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)
01L.NONAME
- Never strengthened into a tropical storm, ACE is zero
02L.Ana
- 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
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
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
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
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
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
- Never strengthened into a tropical storm, ACE is zero
09L.Grace
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
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
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)
01L.NONAME
- Tropical Cyclone Report
- Never strengthened into a tropical storm, ACE is zero
02L.Ana
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
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
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
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
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
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
- Tropical Cyclone Report
- Never strengthened into a tropical storm, ACE is zero
09L.Grace
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
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
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
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 |