Pneumonia Front
The term Pneumonia front, first coined by the National Weather Service in Milwaukee, Wisconsin, Milwaukee in the 1960s, is used to describe a rare meteorological phenomenon observed on the western shoreline of Lake Michigan during Spring and early Summer. These fronts are defined as lake-modified synoptic scale cold fronts that result in one-hour temperature drops of 16 °F (8.9 °C) or greater. They do not necessarily have to be synoptic, or large scale, cold fronts. Pneumonia fronts are most common between the months of April to July when the temperature difference between the cold lake waters and the warmer air over land can be as much as . Under weak prevailing winds, a density current can often develop in the form of a lake breeze that moves from that water to the adjacent shoreline and several miles inland. This "lake-breeze cold front" can drop temperature in places like Chicago, Illinois, Chicago, Milwaukee, Wisconsin, Milwaukee, Benton Harbor, Michigan, Benton Ha ...
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