Numerous waterspouts were reported off the shores of Milwaukee and Chicago over Lake Michigan Saturday. As I talked about before very cold air associated with a very strong closed upper level low moved over the relatively warm waters of Lake Michigan. As this happens the warmer air below quickly rises because it's warmer than the air it's moving into. The very rapid vertical motion helps generate increased instability within the thunderstorms. The Chicago National Weather Service put together a very detailed description on the types of forecasting tools they use to forecast waterspouts.
Courtesy: Fox6 Milwaukee
courtesy: TMJ4 Milwaukee
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