Definition of a tropical depression, according to NOAA

“Tropical cyclones with maximum sustained surface winds of less than 17 m/s (34 kt, 39 mph) are usually called “tropical depressions” (This is not to be confused with the condition mid-latitude people get during a long, cold and grey winter wishing they could be closer to the equator ;-)).”

https://www.aoml.noaa.gov/hrd/tcfaq/A1.html

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