caa a22 4500 469052279 CHVBK 20180323132833.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF01029572 doi (NATIONALLICENCE)springer-10.1007/BF01029572 Cold surges along the front range of the Rocky mountains: Development of a classification scheme [Elektronische Daten] [J. Mecikalski, J. Tilley] Summary: A classification scheme for cold surges occurring along the Front Range of the Rocky Mountains has been developed using NMC surface and upper air data. A separation is seen in the data between cases with "parent” anticyclones that moved from Canada south into the United States (Northern type) and those which moved from the Eastern Pacific Ocean east into the central US (Western type). The Northern surges are further broken down into three types, A, B and B′, when the degree of southward motion of the anticyclone and the leading edge of the cold air is considered. An anticyclone movement south of 40°N distinguishes type A, while anticyclone tracks remaining north of 40°N characterize types B and B′. The leading edge of the surge (the surge line) associated with the type A anticyclone travels south of 25δN, while the type B anticyclones produce two distinct surge line movements, one remaining north of 25°N and the other moving south of 25°N. It is not possible to break down the Western surges into distinct types. As a rule, the anticyclones associated with Western surges remain between 50°N and 30°N, with the surge line moving south to ∼18°N on average. Though the classification scheme is developed in a relatively subjective manner, the statistical robustness of the scheme is verified through application of the nonparametric Mann-Whitney test. Results of the test clearly provide support for the division of the surges that was obtained. Springer-Verlag, 1992 Mecikalski J. Department of Geosciences, The University of Wisconsin-Milwaukee, P.O. Box 413, 53201, Milwaukee, WI, USA aut Tilley J. Department of Geosciences, The University of Wisconsin-Milwaukee, P.O. Box 413, 53201, Milwaukee, WI, USA aut Meteorology and Atmospheric Physics Springer-Verlag 48/1-4(1992-03-01), 249-271 0177-7971 48:1-4<249 1992 48 703 https://doi.org/10.1007/BF01029572 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01029572 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mecikalski J. Department of Geosciences, The University of Wisconsin-Milwaukee, P.O. Box 413, 53201, Milwaukee, WI, USA aut NATIONALLICENCE 700 1- Tilley J. Department of Geosciences, The University of Wisconsin-Milwaukee, P.O. Box 413, 53201, Milwaukee, WI, USA aut NATIONALLICENCE 773 0- Meteorology and Atmospheric Physics Springer-Verlag 48/1-4(1992-03-01), 249-271 0177-7971 48:1-4<249 1992 48 703 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer