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The MCC, an overview and case study on it's impact in the western United States
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Filetype[PDF-3.64 MB]

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  • Corporate Authors:
    United States, National Weather Service., Western Region,
  • Description:
    "Severe weather- as defined by tornadoes, large hail and strong thunderstorm winds - is more uncommon in the Western Region than it is in the other National Weather Service regions. While thunderstorms do occur throughout much of the region from time to time, they are generally less intense in nature than many of those that occur over the central United States. This has recently been demonstrated by Schaefer, et al. (1985) using tornado statistics which show that the areal frequency of all tornadoes drops, in general, from one to three orders of magnitude from the central U.S. to the western U.S. The biggest difference in the tornado statistics, however, is in the magnitude of the storm (i.e.- it's width and path length). The areal frequency of severe weather over the West drops off sharply when only the "intense" storms are included; this dropoff is less dramatic over the central states. This suggests that not only are there more tornadic storms over the central U.S., but that they are also more intense"--Page 1.

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