What causes small waterspouts?
Fair- weather waterspouts are formed on warm sunny days, when there is unstable air above athe lake and a slight breeze above the land. As the air warms and rises, air flows in from all directions to fill the slightly lowered pressure formed over that spot. Rapidly rising air is not enough to initiate a waterspout. Topography and local breezes from the shore to the lake contribute or inhibit the development of these fair- weather mini- waterspouts as well.