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    Summer Weather Simulation for the Semiarid Lower Colorado River Basin: Case Tests

    Source: Monthly Weather Review:;2003:;volume( 131 ):;issue: 003::page 521
    Author:
    Li, J.
    ,
    Gao, X.
    ,
    Maddox, R. A.
    ,
    Sorooshian, S.
    ,
    Hsu, K.
    DOI: 10.1175/1520-0493(2003)131<0521:SWSFTS>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Accurate summertime weather forecasts, particularly the quantitative precipitation forecast (QPF), over the semiarid southwest United States pose a difficult challenge for numerical models. Two case studies, one with typical weather on 6 July 1999 and another with unusual flooding on 8 July 1999, using the Regional Atmospheric Modeling System (RAMS) nested inside the regional Eta Model, were conducted to test numerical weather prediction capabilities over the lower Colorado River basin. The results indicate that the rapid changes in synoptic patterns during these two cases strongly affect the weather and rainfall situation in the basin. The model illustrates that the midlevel sinking over the low elevation of the southwest area of the basin ?capped? the development of deep convection in case 1; meanwhile, in case 2, a shear line and convergence over the Las Vegas area valley stimulated intense convective storms in the region. In both cases, the low-level jet (LLJ) stream from the Gulf of California was the major source of atmospheric moisture for the basin. Local topography and thermodynamics also play a significant role in the formation of the weather features. The ?thermal low? over the Sonoran Desert is responsible for the LLJ stream, which led to the valley of the Colorado River becoming the warmest and moistest area in the basin. By nesting fine-resolution grids over the Las Vegas area, the representation of local topography in the region was improved in the RAMS model, compared with that in the relatively coarse resolution Eta Model. This appears to be the major reason that the RAMS model could predict intense convective storms over Las Vegas, while the operational Eta forecast could not.
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      Summer Weather Simulation for the Semiarid Lower Colorado River Basin: Case Tests

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4205157
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    • Monthly Weather Review

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    contributor authorLi, J.
    contributor authorGao, X.
    contributor authorMaddox, R. A.
    contributor authorSorooshian, S.
    contributor authorHsu, K.
    date accessioned2017-06-09T16:14:49Z
    date available2017-06-09T16:14:49Z
    date copyright2003/03/01
    date issued2003
    identifier issn0027-0644
    identifier otherams-64082.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4205157
    description abstractAccurate summertime weather forecasts, particularly the quantitative precipitation forecast (QPF), over the semiarid southwest United States pose a difficult challenge for numerical models. Two case studies, one with typical weather on 6 July 1999 and another with unusual flooding on 8 July 1999, using the Regional Atmospheric Modeling System (RAMS) nested inside the regional Eta Model, were conducted to test numerical weather prediction capabilities over the lower Colorado River basin. The results indicate that the rapid changes in synoptic patterns during these two cases strongly affect the weather and rainfall situation in the basin. The model illustrates that the midlevel sinking over the low elevation of the southwest area of the basin ?capped? the development of deep convection in case 1; meanwhile, in case 2, a shear line and convergence over the Las Vegas area valley stimulated intense convective storms in the region. In both cases, the low-level jet (LLJ) stream from the Gulf of California was the major source of atmospheric moisture for the basin. Local topography and thermodynamics also play a significant role in the formation of the weather features. The ?thermal low? over the Sonoran Desert is responsible for the LLJ stream, which led to the valley of the Colorado River becoming the warmest and moistest area in the basin. By nesting fine-resolution grids over the Las Vegas area, the representation of local topography in the region was improved in the RAMS model, compared with that in the relatively coarse resolution Eta Model. This appears to be the major reason that the RAMS model could predict intense convective storms over Las Vegas, while the operational Eta forecast could not.
    publisherAmerican Meteorological Society
    titleSummer Weather Simulation for the Semiarid Lower Colorado River Basin: Case Tests
    typeJournal Paper
    journal volume131
    journal issue3
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(2003)131<0521:SWSFTS>2.0.CO;2
    journal fristpage521
    journal lastpage541
    treeMonthly Weather Review:;2003:;volume( 131 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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