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A Fine-Scale Study of the 16 June 2009 Thunderstorm Event at Deseret Ranch

A Fine-Scale Study of the 16 June 2009 Thunderstorm Event at Deseret Ranch Max Goldfarb and Shannon Ogle Florida Institute of Technology Department of Marine and Environmental Sciences . Objectives:.

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A Fine-Scale Study of the 16 June 2009 Thunderstorm Event at Deseret Ranch

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  1. A Fine-Scale Study of the 16 June 2009 Thunderstorm Event at Deseret Ranch Max Goldfarb and Shannon Ogle Florida Institute of Technology Department of Marine and Environmental Sciences

  2. Objectives: • Compare model radar reflectivity patterns to observed radar images for Melbourne as well as model surface temperature • Analyze fine scale Temperature and Relative Humidity Data for June 16, 2009 at Deseret Ranch • Evaluate model forecasts and radar reflectivity to sensor data • Investigate possible heat burst activity and compare with past studies

  3. Atmospheric phenomena occur on many different spatial scales: from 1000 kilometers to 100 meters.

  4. Introduction

  5. Water Vapor Satellite Image

  6. CAPE

  7. North American Mesoscale Surface Temperature Model

  8. % ᵒF

  9. ᵒF %

  10. Within the downdraft of a storm, circulations on different scales occur as well.

  11. Heat Burst Formation:

  12. Past Studies (Johnson, 1976): • * Temperature increase of 2.6oC • *Soundings indicated warming and drying below 3 km (~700mb) • *Occurred during dissipating stage of thunderstorm and in the evening • Effects of Heat Bursts: • *Sudden increase of temperature with a thunderstorm • *Associated with strong damaging winds • *Sometimes falsely attributed to tornado damage • *Possible danger to crops

  13. 2D Model of a Downdraft

  14. Conclusion: • Fine scale temperature network captured activity not resolvable by a mesoscale model • Because of the sparse distribution of data, heat bursts may occur more often in central Florida. • HOBO sensors can fill in the gaps in observing networks and capture important phenomena

  15. Acknowledgements • Special Thanks to: • Dr. Chiao • Dr. Johnson • Dr. Lazarus • Mr. Splitt • Florida Tech DMES Students

  16. References: • Johnson, B. “The Heat Burst of 29 May 1979”. Journal of Atmospheric Sciences. May 20, 1983 • Michaelsen, Joel. Geology 110: Imtroductory Meteoorlogy lecture notes, Winter 2008. http://www.geog.ucsb.edu/~joel/g110_w08/lecture_notes/Checked 7/20/2009.

  17. Questions? Next: Erin Binder and Clemens Grohs

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