The First Tornadic Hook Echo Weather Radar Observations | 150 Engage Illinois Office of Corporate Relations
Celebrating our Sesquicentennial 1867-2017
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The Illinois State Water Survey played a key role in developing tornado-tracking technology used today to issue warnings of impending severe storms. On April 9, 1953, ISWS meteorologists were the first to photograph and document a hook echo, a classic sign of tornado development. On that day, the radar showed a large hook-shaped echo emerging from a thunderstorm passing Champaign. The echo turned out to be the funnel of a large, developing tornado that moved 54 miles to the east. This was a nationally noted event, and helped launch a national research program aimed at tornado detection by radar.

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Apr 09, 1953
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The First Tornadic Hook Echo Weather Radar Observations
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