The author is grateful to the Center for Meteorology and Physical Oceanography, Massachusetts Institute of Technology, for providing materials and facilities, and to Professor Steven L. Mullen and Michael Leutold, of the Department of Atmospheric Science, The University of Arizona, for arranging and providing the NWS maps and the potential-temperature maps during 1997–98. He is also grateful to Professors Lance F. Bosart and Peter V. Hobbs, and to Dr. Richard Rotunno for comments on the penultimate version of the paper, and to the reviewers of the present version. The effects of these comments were salutary.
Bjerknes, J., 1919: On the structure of moving cyclones. Geof. Publ.,1, 1–9.
——, and H. Solberg, 1921: Meterological conditions for the formation of rain. Geof. Publ.,2, 1–62.
Cohen, R. A., and C. W. Kreitzberg, 1997: Airstream boundaries in numerical weather simulations. Mon. Wea. Rev.,125, 168–183.
Hoskins, B. J., and F. P. Bretherton, 1972: Atmospheric frontogenesismodels: Mathematical formulation and solution. J. Atmos. Sci.,29, 11–37.
Petterssen, S., 1940: Weather Analysis and Forecasting. 1st ed. McGraw-Hill, 503 pp.
——, 1956: Weather Analysis and Forecasting. 2d ed. Vol. 1. McGraw-Hill, 286 pp.
Sanders, F., 1971: Analytic solutions of the quasi-geostrophic omega and vorticity equations for a structurally simple model of distur[bu793]bances in the baroclinic westerlies. Mon. Wea. Rev.,99, 393–407.
——, and C. A. Doswell III, 1995: A case for detailed surface analysis. Bull. Amer. Meteor. Soc.,76, 505–521.
——, L. F. Bosart, and C.-C. Lai, 1991: Initiation and evolution of an intense upper-level front. Mon. Wea. Rev.,119, 2832–2851.
Uccellini, L. W., S. F. Corfidi, N. W. Junker, P. J. Kocin, and D. A. Olson, 1992: Report on the surface analysis workshop at the National Meteorological Center 25–28 March 1991. Bull. Amer. Meteor. Soc.,73, 459–471.