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Numerical Simulation of the 9-10 June 1972 Black Hills Storm Using CSU RAMS
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External Online Source: doi:10.1175/1520-0493(1997)125<1753:NSOTJB>2.0.CO;2
Author and Affiliation:
Nair, U. S.(South Dakota School of Mines and Technology, Inst. of Atmospheric Sciences, Rapid City, SD United States);
Hjelmfelt, Mark R.(South Dakota School of Mines and Technology, Inst. of Atmospheric Sciences, Rapid City, SD United States);
Pielke, Roger A., Sr.(Colorado State Univ., Dept. of Atmospheric Science, Fort Collins, CO United States)
Abstract: Strong easterly flow of low-level moist air over the eastern slopes of the Black Hills on 9-10 June 1972 generated a storm system that produced a flash flood, devastating the area. Based on observations from this storm event, and also from the similar Big Thompson 1976 storm event, conceptual models have been developed to explain the unusually high precipitation efficiency. In this study, the Black Hills storm is simulated using the Colorado State University Regional Atmospheric Modeling System. Simulations with homogeneous and inhomogeneous initializations and different grid structures are presented. The conceptual models of storm structure proposed by previous studies are examined in light of the present simulations. Both homogeneous and inhomogeneous initialization results capture the intense nature of the storm, but the inhomogeneous simulation produced a precipitation pattern closer to the observed pattern. The simulations point to stationary tilted updrafts, with precipitation falling out to the rear as the preferred storm structure. Experiments with different grid structures point to the importance of removing the lateral boundaries far from the region of activity. Overall, simulation performance in capturing the observed behavior of the storm system was enhanced by use of inhomogeneous initialization.
Publication Date: Aug 01, 1997
Document ID:
19980018995
(Acquired Apr 04, 1998)
Subject Category: METEOROLOGY AND CLIMATOLOGY
Report/Patent Number: NASA/CR-97-207278, NAS 1.26:207278
Document Type: Technical Report
Publication Information: Weather Monthly; Volume 125; 1753-1766
Publisher Information: American Meterological Society, United States
Contract/Grant/Task Num: NAG1-542; NSF ATM-91-23360; NSF OSR-94-52894; NSF ATM-93-06754
Financial Sponsor: NASA Langley Research Center; Hampton, VA United States
National Science Foundation; Washington, DC United States
South Dakota School of Mines and Technology; Inst. of Atmospheric Sciences; Rapid City, SD United States
Organization Source: South Dakota School of Mines and Technology; Inst. of Atmospheric Sciences; Rapid City, SD United States
Description: 14p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: ATMOSPHERIC MODELS; BLACK HILLS (SD-WY); COMPUTERIZED SIMULATION; FLOODS; INHOMOGENEITY; PRECIPITATION (METEOROLOGY); STORMS; VERTICAL AIR CURRENTS
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