
A Lake Michigan waterspout seen from Lakeshore State Park in Milwaukee Saturday.
Lake Michigan could churn up isolated waterspouts again today, the Grand Rapids National Weather Service office said in its hazardous weather and nearshore marine forecasts.
Cold unstable air and warm water, creating a 25 degree temperature difference, were the two important ingredients that came together Saturday, the National Weather Service said.
The conditions produced "a rare outbreak of waterspouts stretching from off shore of Milwaukee, south to the Chicagoland area," the NWS Milwaukee office said. Its full explanation and more photos are available here.
The NWS office in Chicago explains how meteorologists forecast waterspouts here.












