. Compendium of meteorology. Meteorology. Fig. 76.—Sea-level chart at about 0600 GMT, March 20, 1945. was shallow and weak and the air above was quite dry, particularly at 550 to 600 mb, where the frost-point depression was 32C. On March 20th, the dry layer at the inversion was well marked and it was accentuated by the moistness of the air above. If the surface synop- tic charts are compared, the ascent of the 18th is seen to have been made in a weak warm sector with falling barometer, while the ascent of the 20th was made in a ridge. This would seem to contradict the relative dry- ness of the
. Compendium of meteorology. Meteorology. Fig. 76.—Sea-level chart at about 0600 GMT, March 20, 1945. was shallow and weak and the air above was quite dry, particularly at 550 to 600 mb, where the frost-point depression was 32C. On March 20th, the dry layer at the inversion was well marked and it was accentuated by the moistness of the air above. If the surface synop- tic charts are compared, the ascent of the 18th is seen to have been made in a weak warm sector with falling barometer, while the ascent of the 20th was made in a ridge. This would seem to contradict the relative dry- ness of the upper air on the 18th. On the 500-mb charts, however, the position is reversed. The dry air observed on the 18th between 700 and 500 mb is seen to be in an upper-air ridge, while the moister air of the 20th is in an upper-air trough. Figures 10a and 10& give another example of an as- cent in an anticyclone. Intrusion of Moist Air Tongues into Drij Air. The ascent of June 7, 1943 (Fig. 8a with the surface synop- tic chart Fig. 8&) was made in a ridge in advance of a weak frontal system which is shown on the charts as having a double structure. The nature of the frost-point. MB TEPHIGRAM 7-JUNE-43 1200 GMT Fig. 8o.—Ascent showing moist air tongue intruding into dry air, 1200 GMT, June 7,'1943. Ascent made over southern England at approximately 5rN 2° Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Meteorological Society. Committee on the Compendium of Meteorology; Malone, Thomas F. Boston : American Meteorological Society
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