Heavy Rain in Orleans County, New York
Heavy Rain July 27, 2020 · Orleans County, New York
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
Rainfall of 2.16 inches was reported in less than three hours.
The wider storm
A hot and very moist air mass was in place across the region with dewpoints in the 70s and precipitable water values approaching 2 inches. Diurnal instability along a lake breeze boundary allowed for convection to develop. The most notable thing about these boundaries was the intersection of the boundary off of Lake Erie with a weaker one south of Lake Ontario. Thunderstorms developed and trained along this intersection for hours. The net result was some of the heaviest rains our area has ever seen in such a short duration with amounts of between 7 and 8 inches reported in Orleans County.
Began near Knowlesville (43.2300, -78.3100).
Source: NOAA Storm Events Database, event 912654. Narratives are written by the National Weather Service forecast office that issued the report.
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