Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt........35r&link_type=abstract
Thesis (PhD). NORTH CAROLINA STATE UNIVERSITY, Source DAI-B 58/06, p. 3097, Dec 1997, 360 pages.
Computer Science
Scientific paper
Numerical modeling studies of the 28-29 March 1984 explosive cyclogenesis case revealed that key features within the antecedent environment can be traced back into Texas 33 hours before the event. Experiments showed that unseasonable lower-tropospheric warming, facilitated by minimal soil moisture, strong surface sensible heating, and down slope flow off the Mexican Plateau, forced the development of a deep Planetary Boundary Layer (PBL) and a reduction of surface pressures over southern Texas. The hydrostatic response to the heating forced a mid-level thickness perturbation and an intensification of the mid- tropospheric pressure gradient force. Large divergence tendencies within the mid-level flow initiated differential vertical motions, folding of the isentropes, and the formation of a Mid-tropospheric Unbalanced Front (MUF). Coincident with the development in southern Texas, the PBL over the Edwards Plateau deepened to near the 550 mb level. Vertical fluxes of horizontal momentum led to the formation of a lower-tropospheric mesoridge, which resulted in parcel divergence and an acceleration towards the lower surface pressure over southern Texas. The accompanying cold air advection induced an intensification of the mid-level pressure gradient force and a rapid turning of the winds off the Mexican Plateau. The proximity of hot air over elevated Plateau region facilitated frontogenesis by cross-stream confluence deformation. This incipient jet/front system propagated eastward across Texas where it encountered a strong SE to NW directed pressure gradient force. The advancement of the Polar Front at low-levels enhanced the mid- tropospheric pressure gradient force over the Arklatex and accelerated the jet northeastwards into Mississippi by 1200 UTC 28 March. Mid-tropospheric jet/front system began to decay after 1200 UTC 28 March. The thermally direct circulation about the weakening frontal system sagged southeastwards and phased with a thermodynamically indirect circulation surrounding the large-scale system. This merger of large- scale and subsynoptic scale systems provides a focusing mechanism for the initiation of a squall line. Vertical wind shear, surface sensible heating and weak static stability provide an environment conducive to explosive cyclogenesis.
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