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Precipitation Shadows in the Hudson Valley Hudson Valley Ambient Meteorology Study (HVAMS)

Precipitation Shadows in the Hudson Valley Hudson Valley Ambient Meteorology Study (HVAMS). National Science Foundation, Physical Meteorology Section David R. Fitzjarrald, Atmospheric Sciences Research Center, UAlbany, SUNY Jeffrey M. Freedman, Atmospheric Information Services and

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Precipitation Shadows in the Hudson Valley Hudson Valley Ambient Meteorology Study (HVAMS)

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  1. Precipitation Shadows in the Hudson ValleyHudson Valley Ambient Meteorology Study(HVAMS) • National Science Foundation, Physical Meteorology Section • David R. Fitzjarrald, Atmospheric Sciences Research Center, UAlbany, SUNY • Jeffrey M. Freedman, Atmospheric Information Services • and • Ricardo K. Sakai1, Matt Czikowsky1, Alex Tsoyref1, and Jessica Neiles2 • 1. ASRC • 2. NWS, Wilmington, NC Thomas Cole: River in the Catskills (1830s)

  2. Northeast Escarpment The Hudson Valley Catskills ALB Hudson Valley Kingston 100 km HPN NYC Source: http://visibleearth.nasa.gov/U_S__States/New_York/32_6.html

  3. Hudson Valley Ambient Meteorology Study • Opportunistic events: heavy rains and rain shadows during IFC

  4. P: ISFF H: HOBOs KENX KEY: Dense network of stations 20 km

  5. South Albany (P8) through Freehold (H2), East Jewett (H2) to Phoenicia Phoenicia East Jewett (H3) So. Albany P8 Freehold (H2) Catskills

  6. History

  7. Three Cases • 23 September 2003 • 26 - 27 October 2003 • 29 October 2003 Briefly examine the first two…

  8. Short event (most precipitation in 2 - 4 hr period) Heaviest rainfall over southern Catskills (70+ mm) Distinct precipitation shadow to north-northeast (< 20 mm) 23 September 2003

  9. 1200 UT 23 September 2003

  10. 1200 UT 23 September 2003

  11. 1200 UT 23 September 2003

  12. KENX Storm Total Precipitation Escarpment

  13. Steady rain for 24+ hours Heaviest rainfall over central Catskills (90+ mm) Again, distinct precipitation shadow to north-northeast (< 30 mm) 26 - 27 October 2003

  14. 1200 UT 27 October 2003

  15. Comparatively modest terrain, but… Brady and Waldstreicher (2001) Poconos of NE PA Conditions favoring mountain waves: Decreasing static stability with height Stable layer near mountain top level Decrease of cross barrier flow with height. Mountain Waves?

  16. KENX VAD Profile 1052 - 1146 UT 23 Sep 2003

  17. KENX VAD Profile 1227 - 1320 UT 27 Oct 2003

  18. Eta Model Sounding0600 UT 23 September 2003 From ASRC Air Quality Forecasting Modeling System

  19. Conclusions(?) • Distinct precipitation shadows downwind of Catskill Escarpment • Hint of mountain waves (ducted gravity waves?) • Need further study: incorporate data from other networks (NYCDEP); stability parameters from model soundings

  20. Acknowledgments • University at Albany participation:ASRC: Scientists David Fitzjarrald, Ricardo Sakai (Ph. D. ‘00)Technician Alex Tsoyref Graduate Student: Matt Czikowsky (M. Sc. ‘03) Project Assistant: Jessica Neiles (B. Sc. ‘03) Undergraduate students: Jason Herb Kim Sutkevich Aaron Feinberg • Atmospheric Information Services: • Co-Investigator: Jeff Freedman, (Ph. D. ‘00)

  21. Acknowledgments • Brazilian collaborators from the U. of Santa Maria, RS: Osvaldo Moraes (postdoctoral visitor ‘90) Otávio Acevedo (Ph. D. ‘01) Rodrigo da Silva (visiting grad. Student ‘02,’03)

  22. Acknowledgments Facilities made available through the Deployment Pool funds of The NSF: • Wyoming King Air instrumented aircraft • 9 ISSF automatic weather stations from the National Center for Atmospheric Science (NCAR), Boulder CO • TAOS tethered balloon sounder (NCAR) Facility available through collaboration with the University of Alabama, Huntsville: MIPS • Collaboration with NOAA/NWS Radar wind profiler at Schenectady airport Additional balloon soundings at the National Weather Service Forecast Office, Albany.

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