TH E MAP ROOM THE IMPACT OF A SPLIT-FRONT RAIN BAN D ON APPALACHIAN COLD-AIR DAMMING EROSION BY MICHAEL J. BRENNAN, GAR Y M. LACKMANN, AND STEVEN E. KOC H split cold front is a cold front in the midtropo- sphere—usually centered near the 700-hPa A level—that is located at least 200 km ahead of the surface cold front, creating a forward-tipped cold front structure. This structure has been shown to fa- vor the development of convective precipitation along the upper-level cold front due to a thermally direct frontogenetical circulation that can provide the trig- ger for convective initiation. The split front is usually marked by a rapid decrease in moisture aloft during its passage, more so than temperature, so quantities FIG. I . Geographic features of Nort h Carolina and sur- such as 700-hPa equivalent-potential temperature (<9) rounding areas. or wetbulb potential temperature ( 0 ) are best to use for identification of a split front. Due to the drier air nas and Virginia. Operational forecast models have been and quasigeostrophic descent induced by cold advec- shown to erode the sensible weather effects of CAD too tion aloft behind the split front, the eventual passage quickly, and this
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Jul 1, 2004
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