The Experimental Great Lakes Waterspout Forecast displays waterspout potential and is based on the Szilagyi Waterspout Index (SWI). Red and yellow areas on the map represent areas of waterspout potential with and without low-level convergence respectively. Red areas are more likely to see waterspouts as compared to yellow areas.

Small craft boating season is over for the Great Lakes. Waterspout forecasts will resume on August 1, 2018