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The Northeast Convective Flash Flood Project: July 29 th 2009 Flash Flood Case Study

The Northeast Convective Flash Flood Project: July 29 th 2009 Flash Flood Case Study. Derek V. Mallia University at Albany Department of Atmospheric and Environmental Sciences Synoptic Meteorology Presentation. Outline:. Synopsis of case Overview of Synoptic/ Mesoscale Features

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The Northeast Convective Flash Flood Project: July 29 th 2009 Flash Flood Case Study

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  1. The Northeast Convective Flash Flood Project: July 29th 2009 Flash Flood Case Study Derek V. Mallia University at Albany Department of Atmospheric and Environmental Sciences Synoptic Meteorology Presentation

  2. Outline: • Synopsis of case • Overview of Synoptic/Mesoscale Features • Analysis of indices • Conclusion

  3. Data Sources Used: • Advanced Weather Information Processing System (AWIPS) • Weather Event Simulator (WES) • Rapid Update Cycle (RUC40) (RUC80) • Albany Radar (KENX) • Geostationary Operational Environmental Satellite (GOES)

  4. Synopsis of July 29 2009 Flash Flood Event • Widespread flash flood event • Occurred in: • Saratoga County • Greene County • Rensselaer County • Columbia County • Berkshire County • One day event • Occurred between 17-01 UTC • Frontal case • Associated with cold front over Ontario Lake

  5. Pictures from July 29th Event Courtesy of Brian Frugis and Tim Scrom

  6. Courtesy of Stefan Bagnato

  7. WV Satellite and 500 hPa RUC 80 Height Loop

  8. RUC 80 500hPa Height Analysis 16 UTC

  9. RUC 40 500hPa Height and Relative Vorticity 16 UTC 20 UTC Upstream Vorticity Maximums Upstream Vorticity Maximums

  10. RUC 40 250hPa Wind Analysis 16 UTC

  11. RUC 40 250hPa Wind Analysis 20 UTC

  12. RUC 40 250hPa Wind Analysis 00 UTC

  13. RUC 40 250hPa Wind Divergence Analysis 16 UTC

  14. RUC 40 250hPa Wind Divergence Analysis 20 UTC

  15. RUC 40 PWAT & 850 hPa Wind and Theta-E Advection 16 UTC 16 UTC

  16. RUC 40 PWAT & 850 hPa Wind and Theta-E Advection 20 UTC

  17. RUC 40 PWAT & 850 hPa Wind and Theta-E Advection 00 UTC

  18. KENX Radar Image Loops 16:27-22:24 UTC

  19. KENX Radar Image Loops 22:24-00 UTC

  20. Surface Analysis 18 UTC

  21. Surface Analysis 20 UTC

  22. Sounding Derived Parameters • CAPE= 2614J/kg“tall and moderate CAPE” • K-Index= 32 • Total Totals= 47 • PWAT= 1.86 in. • Freezing level= 13.9k ft • Dew point= lower 70s F • Max low level wind= 30 kts; southwest

  23. Conclusions: • Dual vorticity and right entrance region of jet provided favorable upper air dynamics • Baroclinic boundary provided focus for precipitation due to isentropic lift. • Plenty of moisture transport into region • High CAPE and moderate K-Index value suggest plenty of instability • Possible topographic effects?

  24. Acknowledgements • Joe Villani; Albany National Weather Service • Neil Stuart; Albany National Weather Service • Julie Gabriel; University of Delaware • Allen Srock; University at Albany • Nick Metz; University at Albany • And the rest of the NWS staff!

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