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2002 Atlantic Intense Hurricanes ISIDORE and LILI. Pressure - Wind Relationships Intensity / Structure Satellite Images. 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

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2002 atlantic intense hurricanes isidore and lili l.jpg

2002 Atlantic Intense Hurricanes ISIDORE and LILI

Pressure - Wind Relationships

Intensity / Structure

Satellite Images


Ranked lists of the 29 atlantic intense cat 3 hurricanes during 1995 2002 l.jpg

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. Isidore’02 934

10. Luis 935

11. Hortense 935

12. Georges 937

13. Lili ’02 938

14. Keith 939

15. Cindy 942

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

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


Lists of the 29 atlantic ih s 1995 2002 continued l.jpg

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. Isidore‘96 960

27. Lili‘96 960

28. Felix ‘01 962

29. Erin 968

16. Keith 120

17. Michelle 120

18. Erika 110

19. Alberto 110

20. Isidore’02 110

21. Fran 105

22. Erin 105

23. Marilyn 100

24. Roxanne 100

25. Bertha 100

26. Bonnie 100

27. Isidore’96 100

28. Lili ‘96 100

29. Felix ’01 100

Lists of the 29 Atlantic IH’s, 1995-2002…CONTINUED


Atl ih s ranked by size r 34 kt n mi l.jpg

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. Isidore’02 144

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. Michelle125

23. Lenny 124

24. Keith 115

25. Erin 113

26. Marilyn 105

27. Isidore‘96 90

28. Bret 78

29. Iris 69

ATL IH’s ranked by Size – R-34 kt (n. mi.)


Satellite images comparing the eye of isidore and lili at maximum intensity l.jpg
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


Radius of maximum wind rmw l.jpg
Radius of Maximum Wind (RMW) Maximum Intensity

  • 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


Radius of maximum wind rmw35 l.jpg
Radius of Maximum Wind (RMW) Maximum Intensity

  • -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


Rmw influence on p wind relationship l.jpg
RMW Influence on P-Wind Relationship Maximum Intensity

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


Shape of radial pressure curve influence on p wind relationship l.jpg
“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.


Influences of the tropical cyclone pressure wind relationship l.jpg
Influences Relationship 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


Conclusion on differences in lili and isidore s p wind relationships l.jpg
Conclusion on differences in Lili and Isidore’s 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 RMW’s and shape of pressure profile (Lili’s more u-shaped)


Animated ir center relative average images l.jpg

Animated IR -- Center Relative Average Images Relationships

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


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