Talk:2011 Pacific typhoon season/ACE calcs

This is the page for calculating the Accumulated Cyclone Energy for the 2011 Pacific typhoon season using data from the Japan Meteorological Agency.

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.

$\sum _{}^{}{\frac {{v_{\mathrm {max} }}^{2}}{10^{4}}},$

where v_max is estimated sustained wind speed in knots.

Aere (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
07 May	1200 UTC	35	0.1225
07 May	1800 UTC	35	0.1225
08 May	0000 UTC	35	0.1225
08 May	0600 UTC	35	0.1225
08 May	1200 UTC	40	0.1600
08 May	1800 UTC	40	0.1600
09 May	0000 UTC	40	0.1600
09 May	0600 UTC	35	0.1225
09 May	1200 UTC	35	0.1225
09 May	1800 UTC	35	0.1225
10 May	0000 UTC	35	0.1225
10 May	0600 UTC	35	0.1225
10 May	1200 UTC	35	0.1225
10 May	1800 UTC	35	0.1225
11 May	0000 UTC	35	0.1225
11 May	0600 UTC	35	0.1225
11 May	1200 UTC	35	0.1225
Total			2.1950

Songda (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
21 May	1200 UTC	35	0.1225
21 May	1800 UTC	35	0.1225
22 May	0000 UTC	40	0.1600
22 May	0600 UTC	45	0.2025
22 May	1200 UTC	50	0.2500
22 May	1800 UTC	50	0.2500
23 May	0000 UTC	50	0.2500
23 May	0600 UTC	50	0.2500
23 May	1200 UTC	55	0.3025
23 May	1800 UTC	55	0.3025
24 May	0000 UTC	55	0.3025
24 May	0600 UTC	60	0.3600
24 May	1200 UTC	60	0.3600
24 May	1800 UTC	65	0.4225
25 May	0000 UTC	70	0.4900
25 May	0600 UTC	75	0.5625
25 May	1200 UTC	85	0.7225
25 May	1800 UTC	95	0.9025
26 May	0000 UTC	100	1.0000
26 May	0600 UTC	105	1.1025
26 May	1200 UTC	105	1.1025
26 May	1800 UTC	105	1.1025
27 May	0000 UTC	105	1.1025
27 May	0600 UTC	100	1.0000
27 May	1200 UTC	95	0.9025
27 May	1800 UTC	90	0.8100
28 May	0000 UTC	90	0.8100
28 May	0600 UTC	90	0.8100
28 May	1200 UTC	80	0.6400
28 May	1800 UTC	70	0.4900
29 May	0000 UTC	60	0.3600
Total			17.5675

Sarika (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
09 June	1200 UTC	35	0.1225
09 June	1800 UTC	40	0.1600
10 June	0000 UTC	40	0.1600
10 June	0600 UTC	40	0.1600
10 June	1200 UTC	35	0.1225
10 June	1800 UTC	35	0.1225
11 June	0000 UTC	35	0.1225
Total			0.9700

Haima (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
21 June	1200 UTC	35	0.1225
21 June	1800 UTC	35	0.1225
22 June	0000 UTC	35	0.1225
22 June	0600 UTC	35	0.1225
22 June	1200 UTC	40	0.1600
22 June	1800 UTC	40	0.1600
23 June	0000 UTC	40	0.1600
23 June	0600 UTC	40	0.1600
23 June	1200 UTC	35	0.1225
23 June	1800 UTC	35	0.1225
24 June	0000 UTC	40	0.1600
24 June	0600 UTC	40	0.1600
24 June	1200 UTC	35	0.1225
Total			1.8175

Meari (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
22 June	0000 UTC	35	0.1225
22 June	0600 UTC	35	0.1225
22 June	1200 UTC	40	0.1600
22 June	1800 UTC	45	0.2025
23 June	0000 UTC	50	0.2500
23 June	0600 UTC	50	0.2500
23 June	1200 UTC	50	0.2500
23 June	1800 UTC	50	0.2500
24 June	0000 UTC	55	0.3025
24 June	0600 UTC	55	0.3025
24 June	1200 UTC	60	0.3600
24 June	1800 UTC	60	0.3600
25 June	0000 UTC	60	0.3600
25 June	0600 UTC	60	0.3600
25 June	1200 UTC	55	0.3025
25 June	1800 UTC	55	0.3025
26 June	0000 UTC	55	0.3025
26 June	0600 UTC	55	0.3025
26 June	1200 UTC	55	0.3025
26 June	1800 UTC	50	0.2500
27 June	0000 UTC	45	0.2025
Total			5.6175

Ma-on (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
12 July	0000 UTC	35	0.1225
12 July	0600 UTC	35	0.1225
12 July	1200 UTC	40	0.1600
12 July	1800 UTC	45	0.2025
13 July	0000 UTC	50	0.2500
13 July	0600 UTC	50	0.2500
13 July	1200 UTC	55	0.3025
13 July	1800 UTC	60	0.3600
14 July	0000 UTC	65	0.4225
14 July	0600 UTC	65	0.4225
14 July	1200 UTC	75	0.5625
14 July	1800 UTC	75	0.5625
15 July	0000 UTC	80	0.6400
15 July	0600 UTC	80	0.6400
15 July	1200 UTC	85	0.7225
15 July	1800 UTC	85	0.7225
16 July	0000 UTC	85	0.7225
16 July	0600 UTC	95	0.9025
16 July	1200 UTC	95	0.9025
16 July	1800 UTC	95	0.9025
17 July	0000 UTC	95	0.9025
17 July	0600 UTC	85	0.7225
17 July	1200 UTC	85	0.7225
17 July	1800 UTC	80	0.6400
18 July	0000 UTC	80	0.6400
18 July	0600 UTC	75	0.5625
18 July	1200 UTC	75	0.5625
18 July	1800 UTC	75	0.5625
19 July	0000 UTC	75	0.5625
19 July	0600 UTC	75	0.5625
19 July	1200 UTC	75	0.5625
19 July	1800 UTC	65	0.4225
20 July	0000 UTC	55	0.3025
20 July	0600 UTC	55	0.3025
20 July	1200 UTC	50	0.2500
20 July	1800 UTC	50	0.2500
21 July	0000 UTC	45	0.2025
21 July	0600 UTC	45	0.2025
21 July	1200 UTC	45	0.2025
21 July	1800 UTC	45	0.2025
22 July	0000 UTC	45	0.2025
22 July	0600 UTC	45	0.2025
22 July	1200 UTC	45	0.2025
22 July	1800 UTC	45	0.2025
23 July	0000 UTC	45	0.2025
23 July	0600 UTC	45	0.2025
23 July	1200 UTC	45	0.2025
23 July	1800 UTC	45	0.2025
24 July	0000 UTC	45	0.2025
24 July	0600 UTC	45	0.2025
Total			21.2600

Tokage (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
15 July	0000 UTC	35	0.1225
15 July	0600 UTC	35	0.1225
15 July	1200 UTC	35	0.1225
Total			0.3675

Nock-ten (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
26 July	0000 UTC	35	0.1225
26 July	0600 UTC	40	0.1600
26 July	1200 UTC	45	0.2025
26 July	1800 UTC	45	0.2025
27 July	0000 UTC	45	0.2025
27 July	0600 UTC	45	0.2025
27 July	1200 UTC	45	0.2025
27 July	1800 UTC	45	0.2025
28 July	0000 UTC	45	0.2025
28 July	0600 UTC	50	0.2500
28 July	1200 UTC	50	0.2500
28 July	1800 UTC	50	0.2500
29 July	0000 UTC	50	0.2500
29 July	0600 UTC	50	0.2500
29 July	1200 UTC	50	0.2500
29 July	1800 UTC	50	0.2500
30 July	0000 UTC	50	0.2500
30 July	0600 UTC	45	0.2025
30 July	1200 UTC	40	0.1600
30 July	1800 UTC	35	0.1225
Total			4.1850

Muifa (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
28 July	0600 UTC	35	0.1225
28 July	1200 UTC	40	0.1600
28 July	1800 UTC	45	0.2025
29 July	0000 UTC	45	0.2025
29 July	0600 UTC	45	0.2025
29 July	1200 UTC	50	0.2500
29 July	1800 UTC	60	0.3600
30 July	0000 UTC	65	0.4225
30 July	0600 UTC	75	0.5625
30 July	1200 UTC	90	0.8100
30 July	1800 UTC	95	0.9025
31 July	0000 UTC	95	0.9025
31 July	0600 UTC	95	0.9025
31 July	1200 UTC	95	0.9025
31 July	1800 UTC	95	0.9025
01 August	0000 UTC	90	0.8100
01 August	0600 UTC	85	0.7225
01 August	1200 UTC	85	0.7225
01 August	1800 UTC	85	0.7225
02 August	0000 UTC	85	0.7225
02 August	0600 UTC	85	0.7225
02 August	1200 UTC	85	0.7225
02 August	1800 UTC	85	0.7225
03 August	0000 UTC	85	0.7225
03 August	0600 UTC	85	0.7225
03 August	1200 UTC	85	0.7225
03 August	1800 UTC	85	0.7225
04 August	0000 UTC	85	0.7225
04 August	0600 UTC	85	0.7225
04 August	1200 UTC	85	0.7225
04 August	1800 UTC	85	0.7225
05 August	0000 UTC	85	0.7225
05 August	0600 UTC	85	0.7225
05 August	1200 UTC	80	0.6400
05 August	1800 UTC	80	0.6400
06 August	0000 UTC	75	0.5625
06 August	0600 UTC	70	0.4900
06 August	1200 UTC	65	0.4225
06 August	1800 UTC	65	0.4225
07 August	0000 UTC	65	0.4225
07 August	0600 UTC	60	0.3600
07 August	1200 UTC	60	0.3600
07 August	1800 UTC	55	0.3025
08 August	0000 UTC	55	0.3025
08 August	0600 UTC	50	0.2500
08 August	1200 UTC	40	0.1600
08 August	1800 UTC	35	0.1225
Total			26.3575

Merbok (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
03 August	0600 UTC	35	0.1225
03 August	1200 UTC	35	0.1225
03 August	1800 UTC	35	0.1225
04 August	0000 UTC	35	0.1225
04 August	0600 UTC	35	0.1225
04 August	1200 UTC	35	0.1225
04 August	1800 UTC	35	0.1225
05 August	0000 UTC	40	0.1600
05 August	0600 UTC	45	0.2025
05 August	1200 UTC	45	0.2025
05 August	1800 UTC	45	0.2025
06 August	0000 UTC	50	0.2500
06 August	0600 UTC	50	0.2500
06 August	1200 UTC	50	0.2500
06 August	1800 UTC	50	0.2500
07 August	0000 UTC	50	0.2500
07 August	0600 UTC	50	0.2500
07 August	1200 UTC	50	0.2500
07 August	1800 UTC	50	0.2500
08 August	0000 UTC	50	0.2500
08 August	0600 UTC	50	0.2500
08 August	1200 UTC	50	0.2500
08 August	1800 UTC	50	0.2500
09 August	0000 UTC	50	0.2500
09 August	0600 UTC	45	0.2025
09 August	1200 UTC	45	0.2025
Total			5.28

Nanmadol (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
23 August	1200 UTC	35	0.1225
23 August	1800 UTC	40	0.1600
24 August	0000 UTC	45	0.2025
24 August	0600 UTC	50	0.2500
24 August	1200 UTC	55	0.3025
24 August	1800 UTC	60	0.3600
25 August	0000 UTC	65	0.4225
25 August	0600 UTC	75	0.5625
25 August	1200 UTC	80	0.6400
25 August	1800 UTC	90	0.8100
26 August	0000 UTC	100	1.0000
26 August	0600 UTC	100	1.0000
26 August	1200 UTC	100	1.0000
26 August	1800 UTC	95	0.9025
27 August	0000 UTC	90	0.8100
27 August	0600 UTC	85	0.7225
27 August	1200 UTC	80	0.6400
27 August	1800 UTC	70	0.4900
28 August	0000 UTC	65	0.4225
28 August	0600 UTC	65	0.4225
28 August	1200 UTC	60	0.3600
28 August	1800 UTC	60	0.3600
29 August	0000 UTC	55	0.3025
29 August	0600 UTC	50	0.2500
29 August	1200 UTC	50	0.2500
29 August	1800 UTC	45	0.2025
30 August	0000 UTC	45	0.2025
30 August	0600 UTC	40	0.1600
30 August	1200 UTC	40	0.1600
30 August	1800 UTC	35	0.1225
Total			13.6125

Talas (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
25 August	0000 UTC	35	0.1225
25 August	0600 UTC	35	0.1225
25 August	1200 UTC	40	0.1600
25 August	1800 UTC	40	0.1600
26 August	0000 UTC	45	0.2025
26 August	0600 UTC	45	0.2025
26 August	1200 UTC	45	0.2025
26 August	1800 UTC	45	0.2025
27 August	0000 UTC	45	0.2025
27 August	0600 UTC	45	0.2025
27 August	1200 UTC	50	0.2500
27 August	1800 UTC	50	0.2500
28 August	0000 UTC	50	0.2500
28 August	0600 UTC	50	0.2500
28 August	1200 UTC	50	0.2500
28 August	1800 UTC	50	0.2500
29 August	0000 UTC	50	0.2500
29 August	0600 UTC	50	0.2500
29 August	1200 UTC	50	0.2500
29 August	1800 UTC	50	0.2500
30 August	0000 UTC	50	0.2500
30 August	0600 UTC	50	0.2500
30 August	1200 UTC	50	0.2500
30 August	1800 UTC	50	0.2500
31 August	0000 UTC	50	0.2500
31 August	0600 UTC	50	0.2500
31 August	1200 UTC	50	0.2500
31 August	1800 UTC	50	0.2500
01 September	0000 UTC	50	0.2500
01 September	0600 UTC	50	0.2500
01 September	1200 UTC	50	0.2500
01 September	1800 UTC	50	0.2500
02 September	0000 UTC	50	0.2500
02 September	0600 UTC	50	0.2500
02 September	1200 UTC	50	0.2500
02 September	1800 UTC	50	0.2500
03 September	0000 UTC	50	0.2500
03 September	0600 UTC	50	0.2500
03 September	1200 UTC	45	0.2025
03 September	1800 UTC	45	0.2025
04 September	0000 UTC	40	0.1600
04 September	0600 UTC	40	0.1600
04 September	1200 UTC	40	0.1600
04 September	1800 UTC	40	0.1600
05 September	0000 UTC	40	0.1600
Total			9.985

Noru (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
03 September	1200 UTC	35	0.1225
03 September	1800 UTC	40	0.1600
04 September	0000 UTC	40	0.1600
04 September	0600 UTC	40	0.1600
04 September	1200 UTC	40	0.1600
04 September	1800 UTC	40	0.1600
05 September	0000 UTC	40	0.1600
05 September	0600 UTC	40	0.1600
05 September	1200 UTC	40	0.1600
05 September	1800 UTC	40	0.1600
06 September	0000 UTC	40	0.1600
06 September	0600 UTC	40	0.1600
Total			1.8825

Kulap (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
07 September	0000 UTC	35	0.1225
07 September	0600 UTC	35	0.1225
07 September	1200 UTC	35	0.1225
07 September	1800 UTC	35	0.1225
08 September	0000 UTC	35	0.1225
08 September	0600 UTC	35	0.1225
08 September	1200 UTC	35	0.1225
08 September	1800 UTC	35	0.1225
Total			0.98

Roke (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
13 September	0600 UTC	35	0.1225
13 September	1200 UTC	35	0.1225
13 September	1800 UTC	35	0.1225
14 September	0000 UTC	35	0.1225
14 September	0600 UTC	35	0.1225
14 September	1200 UTC	35	0.1225
14 September	1800 UTC	35	0.1225
15 September	0000 UTC	35	0.1225
15 September	0600 UTC	40	0.1600
15 September	1200 UTC	40	0.1600
15 September	1800 UTC	40	0.1600
16 September	0000 UTC	40	0.1600
16 September	0600 UTC	45	0.2025
16 September	1200 UTC	45	0.2025
16 September	1800 UTC	45	0.2025
17 September	0000 UTC	45	0.2025
17 September	0600 UTC	50	0.2500
17 September	1200 UTC	55	0.3025
17 September	1800 UTC	60	0.3600
18 September	0000 UTC	60	0.3600
18 September	0600 UTC	60	0.3600
18 September	1200 UTC	60	0.3600
18 September	1800 UTC	60	0.3600
19 September	0000 UTC	60	0.3600
19 September	0600 UTC	60	0.3600
19 September	1200 UTC	65	0.4225
19 September	1800 UTC	70	0.4900
20 September	0000 UTC	75	0.5625
20 September	0600 UTC	80	0.6400
20 September	1200 UTC	85	0.7225
20 September	1800 UTC	85	0.7225
21 September	0000 UTC	80	0.6400
21 September	0600 UTC	75	0.5625
21 September	1200 UTC	65	0.4225
21 September	1800 UTC	65	0.4225
22 September	0000 UTC	60	0.3600
Total			11.47

Sonca (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
15 September	0600 UTC	35	0.1225
15 September	1200 UTC	35	0.1225
15 September	1800 UTC	35	0.1225
16 September	0000 UTC	40	0.1600
16 September	0600 UTC	40	0.1600
16 September	1200 UTC	40	0.1600
16 September	1800 UTC	40	0.1600
17 September	0000 UTC	45	0.2025
17 September	0600 UTC	50	0.2500
17 September	1200 UTC	55	0.3025
17 September	1800 UTC	55	0.3025
18 September	0000 UTC	60	0.3600
18 September	0600 UTC	65	0.4225
18 September	1200 UTC	65	0.4225
18 September	1800 UTC	65	0.4225
19 September	0000 UTC	70	0.4900
19 September	0600 UTC	70	0.4900
19 September	1200 UTC	70	0.4900
19 September	1800 UTC	70	0.4900
20 September	0000 UTC	65	0.4225
20 September	0600 UTC	60	0.3600
Total			6.435

Nesat (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
24 September	0000 UTC	35	0.1225
24 September	0600 UTC	35	0.1225
24 September	1200 UTC	40	0.1600
24 September	1800 UTC	45	0.2025
25 September	0000 UTC	50	0.2500
25 September	0600 UTC	50	0.2500
25 September	1200 UTC	55	0.3025
25 September	1800 UTC	60	0.3600
26 September	0000 UTC	70	0.4900
26 September	0600 UTC	70	0.4900
26 September	1200 UTC	75	0.5625
26 September	1800 UTC	80	0.6400
27 September	0000 UTC	75	0.5625
27 September	0600 UTC	65	0.4225
27 September	1200 UTC	65	0.4225
27 September	1800 UTC	65	0.4225
28 September	0000 UTC	65	0.4225
28 September	0600 UTC	65	0.4225
28 September	1200 UTC	65	0.4225
28 September	1800 UTC	65	0.4225
29 September	0000 UTC	65	0.4225
29 September	0600 UTC	65	0.4225
29 September	1200 UTC	65	0.4225
29 September	1800 UTC	55	0.3025
30 September	0000 UTC	50	0.2500
30 September	0600 UTC	45	0.2025
30 September	1200 UTC	35	0.1225
Total			9.6175

Haitang (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
25 September	0000 UTC	35	0.1225
25 September	0600 UTC	35	0.1225
25 September	1200 UTC	35	0.1225
25 September	1800 UTC	35	0.1225
26 September	0000 UTC	35	0.1225
26 September	0600 UTC	35	0.1225
26 September	1200 UTC	35	0.1225
Total			0.8575

Nalgae (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
27 September	1800 UTC	35	0.1225
28 September	0000 UTC	40	0.1600
28 September	0600 UTC	45	0.2025
28 September	1200 UTC	50	0.2500
28 September	1800 UTC	55	0.3025
29 September	0000 UTC	60	0.3600
29 September	0600 UTC	65	0.4225
29 September	1200 UTC	75	0.5625
29 September	1800 UTC	80	0.6400
30 September	0000 UTC	80	0.6400
30 September	0600 UTC	85	0.7225
30 September	1200 UTC	90	0.8100
30 September	1800 UTC	90	0.8100
01 October	0000 UTC	95	0.9025
01 October	0600 UTC	85	0.7225
01 October	1200 UTC	75	0.5625
01 October	1800 UTC	70	0.4900
02 October	0000 UTC	65	0.4225
02 October	0600 UTC	60	0.3600
02 October	1200 UTC	55	0.3025
02 October	1800 UTC	50	0.2500
03 October	0000 UTC	50	0.2500
03 October	0600 UTC	50	0.2500
03 October	1200 UTC	50	0.2500
03 October	1800 UTC	45	0.2025
04 October	0000 UTC	45	0.2025
04 October	0600 UTC	40	0.1600
04 October	1200 UTC	35	0.1225
Total			11.455

Banyan (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
10 October	1800 UTC	35	0.1225
11 October	0000 UTC	35	0.1225
Total			0.245

Washi (Best Track)

Date	Time	Maximum Sustained Winds (kt)	ACE (104 kt2)
15 December	0600 UTC	35	0.1225
15 December	1200 UTC	40	0.1600
15 December	1800 UTC	40	0.1600
16 December	0000 UTC	45	0.2025
16 December	0600 UTC	50	0.2500
16 December	1200 UTC	40	0.1600
16 December	1800 UTC	35	0.1225
17 December	0000 UTC	40	0.1600
17 December	0600 UTC	40	0.1600
17 December	1200 UTC	40	0.1600
17 December	1800 UTC	35	0.1225
18 December	0000 UTC	35	0.1225
18 December	0600 UTC	35	0.1225
18 December	1200 UTC	35	0.1225
18 December	1800 UTC	35	0.1225
Total			2.27

Season total

Storm	Type	ACE (104 kt2)
1101 Aere	Best Track	2.1950
1102 Songda	Best Track	17.5675
1103 Sarika	Best Track	0.9700
1104 Haima	Best Track	1.8175
1105 Meari	Best Track	5.6175
1106 Ma-on	Best Track	21.2600
1107 Tokage	Best Track	0.3675
1108 Nock-ten	Best Track	4.1850
1109 Muifa	Best Track	26.3575
1110 Merbok	Best Track	5.2800
1111 Nanmadol	Best Track	13.6125
1112 Talas	Best Track	9.9850
1113 Noru	Best Track	1.8825
1114 Kulap	Best Track	0.9800
1115 Roke	Best Track	11.4700
1116 Sonca	Best Track	6.4350
1117 Nesat	Best Track	9.6175
1118 Haitang	Best Track	0.8575
1119 Nalgae	Best Track	11.4550
1120 Banyan	Best Track	0.2450
1121 Washi	Best Track	2.2700
Total		154.4275

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