Jeanne is not yet a hurricane - just a Tropical Storm.
Classroom time:
These are terms used to describe the progressive levels of organized disturbed weather in the tropics that are of less than hurricane status.
• Tropical Disturbance A discrete tropical weather system of apparently organized convection - generally 200 to 600 km (100 to 300 nmi) in diameter - originating in the tropics or subtropics, having a nonfrontal migratory character, and maintaining its identity for 24 hours or more. It may or may not be associated with a detectable perturbation of the wind field. Disturbances associated with perturbations in the wind field and progressing through the tropics from east to west are also known as easterly waves .
• Tropical Depression A tropical cyclone in which the maximum sustained wind speed (using the U.S. 1 minute average standard) is 33 kt (38 mph, 18 m/s) or less. Depressions have a closed circulation.
• Tropical Storm A tropical cyclone in which the maximum sustained surface wind speed (using the U.S. 1 minute average standard) ranges from 34 kt (39 mph,19 m/s) to 63 kt (73 mph, 34 m/s). The convection in tropical storms is usually more concentrated near the center with outer rainfall organizing into distinct bands.
• Hurricane When winds in a tropical cyclone equal or exceed 64 kt (74 mph, 35 m/s) it is called a hurricane (in the Atlantic and eastern and central Pacific Oceans). Hurricanes are further designated by categories on the Saffir-Simpson scale. Hurricanes in categories 3, 4, 5 are known as Major Hurricanes or Intense Hurricanes.
Edited, Tue Sep 14 15:05:34 2004 by Mikeinsb