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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. Opal916 3. Floyd921 4. Felix ‘95 929 5. Gert 930 6. Edouard933 7. Lenny 933 8. Michelle933

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2002 Atlantic Intense Hurricanes ISIDORE and LILI

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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. Opal916

3. Floyd921

4. Felix ‘95 929

5. Gert 930

6. Edouard933

7. Lenny 933

8. Michelle933

9. Isidore’02934

10. Luis 935

11. Hortense935

12. Georges937

13. Lili ’02938

14. Keith939

15. Cindy942

MAXIMUM SURFACE WIND SPEED (knots)

1. Mitch 155

2. Georges135

3. Floyd135

4. Lenny135

5. Opal 130

6. Gert 130

7. Edouard125

8. Bret125

9. Iris125

10. Lili ’02125

11. Felix ’95 120

12. Luis120

13. Hortense120

14. Cindy 120

15. Isaac120

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. Isaac943

17. Bret944

18. Fran946

19. Erika946

20. Iris948

21. Marilyn949

22. Alberto950

23. Bonnie 954

24. Roxanne956

25. Bertha 960

26. Isidore‘96960

27. Lili‘96960

28. Felix ‘01962

29. Erin968

16. Keith120

17. Michelle120

18. Erika110

19. Alberto 110

20. Isidore’02110

21. Fran105

22. Erin105

23. Marilyn100

24. Roxanne100

25. Bertha100

26. Bonnie100

27. Isidore’96100

28. Lili ‘96100

29. Felix ’01100

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


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

1. Cindy231

2. Luis 213

3. Erika213

4. Floyd201

5. Opal188

6. Felix ’01185

7. Fran181

8. Isaac163

9. Bertha156

10. Bonnie150

11. Georges144

12. Isidore’02 144

13. Lili ’02143

14. Hortense138

15. Gert138

16. Felix ‘95135

17. Mitch131

18. Roxanne130

19. Edouard125

20. Lili ‘96125

21. Alberto125

22. Michelle125

23. Lenny124

24. Keith115

25. Erin113

26. Marilyn105

27. Isidore‘9690

28. Bret78

29. Iris69

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)

  • 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)

  • -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

  • 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 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

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


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