Flash Flood in Rockland County, New York

Flash Flood December 18, 2023 · Rockland County, New York

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

What the National Weather Service wrote

Flooding and road closure on NY 303 in both directions in Clarkstown.

The wider storm

A warm front ahead of a developing coastal low pressure system positions itself over the area late on December 17th and into December 18th. As the low pressure intensified and approached, significant amounts of moisture focused along the warm front ahead of the coastal low resulting in widespread areas of heavy rainfall that occurred over a 12-18 hour period. PWATs were 1.5-1.7 inches which were near record values. A widespread 2-5 inches of rain fell over the area. This resulted in many areas of flash flooding as well as significant rises in rivers.

Began near Central Nyack (41.0900, -73.9500).

Source: NOAA Storm Events Database, event 1154089. Narratives are written by the National Weather Service forecast office that issued the report.

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