOAA Storm Events Database, event 1107098. Narratives are written by the National Weather Service forecast office that issued the report.

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