caa a22 4500 469052864 CHVBK 20180323132835.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF01025403 doi (NATIONALLICENCE)springer-10.1007/BF01025403 Three-dimensional simulation of the Denver 11 July 1988 microburst-producing storm [Elektronische Daten] [F. Proctor, R. Bowles] Summary: Near Denver on July 11 1988, a moderate-reflectivity thunderstorm produced a microburst of unusual intensity during the test operation of the Terminal Doppler Weather Radar (TDWR) system. This microburst-producing storm, unlike those previously investigated, contained a complex updraft structure and an intense microburst downstream from the main precipitation shaft. Of special significance is that several successive airliners inadvertently encountered the microburst during final approach to Stapleton Airport. This paper focuses on the numerical investigation of this storm-via simulation with the Terminal Area Simulation System (TASS). Evolution and structure of the storm, including hazard indices based onF-factor, are presented and compared with "observed” data, including that measured by Doppler radar and aircraft flight data recorders. Model results show that multiple low-to moderate-reflectivity microbursts formed downshear of the main precipitation shaft. The most intense of the modeled microbursts contained a velocity differential exceeding 40m/s, strong downdrafts, and hazardous windshear withF-factors approaching 0.2. Outflow from this microburst was roughly symmetric at ground level during peak intensity, but became more asymmetric with time and altitude above the ground. The intense microburst, not unlike the real microburst that was encountered by the aircraft, originated from light precipitation that was swept downwind of the primary source. In contrast to the intense microburst, downdrafts and outflows associated with the simulated storm's main precipitation shaft were less vigorous by comparison, even though accompanied by higher magnitudes of radar reflectivity. Additional simulations with the axisymmetric version of TASS configured from the 3-D simulation, suggest that the intense microburst was driven by cooling primarily from sublimating snow. Springer-Verlag, 1992 Proctor F. Flight Management Division, NASA Langley Research Center, 23681, Hampton, Virginia, USA aut Bowles R. Wind Shear Program Office, NASA Langley Research Center, 23681, Hampton, Virginia, USA aut Meteorology and Atmospheric Physics Springer-Verlag 49/1-4(1992-03-01), 107-124 0177-7971 49:1-4<107 1992 49 703 https://doi.org/10.1007/BF01025403 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01025403 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Proctor F. Flight Management Division, NASA Langley Research Center, 23681, Hampton, Virginia, USA aut NATIONALLICENCE 700 1- Bowles R. Wind Shear Program Office, NASA Langley Research Center, 23681, Hampton, Virginia, USA aut NATIONALLICENCE 773 0- Meteorology and Atmospheric Physics Springer-Verlag 49/1-4(1992-03-01), 107-124 0177-7971 49:1-4<107 1992 49 703 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer