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SYNOPTIC METEOROLOGY LABORATORY

SYNOPTIC METEOROLOGY LABORATORY. The Dallas and Fort Worth Storms of May 5, 1995. BY: Brent Crisp, Phil Grigsby, Thomas Jones, Devon Lucie, Tim Love, Andrew Reader, and Matt Sattler. Presentation Outline. Synoptic Overview - Satellite imagery - Upper air maps - Soundings

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SYNOPTIC METEOROLOGY LABORATORY

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  1. SYNOPTIC METEOROLOGY LABORATORY The Dallas and Fort Worth Storms of May 5, 1995 BY: Brent Crisp, Phil Grigsby, Thomas Jones, Devon Lucie, Tim Love, Andrew Reader, and Matt Sattler

  2. Presentation Outline Synoptic Overview - Satellite imagery - Upper air maps - Soundings - Composite Map Radar Summary - Reflectivity Products and cross sections - Velocity Products and cross sections - VIL Products - Hail Trends - Total Precip. Products Mesoscale Summary - Surface analysis - 850 mb features - Shear analysis - Radar products - Storm Wrap-up

  3. Synoptic Overview of the Dallas and Fort Worth Storms of May 5, 1995

  4. Dallas/Ft Worth Area Water Vapor Loop: May 5 1815Z to May 6 0615Z

  5. Visible Satellite Loop: May 5 1815Z to May 5 2302Z

  6. 250 mb Heights and Observations

  7. • Diffluent Flow Over the Southern Plains 250 mb Heights and Observations

  8. 500 mb Heights and Observations

  9. 500 mb Shortwave 500 mb Heights and Observations

  10. Weak Vort Max 12 s^-1 500 mb Vorticity Contours

  11. 850 mb Heights and Observations

  12. Strong Flow from the Gulf, Bringing in Moisture at 850mb 850 mb Heights and Observations

  13. 10°-16°C Dew Points at 850mb 850 mb Dew point Temperatures

  14. L 5:00 p.m. Surface Analysis

  15. 12Z May 5 00Z May 6 Soundings from DFW

  16. Lifted Indices at 00Z May 6

  17. Precipitable Water at 00Z May 6

  18. • 250 mb diffluent flow Composite Map

  19. • 250 mb diffluent flow • 500 mb shortwave Composite Map

  20. • 250 mb diffluent flow • 500 mb shortwave • 850 mb dew point temperatures 10° - 16° C Composite Map

  21. • 250 mb diffluent flow • 500 mb shortwave • 850 mb dew point temperatures • low-level jet Composite Map

  22. • 250 mb diffluent flow • 500 mb shortwave • 850 mb dew point temperatures • low-level jet • stationary front Composite Map

  23. • 250 mb diffluent flow • 500 mb shortwave • 850 mb dew point temperatures • low-level jet • stationary front • precipitable water values from 1.5-2.0 inches Composite Map

  24. Radar Summary of the Dallas and Fort Worth Storms of May 5, 1995

  25. Parker Co. Tarrant Co. Dallas Co. Base Reflectivity Loop from 6:04 p.m. to 8:59 p.m.

  26. Base Velocity Loop from 6:04 p.m. to 8:59 p.m.

  27. • 6:00 p.m DFW RADAR • Supercell located in SW Parker County • Squall line extends from Young to Eastern County • Reflectivity max at 60 dBz’s

  28. • 6:00 p.m. DFW radar • South to North cross section • Bounded Weak Echo Region • Hail Core • Reflectivity max at 60 dBz’s Base Reflectivity Cross Section

  29. • Max VIL 70-75 Kg/m^2 Location of Supercell 6:00 p.m. VIL Product from DFW

  30. • 6:45 p.m. DFW radar • Supercell located in SE Parker County about to enter FTW metro • Squall line beginning to bow west of the supercell • Max Reflectivity of 75 dBz’s

  31. • 6:45 p.m. DFW radar • South to North cross section • More pronounced Bounded Weak Echo Region • Hail Core • Reflectivity max at 75 dBz’s Base Reflectivity Cross Section

  32. • Max VIL 60-65 Kg/m^2 6:45 p.m. VIL Product from DFW

  33. strong meso • 6:45 p.m. DFW radar • Base Velocity product • Strongest meso WNW of radar site

  34. • 6:45 p.m. DFW radar • West to East cross section • Meso evident within the Super- cell • Isentropic lift Base Velocity Cross Section

  35. • Hail and severe hail probabilities at 100 % • Max hail size constant at 3+ inches • Slightly decreasing VIL values 6:00 p.m. - 6:45 p.m. Hail Trends

  36. • 7:30 p.m. DFW radar • Supercell located in Tarrant County • Time of largest hail falling • Supercell is caught by the squall line • Max Reflectivity of 67 dBz’s

  37. • 7:45 p.m. DFW radar • South to North cross section • Hail Core lessening • Lower dBz’s aloft • Reflectivity max at 67 dBz’s Base Reflectivity Cross Section

  38. • Max VIL 45-50 Kg/m^2 7:30 p.m. VIL Product from DFW

  39. • Hail and severe hail probabilities rapidly decrease after 7:20 p.m. • Max hail size from 3+ inches to less than an inch. • Decreasing VIL values 6:30 p.m. - 7:30 p.m. Hail Trends

  40. • 8:00 p.m. DFW radar • Heavy precip threat beginning • Supercell is consumed by the squall line • Large area of reflectivity greater than 50 dBz

  41. • 8:00 p.m. DFW radar • West to East cross section • Strong uplifting within the squall- line. Base Velocity Cross Section

  42. Approx. 3 inches of rain in one hour One Hour Precip from 8:00 to 9:00 p.m.

  43. One Hour Precip Loop from 8:04 to 8:50 p.m.

  44. • 9:00 p.m. DFW radar • South to North cross section • Very low dBz’s aloft • Reflectivity max at 55 dBz’s Base Reflectivity Cross Section

  45. 3.5 + inches of rain • 9:00 p.m. total precip image • Areas received over 3.5 inches of rain

  46. Mesoscale Analysis of the Dallas and Fort Worth Storms of May 5, 1995

  47. Inverted Trough L 5:00 p.m. Surface Analysis

  48. • 850 mb moisture • Low-level jet • MesoHigh over LA 00Z May 6, 850 mb Moisture Transport

  49. • Theta-E bulge • Inverted Trough 850 mb Theta-E Chart

  50. Base Reflectivity Loop from 6:04 p.m. to 8:59 p.m.

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