. Compendium of meteorology. Meteorology. 592 MECHANICS OF PRESSURE SYSTEMS streamlines in the col over the central United States on November 7, 1500Z, fulfill that condition fairly well. The mentioned geostrophic departure towards low pressure on the warm side of the col also favors the transportation of the isotherms towards the axis of dilatation. As a result of these processes a surface front has formed on November 8, 1500Z, over the region previously occupied by the col, while frontogenesis is in progress over the Great Lakes region where the col has now arrived. A frontal wave has alread
. Compendium of meteorology. Meteorology. 592 MECHANICS OF PRESSURE SYSTEMS streamlines in the col over the central United States on November 7, 1500Z, fulfill that condition fairly well. The mentioned geostrophic departure towards low pressure on the warm side of the col also favors the transportation of the isotherms towards the axis of dilatation. As a result of these processes a surface front has formed on November 8, 1500Z, over the region previously occupied by the col, while frontogenesis is in progress over the Great Lakes region where the col has now arrived. A frontal wave has already formed over the state of Missouri and is represented in the pressure field by a small elongated low. During the the foehn air over Dodge City. The foehn on the warm side of the col gives the frontogenesis a good start in the layers below the level of the continental divide, but the process also takes place higher up, as shown by the isothermalcy between 600 and 560 mb at Rapid City. The thermodynamics of upgliding in the sloping frontal zone can be tested through an inspection of the 293° dry-isentrope which has been inserted in Fig. 11. It shows that a particle could be brought dry-adia- batically along the profile from near the ground in Oklahoma to the tropopause at 350 mb over Montana without being subject to stabilizing gravity effects. If RAP LBF DDC OKC FTW RAPID NORTH DODGE OKLA. FORT CITY PLATTE CITY CITY WORTH. (zflj-5^ rr^^^^ "S"i~ -4 -I 10 sec. 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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