2002 Atlantic Intense Hurricanes ISIDORE and LILI

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2002 Atlantic Intense Hurricanes ISIDORE and LILI

• Pressure - Wind Relationships
• Intensity / Structure
• Satellite Images

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Ranked Lists of the 29 Atlantic Intense (Cat. 3)
Hurricanes during 1995-2002

• MAXIMUM SURFACE WIND SPEED (knots)
•  
• 1. Mitch 155
• 2. Georges 135
• 3. Floyd 135
• 4. Lenny 135
• 5. Opal 130
• 6. Gert 130
• 7. Edouard 125
• 8. Bret 125
• 9. Iris 125
• 10. Lili 02 125
• 11. Felix 95 120
• 12. Luis 120
• 13. Hortense 120
• 14. Cindy 120
• 15. Isaac 120

• LOWEST MINIMUM SEA-LEVEL PRESSURE (hPa)
•  
• 1. Mitch 905
• 2. Opal 916
• 3. Floyd 921
• 4. Felix 95 929
• 5. Gert 930
• 6. Edouard 933
• 7. Lenny 933
• 8. Michelle 933
• 9. Isidore02 934
• 10. Luis 935
• 11. Hortense 935
• 12. Georges 937
• 13. Lili 02 938
• 14. Keith 939
• 15. Cindy 942

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Lists of the 29 Atlantic IHs, 1995-2002CONTINUED

• 16. Keith 120
• 17. Michelle 120
• 18. Erika 110
• 19. Alberto 110
• 20. Isidore02 110
• 21. Fran 105
• 22. Erin 105
• 23. Marilyn 100
• 24. Roxanne 100
• 25. Bertha 100
• 26. Bonnie 100
• 27. Isidore96 100
• 28. Lili 96 100
• 29. Felix 01 100

• 16. Isaac 943
• 17. Bret 944
• 18. Fran 946
• 19. Erika 946
• 20. Iris 948
• 21. Marilyn 949
• 22. Alberto 950
• 23. Bonnie 954
• 24. Roxanne 956
• 25. Bertha 960
• 26. Isidore96 960
• 27. Lili96 960
• 28. Felix 01 962
• 29. Erin 968

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ATL IHs ranked by Size R-34 kt (n. mi.)

• 1. Cindy 231
• 2. Luis 213
• 3. Erika 213
• 4. Floyd 201
• 5. Opal 188
• 6. Felix 01 185
• 7. Fran 181
• 8. Isaac 163
• 9. Bertha 156
• 10. Bonnie 150
• 11. Georges 144
• 12. Isidore02 144
• 13. Lili 02 143
• 14. Hortense 138
• 15. Gert 138

• 16. Felix 95 135
• 17. Mitch 131
• 18. Roxanne 130
• 19. Edouard 125
• 20. Lili 96 125
• 21. Alberto 125
• 22. Michelle 125
• 23. Lenny 124
• 24. Keith 115
• 25. Erin 113
• 26. Marilyn 105
• 27. Isidore96 90
• 28. Bret 78
• 29. Iris 69

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Satellite Images comparing the Eye of Isidore and
Lili at Maximum Intensity

• GOES IR 4-km Mercator remapped, centered, zoomed
  by factor of 2
• MODIS 2-km Truecolor Visible - large area
• MODIS 250-m Visible zoomed over eye

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Radius of Maximum Wind (RMW)

• From HRD Wind Analysis
• USAF recon
• Isidore 20.7 km (11.2 n.mi.)
• 0600-1145 UTC / 22 Sep
• Lili 14.7 km (8.0 n.mi.)
• 1502-1829 UTC / 2 Oct

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Radius of Maximum Wind (RMW)

• -from Extended Best Track (DeMaria, CIRA) data
  (operational estimates)
• Isidore 10 n. mi.
• Lili 5-10 n. mi.
• -from Kossin (CIMSS) algorithm for RMW from IR
  images (R of 55C IR T)
• -Isidore 12.0 km (6.5 n. mi.), 1145 UTC / 22
  Sep
• -Lili 12.5 km (6.8 n. mi.), 1845 UTC / 2 Oct

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RMW Influence on P-Wind Relationship

• For a given delta-p, smaller RMW is associated
  with a larger Vmax..

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Shape of radial pressure curve Influence on
P-Wind Relationship

• All other factors constant, a delta-p distributed
  through the eyewall wind maxima, as a v-shaped
  profile, will give a smaller Vmax than a
  u-shaped profile.

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Influences of the Tropical Cyclone Pressure
Wind Relationship

• Pressure Wind MSLP Vmax
• MSLP minimum sea-level pressure
• Vmax maximum surface wind (10-m, 1-min wind)
• 1) penv environmental pressure
• 2) RMW radius of maximum wind
• 3) Size (radial extent of gales, 34-kt)
• 4) shape of radial profile of pressure/wind
• 5) landfall effects

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Conclusion on differences in Lili and Isidores
P-Wind Relationships

• They are likely due to a combination of all
  influences except 3) Size
• Different environmental pressure, different land
  mass influences on wind, different RMWs and
  shape of pressure profile (Lilis more u-shaped)

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Animated IR -- Center Relative Average Images

• Each image is averaged over a 6-hr period using
  all available images. Images are created at 3-hr
  intervals.

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