Experimental Great Lakes Waterspout Forecast
The experimental Great Lakes waterspout forecast displays waterspout potential using the Szilagyi Waterspout Index (SWI). The SWI ranges from -10 to +10, where values greater than or equal to zero represent conditions favorable for waterspout development. Only values of SWI that are equal to or greater than zero are plotted on the forecast maps.
Boating season has ended
Waterspout forecasts will resume on July 1, 2017