File:Aerographer's Mate 3 and 2 (1976) (17946284981).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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AEROGRAPHER'S MATE 3 & 2
Text Appearing After Image:
Figure 14-24, — Satellite picture depicting ITCZ in the eastern Atlantic Ocean, 209.375 degree of convergence between the two air currents. The zone of disturbed weather may be as little as 20 to 30 miles in width or as much as 300 miles. Under typical conditions, frequent rainstorms, cumulus and cumulonimbus type clouds and local thunderstorms occur. Violent turbulence may be associated within these storms. Cloud bases may lower to below 1,000 feet, or even be indistinguishable, in heavy showers. Their tops frequently exceed 40,000 feet. An extensive layer of altocumulus and altostratus usually occurs due to the spreading out of the upper parts of the clouds. These clouds vary in height and thickness with the currents of the air masses. At higher levels a broad deck of cirrostratus spreads out on both sides of the zone. Visibility is generally good except when reduced by heavy rain shower activity. Surface wind in the vicinity of the ITCZ is generally squally in the heavy shower areas. Ice formation in the heavy cloud masses associated with the ITCZ is likely to reach serious proportions when pilots are flying at altitudes above 15,000 feet. (This is roughly the average freezing level in equatorial regions.) The intensity of the ITCZ varies inter- diurnally, from day to day and to a lesser degree annually. Over ocean areas, precipitation reaches its maximum just before dawn with a minimum occurring late in the morning or early after- noon. Over land areas the reverse is true, except on coastal areas when the wind has an onshore component. In this case the diurnal maximum of precipitation takes place in the early morning. (See fig. 14-25.) 338

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