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Las Vegas Event 8 July 1999

Las Vegas Event 8 July 1999. Jennifer H. Maxwell. Las Vegas Flash Floods. Strong thunderstorms in the Las Vegas valley occurred between 18z and 19z. More than 2 inches of rain fell in less than 1 hour resulting in damaging flash floods (rainfall rates were likely over 4 in/hr).

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Las Vegas Event 8 July 1999

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  1. Las Vegas Event 8 July 1999 Jennifer H. Maxwell

  2. Las Vegas Flash Floods • Strong thunderstorms in the Las Vegas valley occurred between 18z and 19z. • More than 2 inches of rain fell in less than 1 hour resulting in damaging flash floods (rainfall rates were likely over 4 in/hr). • Higher amounts likely over higher terrain to the NE and NW of the valley.

  3. 1145Z 08 July 1999

  4. 1145Z 08 July 1999

  5. 6-h forecast valid at 18Z ETA

  6. 1200 UTC 8 July 1999 surface analysis

  7.  Desert Rock PW=1.68” Yuma PW= 2.01” 

  8. 700 mb – green, 500 mb- red

  9. 14Z 8 July 1999

  10. 1hr radar accum 1902z

  11. Conclusions • Tropical connection • High surface dewpoints • Location of upper level high and inverted 500 mb trof • Orographics • Urbanization • Possible effects from earlier convection NE of Las Vegas?

  12. Results • Low centroid storms • Over 2 inches of rain in less than 1 hr • More rapid runoff (urban area)

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