Jul 27, 2020
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 s
Source: NOAA National Weather Service Storm Events Database (event 912591). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Orleans County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.