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Stages of Development from disturbance to hurricane Tropical Depression: If sustained winds increase to at least 20 knots, a disturbance is upgraded to a tropical depression. Surface wind speeds vary between 20 and 34 knots and a tropical depression has at least one closed isobar that accompanies a drop in pressure in the center of the storm. Terms for using data resources. CD-ROM available. Credits and Acknowledgments for WW2010. Department of Atmospheric Sciences (DAS) at the University of Illinois at Urbana-Champaign.