Pat Shingleton: "Wind Setdown?"
Sunday's column noted an example of "wind setdown" when strong winds blow over water, shifting the water body downward and dropping the water level on the upwind shore. Weatherwise Magazine identified an episode of "wind setdown" in 1882 when Major General Sir Alexander B. Tullock was surveying coastal areas of the Red Sea. His experience was comparable to that of Moses in 1250 B.C. Researchers believe that "wind setdown" is comparable to a hurricane's storm surge. Every few years, on the western end of Lake Erie, "wind setdown" events have dropped the lake 2 meters. At Cedar Key Harbor in Florida on September 6, 2004, a 1 meter drop in water level occurred as Hurricane Frances passed. It then rose 1.5 meters above sea level in nine hours.
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