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Coastal Gravity Wave Event of 24 April 2010 - Study and Analysis

Documenting mesoscale gravity waves along the Upper Texas Coast on 24 April 2010, presenting synoptic environment, satellite imagery, radar data, pressure, wind observations, and event summary.

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Coastal Gravity Wave Event of 24 April 2010 - Study and Analysis

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  1. Coastal Gravity Wave Event of 24 April 2010National Weather Association Annual National Conference, Tucson, AZ2-7 October 2010Scott Overpeck, Chris McKinney, and Kent ProchazkaNOAA/National Weather Service Houston/Galveston, TX

  2. The goal of this study is to document the passing of mesoscale gravity waves that propagated along the Upper Texas Coast during the early morning hours of 24 April 2010. Pressure changes of 5-7 hPa were observed with the passing of the waves, and high winds of 60 knots caused damage to house roofs and snapped power poles. • Synoptic Environment for Gravity Waves. • Possible source region of the Gravity Waves on April 24. • IR and Water Vapor Satellite Imagery, Radar reflectivity and base velocity showing the Gravity Wave passage. • Corresponding pressure and wind data from 5 observation sites along the Upper Texas Coast. • Summary of the event. Overview

  3. Synoptic Environment – Koch and O’Handley (1997)

  4. Synoptic Environment – 24 April 2010

  5. Synoptic Environment – 24 April 2010

  6. IR Satellite Image – 0315 UTC, 24 April 2010

  7. IR Satellite Image – 0631 UTC, 24 April 2010

  8. IR Satellite Image – 0915 UTC, 24 April 2010

  9. Water Vapor Satellite Image – 0345 UTC, 24 April 2010

  10. Water Vapor Satellite Image – 0631 UTC, 24 April 2010

  11. Water Vapor Satellite Image – 0915 UTC, 24 April 2010

  12. Radar Image – 0525 UTC, 24 April 2010

  13. Pressure and Wind Observation

  14. Pressure and Wind Observation

  15. Radar Image – 0609 UTC, 24 April 2010

  16. Radar Image – 0652 UTC, 24 April 2010

  17. Pressure and Wind Observation

  18. Radar Image – 0723 UTC, 24 April 2010

  19. Pressure and Wind Observation

  20. Radar Image – 0812 UTC, 24 April 2010

  21. Pressure and Wind Observation

  22. Gravity Wave Summary • The gravity wave most likely had a period of about 3 hours, a wavelength between 155-215 NM, and a velocity of 52-65 knots. • The average pressure change was 6.7 hPa with a minimum pressure of 995.6 hPa and wind speeds of 37 knots (gusts of 47 knots).

  23. Questions? Comments?Coastal Gravity Wave Event of 24 April 2010National Weather Association Annual National Conference, Tucson, AZ2-7 October 2010Scott Overpeck, Chris McKinney, and Kent ProchazkaNOAA/National Weather Service Houston/Galveston, TXE-mail: scott.overpeck@noaa.gov

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