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Weather Discussion

This document provides a comprehensive analysis of Tropical Storm Arlene at its landfall in Brownsville, TX, during July 2011. It includes microwave imagery, 500-mb analyses, and surface analysis data from June 30 to July 4, detailing atmospheric conditions and dry air presence. The findings discuss transverse bands associated with convective systems, their occurrence timing, and implications for aviation turbulence, offering insights into storm dynamics based on historical data.

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Weather Discussion

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  1. Weather Discussion 7-5-2011

  2. Tropical Storm Arlene at Landfall

  3. Microwave Imagery of Tropical Storm Arlene at Landfall

  4. Brownsville, TX Radar

  5. 500-mb Analysis (12Z on 6/30 – Thursday Morning)

  6. U.S. Surface Analysis (12Z on 6/30 – Thursday Morning)

  7. N.C. Surface Analysis (12Z on 6/30 – Thursday Morning)

  8. GSO Sounding (12Z on 6/30 – Thursday Morning)

  9. Dry air aloft (00Z on Thursday)…

  10. 500-mb Analysis (00Z on 7/1 – Thursday Evening)

  11. U.S. Surface Analysis (00Z on 7/1 – Thursday Evening)

  12. N.C. Surface Analysis (00Z on 7/1 – Thursday Evening)

  13. GSO Sounding (00Z on 7/1 – Thursday Evening)

  14. GSO Back Trajectories (00Z on 7/1 – Thursday Evening)

  15. 500-mb Analysis (12Z on 7/1 – Friday Morning)

  16. U.S. Surface Analysis (12Z on 7/1 – Friday Morning)

  17. N.C. Surface Analysis (12Z on 7/1 – Friday Morning)

  18. GSO Sounding (12Z on 7/1 – Friday Morning)

  19. Visible Satellite Imagery (Friday Afternoon at 2:00PM)

  20. Water Vapor Imagery (Friday Afternoon at 2:00PM)

  21. IR Satellite Imagery (Friday Afternoon at 4:00PM)

  22. A little bit about transverse cirrus bands… • “The ideal case for band production appeared to be a strong, isolated convective system that developed, matured, and dissipated without interacting with any other convective storm” (Lenz et al. [2009], 1365). • “Transverse bands were more commonly observed to emerge near the end of the mature stage of the [convective] system and persist through the decay stage of the system” (Lenz et al. [2009], 1365). • “Transverse bands were observed at all hours of the day, though they were most common during the nighttime hours of this study” (Lenz et al. [2009], 1368). • “The average time lag between convection initiation and the first observation of transverse bands was 7 hours, and the average duration of the bands was about 9 hours” (Lenz et al. [2009], 1369, 1372). • Most commonly develop in regions of upper-level divergence and a strong relative vorticity gradient

  23. Geographic Distribution (May – August 2006) Lenz et al. (2009) pg. 1368

  24. Transverse Bands and Aviation Turbulence Lenz et al. (2009) pg. 1364

  25. 500-mb Analysis (00Z on 7/2 – Friday Evening)

  26. U.S. Surface Analysis (00Z on 7/2 – Friday Evening)

  27. N.C. Surface Analysis (00Z on 7/2 – Friday Evening)

  28. GSO Sounding (00Z on 7/2 – Friday Evening)

  29. GSO Back Trajectories (00Z on 7/2 – Friday Evening)

  30. 500-mb Analysis (12Z on 7/2 – Saturday Morning)

  31. U.S. Surface Analysis (12Z on 7/2 – Saturday Morning)

  32. N.C. Surface Analysis (12Z on 7/2 – Saturday Morning)

  33. GSO Sounding (12Z on 7/2 – Saturday Morning)

  34. 500-mb Analysis (00Z on 7/3 – Saturday Evening)

  35. U.S. Surface Analysis (00Z on 7/3 – Saturday Evening)

  36. N.C. Surface Analysis (00Z on 7/3 – Saturday Evening)

  37. GSO Sounding (00Z on 7/3 – Saturday Evening)

  38. GSO Back Trajectories (00Z on 7/3 – Saturday Evening)

  39. 500-mb Analysis (12Z on 7/3 – Sunday Morning)

  40. U.S. Surface Analysis (12Z on 7/3 – Sunday Morning)

  41. N.C. Surface Analysis (12Z on 7/3 – Sunday Morning)

  42. GSO Sounding (12Z on 7/3 – Sunday Morning)

  43. 500-mb Analysis (00Z on 7/4 – Sunday Evening)

  44. U.S. Surface Analysis (00Z on 7/4 – Sunday Evening)

  45. N.C. Surface Analysis (00Z on 7/4 – Sunday Evening)

  46. GSO Sounding (00Z on 7/4 – Sunday Evening)

  47. GSO Back Trajectories (00Z on 7/4 – Sunday Evening)

  48. 500-mb Analysis (12Z on 7/4 – Monday Morning)

  49. U.S. Surface Analysis (12Z on 7/4 – Monday Morning)

  50. N.C. Surface Analysis (12Z on 7/4 – Monday Morning)

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