NOWCAST

NOWCAST 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bulletin of the American Meteorological Society American Meteorological Society

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0477
D.O.I.
10.1175/BAMS-85-7-935
Publisher site
See Article on Publisher Site

Abstract

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

Journal

Bulletin of the American Meteorological SocietyAmerican Meteorological Society

Published: Jul 1, 2004

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