File:Tropical Storm Four (1970).JPG
Tropical Storm Four of 1970 on August 18th. At the time of the picture, the storm displayed many features similar to those of hurricanes, leading to the possibility of "Four" being a hurricane.
Source: http://docs.lib.noaa.gov/rescue/mwr/099/mwr-099-12-0966.pdf
This image is in the public domain because it contains materials that originally came from the U.S. National Oceanic and Atmospheric Administration, taken or made as part of an employee's official duties.
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