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Talk:2009 Atlantic hurricane season/ACE calcs

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This is the page for calculating the Accumulated Cyclone Energy for the 2009 Atlantic hurricane season.

The ACE is calculated by summing the squares of the estimated maximum sustained velocity of every active tropical storm (wind speed 35 knots or higher), at six-hour intervals. The numbers are usually divided by 10,000 to make them more manageable. The unit of ACE is 104 kt2, and for use as an index the unit is assumed. If any storms of a season happen to cross years, the storm's ACE counts for the previous year. [1]

where vmax is estimated sustained wind speed in knots.

Operational (Advisories)

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01L.NONAME

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  • Never strengthened into a tropical storm, ACE is zero

02L.Ana

[edit]
  • From 5 pm AST on August 13 to 12:30 am AST on August 15, the system was a low, not a tropical cyclone.
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1 11 August 6 am AST 25 Special
2 11 August 11 am AST 25 0
3 11 August 5 pm AST 25 0
4 11 August 11 pm AST 30 0
5 12 August 5 am AST 30 0
6 12 August 11 am AST 30 0
7 12 August 5 pm AST 30 0
8 12 August 11 pm AST 30 0
9 13 August 5 am AST 25 0
10 13 August 11 am AST 25 0
11 13 August 5 pm AST 25 Low
12 15 August 12:30 am AST 30 Special
13 15 August 5 am AST 35 0.1225
14 15 August 11 am AST 35 0.1225
15 15 August 5 pm AST 35 0.1225
16 15 August 11 pm AST 35 0.1225
17 16 August 5 am AST 35 0.1225
18 16 August 11 am AST 35 0.1225
19 16 August 5 pm AST 30 0
20 16 August 11 pm AST 30 0
21 17 August 5 am AST 30 0
22 17 August 11 am AST 30 0
23 17 August 5 pm AST 30 Low
Total       0.7350

03L.Bill

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Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1 15 August 11 am AST 30 0
2 15 August 5 pm AST 35 0.1225
3 15 August 11 pm AST 35 0.1225
4 16 August 5 am AST 40 0.1600
5 16 August 11 am AST 50 0.2500
6 16 August 5 pm AST 55 0.3025
7 16 August 11 pm AST 60 0.3600
8 17 August 5 am AST 65 0.4225
9 17 August 11 am AST 80 0.6400
10 17 August 5 pm AST 80 0.6400
11 17 August 11 pm AST 85 0.7225
12 18 August 5 am AST 85 0.7225
13 18 August 11 am AST 90 0.8100
14 18 August 5 pm AST 95 0.9025
15 18 August 11 pm AST 110 1.2100
16 19 August 5 am AST 115 1.3225
17 19 August 11 am AST 115 1.3225
18 19 August 5 pm AST 115 1.3225
19 19 August 11 pm AST 115 1.3225
20 20 August 5 am AST 110 1.2100
21 20 August 11 am AST 105 1.1025
22 20 August 5 pm AST 110 1.2100
23 20 August 11 pm AST 110 1.2100
24 21 August 5 am AST 105 1.1025
25 21 August 11 am AST 100 1.0000
26 21 August 5 pm AST 90 0.8100
27 21 August 11 pm AST 90 0.8100
28 22 August 5 am AST 90 0.8100
29 22 August 11 am AST 85 0.7225
30 22 August 5 pm AST 75 0.5625
31 22 August 11 pm AST 75 0.5625
32 23 August 5 am AST 75 0.5625
33 23 August 11 am AST 75 0.5625
34 23 August 5 pm AST 65 0.4225
35 23 August 11 pm AST 65 0.4225
36 24 August 5 am AST 60 EXT
Total       25.7600

04L.Claudette

[edit]
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1 16 August 5 am EDT 30 0
2 16 August 11 am EDT 30 0
3 16 August 2 pm EDT 45 Special
4 16 August 5 pm EDT 45 0.2025
5 16 August 10 pm CDT 45 0.2025
6 17 August 4 am CDT 35 0.1225
7 17 August 10 am CDT 30 0
8 17 August 4 pm CDT 25 0
9 17 August 10 pm CDT - Low
Total       0.5275

05L.Danny

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Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1 26 August 11 am EDT 40 0.1600
2 26 August 5 pm EDT 40 0.1600
3 26 August 11 pm EDT 45 0.2025
4 27 August 5 am EDT 50 0.2500
5 27 August 11 am EDT 50 0.2500
6 27 August 5 pm EDT 45 0.2025
7 27 August 11 pm EDT 40 0.1600
8 28 August 5 am EDT 35 0.1225
9 28 August 11 am EDT 35 0.1225
10 28 August 5 pm EDT 35 0.1225
11 28 August 11 pm EDT 35 0.1225
12 29 August 5 am EDT 30 Low
Total       1.8750

06L.Erika

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Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1 1 September 5 pm EDT 45 0.2025
2 1 September 11 pm AST 50 0.2500
3 2 September 5 am AST 45 0.2025
4 2 September 11 am AST 35 0.1225
5 2 September 5 pm AST 35 0.1225
6 2 September 11 pm AST 35 0.1225
7 3 September 5 am AST 35 0.1225
8 3 September 11 am AST 35 0.1225
9 3 September 5 pm AST 30 0
10 3 September 11 pm AST 25 Low
Total       1.2675

07L.Fred

[edit]
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1 7 September 5 pm AST 30 0
2 7 September 11 pm AST 35 0.1225
3 8 September 5 am AST 45 0.2025
4 8 September 11 am AST 55 0.3025
5 8 September 5 pm AST 60 0.3600
6 8 September 11 pm AST 65 0.4225
7 9 September 5 am AST 90 0.8100
8 9 September 11 am AST 105 1.1025
9 9 September 5 pm AST 100 1.0000
10 9 September 11 pm AST 90 0.8100
11 10 September 5 am AST 90 0.8100
12 10 September 11 am AST 85 0.7225
13 10 September 5 pm AST 80 0.6400
14 10 September 11 pm AST 75 0.5625
15 11 September 5 am AST 75 0.5625
16 11 September 11 am AST 70 0.4900
17 11 September 5 pm AST 60 0.3600
18 11 September 11 pm AST 50 0.2500
19 12 September 5 am AST 40 0.1600
20 12 September 11 am AST 35 0.1225
21 12 September 5 pm AST 30 Low
Total       9.8125

08L.NONAME

[edit]
  • Never strengthened into a tropical storm, ACE is zero

09L.Grace

[edit]
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1 4 October 11 pm AST 55 0.3025
2 5 October 5 am AST 60 0.3600
3 5 October 11 am AST 55 0.3025
4 5 October 5 pm AST 50 0.2500
5 5 October 11 pm AST 45 Absorbed
Total       1.2150

10L.Henri

[edit]
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1 6 October 5 pm AST 35 0.1225
2 6 October 11 pm AST 40 0.1600
3 7 October 5 am AST 45 0.2025
4 7 October 11 am AST 40 0.1600
5 7 October 5 pm AST 35 0.1225
6 7 October 11 pm AST 30 0
7 8 October 5 am AST 30 0
8 8 October 11 am AST 30 0
9 8 October 5 pm AST 25 Low
Total       0.7675

11L.Ida

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Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1 4 November 10 am EST 30 0
2 4 November 4 pm EST 50 0.2500
3 4 November 10 pm EST 55 0.3025
4 5 November 4 am EST 60 0.3600
5 5 November 10 am EST 65 0.4225
6 5 November 4 pm EST 50 0.2500
7 5 November 10 pm EST 30 0
8 6 November 4 am EST 30 0
9 6 November 10 am EST 30 0
10 6 November 4 pm EST 30 0
11 6 November 10 pm EST 30 0
12 7 November 4 am EST 40 0.1600
13 7 November 10 am EST 50 0.2500
14 7 November 4 pm EST 60 0.3600
15 7 November 10 pm EST 60 0.3600
16 8 November 1:15 am CST 80 Special
17 8 November 3 am CST 80 0.6400
18 8 November 9 am CST 80 0.6400
19 8 November 12 pm CST 85 Special
20 8 November 3 pm CST 85 0.7225
21 8 November 9 pm CST 90 0.8100
22 9 November 3 am CST 80 0.6400
23 9 November 9 am CST 60 0.3600
24 9 November 3 pm CST 60 0.3600
25 9 November 9 pm CST 55 0.3025
26 10 November 3 am CST 45 0.2025
27 10 November 9 am CST 30 EXT
Total       7.3925

Best Track (TCR)

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01L.NONAME

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02L.Ana

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Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
11 Aug 0600 UTC 25 0.0000
11 Aug 1200 UTC 25 0.0000
11 Aug 1800 UTC 25 0.0000
12 Aug 0000 UTC 30 0.0000
12 Aug 0600 UTC 30 0.0000
12 Aug 1200 UTC 35 0.1225
12 Aug 1800 UTC 35 0.1225
From 0000 UTC on August 13 to 0000 UTC on August 15,
the system was a low, not a tropical cyclone.
15 Aug 0600 UTC 35 0.1225
15 Aug 1200 UTC 35 0.1225
15 Aug 1800 UTC 35 0.1225
16 Aug 0000 UTC 35 0.1225
16 Aug 0600 UTC 35 0.1225
Total   0.8575

03L.Bill

[edit]
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
15 Aug 0600 UTC 30 0.0000
15 Aug 1200 UTC 30 0.0000
15 Aug 1800 UTC 35 0.1225
16 Aug 0000 UTC 35 0.1225
16 Aug 0600 UTC 40 0.1600
16 Aug 1200 UTC 50 0.2500
16 Aug 1800 UTC 55 0.3025
17 Aug 0000 UTC 60 0.3600
17 Aug 0600 UTC 65 0.4225
17 Aug 1200 UTC 75 0.5625
17 Aug 1800 UTC 80 0.6400
18 Aug 0000 UTC 85 0.7225
18 Aug 0600 UTC 90 0.8100
18 Aug 1200 UTC 95 0.9025
18 Aug 1800 UTC 100 1.0000
19 Aug 0000 UTC 105 1.1025
19 Aug 0600 UTC 115 1.3225
19 Aug 1200 UTC 115 1.3225
19 Aug 1800 UTC 115 1.3225
20 Aug 0000 UTC 115 1.3225
20 Aug 0600 UTC 115 1.3225
20 Aug 1200 UTC 105 1.1025
20 Aug 1800 UTC 110 1.2100
21 Aug 0000 UTC 110 1.2100
21 Aug 0600 UTC 105 1.1025
21 Aug 1200 UTC 100 1.0000
21 Aug 1800 UTC 95 0.9025
22 Aug 0000 UTC 90 0.8100
22 Aug 0600 UTC 90 0.8100
22 Aug 1200 UTC 85 0.7225
22 Aug 1800 UTC 80 0.6400
23 Aug 0000 UTC 80 0.6400
23 Aug 0600 UTC 75 0.5625
23 Aug 1200 UTC 70 0.4900
23 Aug 1800 UTC 65 0.4225
24 Aug 0000 UTC 65 0.4225
24 Aug 0600 UTC 60 0.3600
24 Aug 1200 UTC 60 EXT
Total   26.5000

04L.Claudette

[edit]
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
16 Aug 0600 UTC 30 0.0000
16 Aug 1200 UTC 35 0.1225
16 Aug 1800 UTC 50 0.2500
17 Aug 0000 UTC 45 0.2025
17 Aug 0600 UTC 40 0.1600
17 Aug 1200 UTC 25 0.0000
17 Aug 1800 UTC 20 0.0000
18 Aug 0000 UTC -- dissipated
Total   0.7350

05L.Danny

[edit]
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
26 Aug 1200 UTC 40 0.1600
26 Aug 1800 UTC 45 0.2025
27 Aug 0000 UTC 50 0.2500
27 Aug 0600 UTC 50 0.2500
27 Aug 1200 UTC 50 0.2500
27 Aug 1800 UTC 45 0.2025
28 Aug 0000 UTC 40 0.1600
28 Aug 0600 UTC 35 0.1225
28 Aug 1200 UTC 35 0.1225
28 Aug 1800 UTC 35 0.1225
29 Aug 0000 UTC 35 0.1225
29 Aug 0600 UTC -- absorbed
Total   1.9650

06L.Erika

[edit]
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
01 Sep 1800 UTC 45 0.2025
02 Sep 0000 UTC 45 0.2025
02 Sep 0600 UTC 45 0.2025
02 Sep 1200 UTC 35 0.1225
02 Sep 1800 UTC 35 0.1225
03 Sep 0000 UTC 35 0.1225
03 Sep 0600 UTC 40 0.1600
03 Sep 1200 UTC 40 0.1600
03 Sep 1800 UTC 30 0.0000
04 Sep 0000 UTC 25 Low
Total   1.2950

07L.Fred

[edit]
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
07 Sep 1800 UTC 30 0.0000
08 Sep 0000 UTC 35 0.1225
08 Sep 0600 UTC 45 0.2025
08 Sep 1200 UTC 55 0.3025
08 Sep 1800 UTC 60 0.3600
09 Sep 0000 UTC 70 0.4900
09 Sep 0600 UTC 90 0.8100
09 Sep 1200 UTC 105 1.1025
09 Sep 1800 UTC 100 1.0000
10 Sep 0000 UTC 95 0.9025
10 Sep 0600 UTC 90 0.8100
10 Sep 1200 UTC 85 0.7225
10 Sep 1800 UTC 80 0.6400
11 Sep 0000 UTC 80 0.6400
11 Sep 0600 UTC 75 0.5625
11 Sep 1200 UTC 65 0.4225
11 Sep 1800 UTC 55 0.3025
12 Sep 0000 UTC 50 0.2500
12 Sep 0600 UTC 40 0.1600
12 Sep 1200 UTC 35 0.1225
12 Sep 1800 UTC 30 Low
Total   9.9250

08L.NONAME

[edit]

09L.Grace

[edit]
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
04 Oct 0600 UTC 40 0.1600
04 Oct 1200 UTC 45 0.2025
04 Oct 1800 UTC 50 0.2500
05 Oct 0000 UTC 55 0.3025
05 Oct 0600 UTC 55 0.3025
05 Oct 1200 UTC 55 0.3025
05 Oct 1800 UTC 50 0.2500
06 Oct 0000 UTC 45 0.2025
06 Oct 0600 UTC 40 EXTRA
Total   1.9725

10L.Henri

[edit]
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
06 Oct 0000 UTC 30 0.0000
06 Oct 0600 UTC 35 0.1225
06 Oct 1200 UTC 35 0.1225
06 Oct 1800 UTC 35 0.1225
07 Oct 0000 UTC 40 0.1600
07 Oct 0600 UTC 45 0.2025
07 Oct 1200 UTC 45 0.2025
07 Oct 1800 UTC 40 0.1600
08 Oct 0000 UTC 35 0.1225
08 Oct 0600 UTC 30 0.0000
08 Oct 1200 UTC 30 0.0000
08 Oct 1800 UTC 25 0.0000
Total   1.2150

11L.Ida

[edit]
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
04 Nov 0600 UTC 30 0.0000
04 Nov 1200 UTC 35 0.1225
04 Nov 1800 UTC 45 0.2025
05 Nov 0000 UTC 55 0.3025
05 Nov 0600 UTC 65 0.4225
05 Nov 1200 UTC 70 0.4900
05 Nov 1800 UTC 50 0.2500
06 Nov 0000 UTC 35 0.1225
06 Nov 0600 UTC 30 0.0000
06 Nov 1200 UTC 30 0.0000
06 Nov 1800 UTC 30 0.0000
07 Nov 0000 UTC 30 0.0000
07 Nov 0600 UTC 35 0.1225
07 Nov 1200 UTC 55 0.3025
07 Nov 1800 UTC 60 0.3600
08 Nov 0000 UTC 70 0.4900
08 Nov 0600 UTC 80 0.6400
08 Nov 1200 UTC 85 0.7225
08 Nov 1800 UTC 85 0.7225
09 Nov 0000 UTC 90 0.8100
09 Nov 0600 UTC 80 0.6400
09 Nov 1200 UTC 60 0.3600
09 Nov 1800 UTC 65 0.4225
10 Nov 0000 UTC 60 0.3600
10 Nov 0600 UTC 50 0.2500
10 Nov 1200 UTC 35 extratropical
Total   8.115

Season total

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Storm Type ACE (104 kt2)
01L (NONAME) Best Track 0.0000
02L (Ana) Best Track 0.8575
03L (Bill) Best Track 26.5000
04L (Claudette) Best Track 0.7350
05L (Danny) Best Track 1.9650
06L (Erika) Best Track 1.2950
07L (Fred) Best Track 9.9250
08L (NONAME) Best Track 0.0000
09L (Grace) Best Track 1.9725
10L (Henri) Best Track 1.2150
11L (Ida) Best Track 8.1150
Total 52.58

See also

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References

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