File:Aerographer's Mate 3 and 2 (1976) (17757766958).jpg

Title: Aerographer's Mate 3 & 2
Identifier: aerographersmate00nava (find matches)
Year: 1976 (1970s)
Authors: Naval Education and Training Program Development Center; United States. Bureau of Naval Personnel
Subjects: United States. Navy; Meteorology; Oceanography
Publisher: Washington : U. S. Dept. of Defense, Navy Dept. , Naval Education and Training Support Command
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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Chapter 14 —AIR MASSES AND FRONTS
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5°N IO°N 15°N Figure 14-25.—Weather conditions in an active portion of the ITCZ. 209.70 Seasonal Variation The use of mapped digital satellite data has improved the information of the seasonal meridional displacement of the cloud band associated with the ITCZ. The cloud pictures revealed that the cloud band has somewhat different characteristics in different parts of the world. In the Atlantic, it is centered about 3 degrees north in the winter season and moves to about 8 degrees north by late summer. In the Pacific, the seasonal fluctuations of the cloud band are not readily apparent east of 150 degrees west. Seasonal pressure changes over North America may be responsible for what seasonal shift of the ITCZ cloud band there is in the eastern Pacific. West of 150 degrees the movements are not well defined. The large area of relatively cloud-free skies during the winter season southwest of Central America and Mexico suggests that dry wintertime continental outflow pushes the ITCZ cloud band to the south in this area. There is some evidence of a weak second cloud band associated with the ITCZ along 5 degrees south, during the period January through March. It varies in strength from year to year, occasionally failing to develop at all. The ITCZ band of clouds in the Indian Ocean during the Southern Hemisphere summer is much broader in extent than either of the cloud bands found in the Atlantic or Pacific Oceans. TROPICAL CYCLONES The most widespread destructive weather phenomenon is the tropical cyclone, which each year claims lives and causes extensive damage. While a tornado exceeds the severity of a full- fledged tropical cyclone it is generally confined to a smaller area and has a comparatively short path and life duration. The tropical cyclone due to its greater horizontal extent and longer life, 339

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