Waterspout potential forecast maps for both North America and Great Lakes sectors. 
Waterspout Index color key: The warmer the color, the higher the waterspout potential. Note: Waterspouts occur when both waterspout potential and low-level convergence (i.e. fronts, troughs, land breezes, etc.) are present.

North America Waterspout Potential Forecast (3 hour time steps starting at 2 am EDT, May 18 to 2 pm EDT May 19)

Great Lakes Waterspout Potential Forecast (Beginning July 1)