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Marine Thunderstorm Wind · Lake Michigan
Marine Thunderstorm Wind July 21, 2004 · Calumet Hbr Il To Gary in, Lake Michigan
What the National Weather Service wrote
Wind measured at the Trump Casino boat.
The wider storm
In the early afternoon of July 21, thunderstorms began to develop over northeastern Illinois. A small area of strong thunderstorms initially developed over the western Chicago suburbs and rapidly developed into a line of severe storms extending over southern Lake Michigan and the eastern metro area. The line of storms rapidly moved eastward into northwestern Indiana and southeastern Lake Michigan. Strong wind gusts, up to 60 mph, were also measured by the coastal observing stations.
Source: NOAA Storm Events Database, event 5414283. Narratives are written by the National Weather Service forecast office that issued the report.
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