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oai:www.ideals.illinois.edu:2142/67804 2023-07-11 col_2142_5131 col_2142_14839 com_2142_5130 com_2142_14838 com_2142_13459 com_2142_8903

Chen, Ching-Sen 2014-12-14T06:31:19Z 2014-12-14T06:31:19Z 10000-01-01 1980 1980 The importance of gust fronts in triggering new storm development is widely recognized. A three-dimensional numerical cloud model developed by Klemp and Wilhelmson is used to study the relationship of new convection to previously generated gust fronts. The model has been modified with a vertically stretched grid, a fourth-order conservative approximation for horizontal advection, and an Orlanski type boundary condition. The sounding taken from the multicell Raymer storm that occurred in NHRE on 9 July 1973 is used as the initial environment in the model. Five new cells form about 25-30 min apart due to the downdraft from the previous cell enhancing the convergence along the gust front. A comparison with observation data shows qualitative agreement. Comparison of results with those obtained by other modelers for different storms is also included. The formation of successive cells is apparently very sensitive to the amount of heat initially used to generate convection, but is not very sensitive to the type of heat source used to initialize convection. When the initial observed wind is altered by using only its north-south component successive cells still occur. The successive formation of new cells is not sensitive to the type of lateral boundary conditions used for calculating normal velocity. Other sensitivity tests are also reported. Made available in DSpace on 2014-12-14T06:31:19Z (GMT). No. of bitstreams: 1 8026462.pdf: 5490492 bytes, checksum: ee03ce818caf6c52fc4d0ede5f2a8f04 (MD5) Previous issue date: 1980 Embargo set by: Seth Robbins for item 67982 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 197 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1980. http://hdl.handle.net/2142/67804 (UMI)AAI8026462 eng Physics, Atmospheric Science The Effect of The Gust Front on The Generation of New Convection text Atmospheric Sciences Atmospheric Sciences University of Illinois at Urbana-Champaign Dissertation Ph.D.