Tropical Depression 02 : A cluster of thunderstorms in the tropics that maintains its identity and shows rotary circulation at the surface with constant wind speeds of 38 mph or less
National Weather Service NWS, Eastern Region Headquarters, A Guide To Developing A Severe Weather Emergency Plan For Schools (For Eastern Region Bohemia, NY), Appendix B: Glossary of Weather Terms (Hurricane), Baltimore-Washington Forecast Office, USA 2015. http://www.erh.noaa.gov/lwx/swep/swep.pdf, (ND/ Hurr Emr - Amer) {951}