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HURRICANE STRUCTURE

HURRICANE STRUCTURE. Dr. Richard M. Yablonsky University of Rhode Island/GSO Hurricane Webinar Series 2012 28 February 2012, 7:00pm EST. WHAT IS THIS???. < 1 mile. Image courtesy of http://www.andovernet.com/. WHAT IS THIS???. < 1 mile. Image courtesy of http://www.andovernet.com/.

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HURRICANE STRUCTURE

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  1. HURRICANE STRUCTURE Dr. Richard M. Yablonsky University of Rhode Island/GSO Hurricane Webinar Series 2012 28 February 2012, 7:00pm EST

  2. WHAT IS THIS??? < 1 mile Image courtesy of http://www.andovernet.com/

  3. WHAT IS THIS??? < 1 mile Image courtesy of http://www.andovernet.com/ • The Andover, KS TORNADO of April 26, 1991 (Wind ≈ 250 mph) • This is NOT a hurricane!!! This is NOT a hurricane!!!

  4. WHAT IS THIS??? ~ 10 miles < 1 mile ~ 10 miles Image courtesy of http://www.chaseday.com/

  5. WHAT IS THIS??? • A thunderstorm near • Ardmore, OK • This is NOT a hurricane! • This is NOT a hurricane! • This is NOT a hurricane! ~ 10 miles < 1 mile ~ 10 miles Image courtesy of http://www.chaseday.com/

  6. OK Rich… so you have lectured us on what a hurricane IS NOT.Please stop teasing and tell us what a hurricane IS!

  7. Definitions from United States National Hurricane Center • Hurricane: “A tropical cyclone in which the maximum sustained surface wind is 74 mph or more” (NHC). OK, but what is a tropical cyclone?

  8. Definitions from United States National Hurricane Center • Hurricane: “A tropical cyclone in which the maximum sustained surface wind is 74 mph or more” (NHC). OK, but what is a tropical cyclone? • Tropical cyclone:“A warm-core, non-frontal, synoptic-scale cyclone, originating over tropical or subtropical waters, with organized deep convection and a closed surface wind circulation about a well-defined center” (NHC).WHAT??? 

  9. Hurricane Ivan on September 9, 2004 ~ 250 miles Image courtesy of NOAA

  10. Hurricane Ivan on September 9, 2004 A thunderstorm in one of Ivan’s spiral bands ~ 250 miles Image courtesy of NOAA

  11. Hurricane Ivan on September 9, 2004 A thunderstorm in one of Ivan’s spiral bands Eye (No Wind) ~ 250 miles Image courtesy of NOAA

  12. Hurricane Ivan on September 9, 2004 A thunderstorm in one of Ivan’s spiral bands Eye (No Wind) Eyewall: Region of strongest winds ~ 250 miles Image courtesy of NOAA

  13. 100 mi What about SIZE? SIZE ≠ INTENSITY! Courtesy of Brian Kabat US Air Force Academy

  14. 100 mi 200 mi What about SIZE? SIZE ≠ INTENSITY! Courtesy of Brian Kabat US Air Force Academy

  15. 100 mi 09/13/04 1200Z 09L IVAN 09/13/04 1315Z GOES - 12 VIS 200 mi 250 mi What about SIZE? SIZE ≠ INTENSITY! Courtesy of Brian Kabat US Air Force Academy

  16. SIZE ≠ INTENSITY! 150 mph (Category 4) 140 mph (Category 4) 100 mi 09/13/04 1200Z 09L IVAN 09/13/04 1315Z GOES - 12 VIS 200 mi 250 mi 160 mph (Category 5) What about SIZE? Courtesy of Brian Kabat US Air Force Academy

  17. Largest & Smallest Tropical Cyclones

  18. What about eyes? Here is Wilma…

  19. And here is Isabel!

  20. Vertical slice through a hurricane

  21. Wind speed distribution

  22. Hurricane’s Secondary Circulation

  23. Convection in the Atmosphere COLD COOL Image courtesy of http://home.comcast.net/~j2jensen/ WARM

  24. HOT Convection in the Atmosphere COLD COOL Image courtesy of http://home.comcast.net/~j2jensen/ WARM

  25. COLD Image courtesy of http://www.photohome.com/ WARM HOT Convection in the Atmosphere COLD The hot air parcel rises… just like in a hot air balloon! COOL Image courtesy of http://home.comcast.net/~j2jensen/ WARM

  26. Hurricanes are fueled by the ocean URI team focus: Understanding & modeling hurricane-ocean interaction

  27. Tropical vs. Extratropical Cyclones

  28. Extratropical Transition

  29. Definitions from United States National Hurricane Center • Hurricane: “A tropical cyclone in which the maximum sustained surface wind is 74 mph or more” (NHC). Rich, you said that already! • Tropical cyclone:“A warm-core, non-frontal, synoptic-scale cyclone, originating over tropical or subtropical waters, with organized deep convection and a closed surface wind circulation about a well-defined center” (NHC).I think I get it now! 

  30. Hurricanes: Science and Society Learn more at: www.hurricanescience.org

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