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Coastal Gravity Wave Event of 24 April 2010 National Weather Association Annual National Conference, Tucson, AZ 2-7 October 2010 Scott Overpeck, Chris.

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Presentation on theme: "Coastal Gravity Wave Event of 24 April 2010 National Weather Association Annual National Conference, Tucson, AZ 2-7 October 2010 Scott Overpeck, Chris."— Presentation transcript:

1 Coastal Gravity Wave Event of 24 April 2010 National Weather Association Annual National Conference, Tucson, AZ 2-7 October 2010 Scott Overpeck, Chris McKinney, and Kent Prochazka NOAA/National Weather Service Houston/Galveston, TX

2 Overview 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.

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

4 Synoptic Environment – 24 April 2010

5

6

7 IR Satellite Image – 0315 UTC, 24 April 2010

8 IR Satellite Image – 0631 UTC, 24 April 2010

9 IR Satellite Image – 0915 UTC, 24 April 2010

10 Water Vapor Satellite Image – 0345 UTC, 24 April 2010

11 Water Vapor Satellite Image – 0631 UTC, 24 April 2010

12 Water Vapor Satellite Image – 0915 UTC, 24 April 2010

13 Radar Image – 0525 UTC, 24 April 2010

14 Pressure and Wind Observation

15

16 Radar Image – 0609 UTC, 24 April 2010

17 Radar Image – 0652 UTC, 24 April 2010

18 Pressure and Wind Observation

19 Radar Image – 0723 UTC, 24 April 2010

20 Pressure and Wind Observation

21 Radar Image – 0812 UTC, 24 April 2010

22 Pressure and Wind Observation

23 Gravity Wave Summary Site Period (hours) Pressure Change (MB) Minimum Pressure (MB) Maximum Sustained Wind (KNOTS) Peak Wind Gust (KNOTS) Angleton (KLBX)32.4998.32026 Freeport (USCG 8772447)3.35.9996.13543 Scholes Field (KGLS)3.257.1995.14560 Pleasure Pier (GPST2, 8771510)3.26.7994.53643 Sabine Pass North (SBPT2, 8770570)2.77996.63242 Average3.16.7995.63747 Gravity Wave Characteristics Freeport to KGLS KGLS to Sabine Pass Freeport to Sabine Pass Average Period (Hours)3.2752.9753 Wave Velocity (Knots)655255 Wavelength (Nautical Miles)213155165  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).

24 Questions? Comments? Coastal Gravity Wave Event of 24 April 2010 National Weather Association Annual National Conference, Tucson, AZ 2-7 October 2010 Scott Overpeck, Chris McKinney, and Kent Prochazka NOAA/National Weather Service Houston/Galveston, TX E-mail: scott.overpeck@noaa.gov

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