Talk:2025 Pacific hurricane season/ACE calcs

This is the page for calculating the Accumulated cyclone energy for the 2025 Pacific hurricane season. If any storms of a season happen to cross years, the storm's ACE counts for the previous year.[1] 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 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. Thus,

where vmax is estimated sustained wind speed in knots.

Operational (Advisories)

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Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1May 283 pm CST300
2May 289 pm CST300
3May 292 pm MST300
4May 298 am MST350.1225
5May 292 pm MST500.2500
6May 298 pm MST500.2500
7May 302 am MST450.2025
8May 308 am MST450.2025
9May 302 pm MST450.2025
10May 308 pm MST400.1600
11May 312 am MST350.1225
12May 318 am MST30Post-tropical
Total   1.5125
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1June 83 am CST400.1600
2June 89 am CST500.2500
3June 83 pm CST500.2500
4June 89 pm CST550.3025
5June 92 am MST600.3600
6June 98 am MST650.4225
7June 92 pm MST650.4225
8June 98 pm MST600.3600
9June 102 am MST500.2500
10June 108 am MST450.2025
11June 102 pm MST400.1600
12June 108 pm MST30Post-tropical
Total   2.9375
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1June 88 am MST300
2June 82 pm MST400.1600
3June 88 pm MST400.1600
4June 92 am MST450.2025
5June 98 zm MST550.3025
6June 92 pm MST600.3600
7June 98 pm MST600.3600
8June 102 am MST600.3600
9June 108 am MST550.3025
10June 102 pm MST450.2025
11June 108 pm MST400.1600
12June 112 am MST350.1225
13June 118 am MST30Post-tropical
Total   2.6925
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1June 123 pm CST30Potential
2June 129 pm CST30Potential
3June 133 am CST30Potential
4June 139 am CST300
5June 133 pm CST350.1225
6June 139 pm CST300.1225
7June 143 am CST450.2025
8June 149 am CST500.2500
9June 143 pm CST550.3025
10June 148 pm MST550.3025
11June 152 am CST550.3025
12June 158 pm MST450.2025
13June 152 pm MST400.1600
14June 158 pm MST30Post-tropical
Total   1.9675
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1June 163 pm CST30Potential
2June 169 pm CST300
3June 173 am CST350.1225
4June 179 am CST400.1600
5June 173 pm CST450.2025
6June 179 pm CST500.2500
7June 183 am CST550.3025
8June 189 am CST750.5625
9June 183 pm CST950.9025
10June 189 pm CST1101.2100
11June 1912 am CST125Special
12June 193 am CST1201.4000
13June 199 am CST750.5625
14June 193 pm CST450.2025
15June 199 pm CST25Post-tropical
Total   5.8775
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1June 293 am CST300
2June 299 am CST350.1225
3June 293 pm CST350.1225
4June 299 pm CST350.1225
5June 303 am CST400.1600
6June 309 am CST500.2500
7June 303 pm CST550.3025
8June 309 pm CST650.4225
9July 13 am CST750.5625
10July 19 am CST850.7225
11July 12 pm MST950.9025
12July 18 pm MST1001.0000
13July 22 am MST1001.0000
14July 28 am MST950.9025
15July 22 pm MST850.7225
16July 28 pm MST650.4225
17July 32 am MST500.2500
18July 38 am MST400.1600
19July 32 pm MST35Post-tropical
Total   8.1475
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1July 2611 pm HST300
2July 275 am HST300
3July 2711 am HST300
4July 275 pm HST350.1225
5July 2711 pm HST450.2025
6July 285 am HST650.4225
7July 2811 am HST650.4225
8July 285 pm HST750.5625
9July 2811 pm HST1001.0000
10July 295 am HST1101.2100
11July 2911 am HST1101.2100
12July 295 pm HST1001.0000
13July 2911 pm HST900.8100
14July 305 am HST650.4225
15July 3011 am HST550.3025
16July 305 pm HST450.2025
17July 3011 pm HST450.2025
18July 315 am HST450.2025
19July 3111 am HST450.2025
20July 315 pm HST450.2025
21July 3111 pm HST400.1600
22August 15 am HST350.1225
23August 111 am HST350.1225
24August 15 pm HST300
Total   9.105
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1July 285 am HST300
2July 2811 am HST350.1225
3July 285 pm HST350.1225
4July 2811 pm HST350.1225
5July 295 am HST350.1225
6July 2911 am HST350.1225
7July 295 pm HST350.1225
8July 2911 pm HST350.1225
9July 305 am HST350.1225
10July 3011 am HST30Remnant
Total   0.98
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1July 3011 pm HST400.1600
2July 315 am HST450.2025
3July 3111 am HST450.2025
4July 315 pm HST500.2500
5July 3111 pm HST550.3025
6August 15 am HST550.3025
7August 111 am HST600.3600
8August 15 pm HST650.4225
9August 111 pm HST650.4225
10August 25 am HST600.3600
11August 211 am HST600.3600
12August 25 pm HST550.3025
13August 211 pm HST500.2500
14August 35 am HST45Post-Tropical
Total   3.8975

Eastern Pacific

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Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1August 311 pm HST300
2August 45 am HST300
3August 411 am HST400.1600
4August 45 pm HST450.2025
5August 411 pm HST450.2025
6August 55 am HST450.2025
7August 511 am HST450.2025
8August 55 pm HST450.2025
9August 511 pm HST450.2025
10August 65 am HST450.2025
11August 611 am HST450.2025
12August 65 pm HST450.2025
13August 611 pm HST400.1600
14August 75 am HST450.2025
15August 711 am HST400.1600
16August 75 pm HST350.1225
Total   2.6275

Central Pacific

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Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
17August 711 pm HST350.1225
18August 85 am HST350.1225
19August 811 am HST30Post-tropical
20August 85 pm HST300
21August 811 pm HST300
22August 95 am HST300
23August 911 am HST350.1225
24August 95 pm HST350.1225
25August 911 pm HST350.1225
26August 105 am HST500.2500
27August 1011 am HST700.4900
28August 105 pm HST700.4900
29August 1011 pm HST700.4900
30August 115 am HST750.5625
31August 1111 am HST750.5625
32August 115 pm HST700.4900
33August 1111 pm HST650.4225
34August 125 am HST600.3600
35August 1211 am HST550.3025
36August 125 pm HST450.2025
37August 1211 pm HST35Remnants
Total   5.235
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1August 63 pm CST350.1225
2August 69 pm CST350.1225
3August 73 am CST350.1225
4August 79 am CST400.1600
5August 73 pm CST500.2500
6August 78 pm MST500.2500
7August 82 am MST500.2500
8August 88 pm MST500.2500
9August 82 pm MST550.3025
10August 88 pm MST550.3025
11August 92 am MST500.2500
12August 98 pm MST500.2500
13August 92 pm MST450.2025
14August 98 pm MST450.2025
15August 102 am MST350.1225
16August 108 am MST350.1225
17August 102 pm MST350.1225
18August 108 pm MST300
19August 112 am MST300
20August 118 am MST25Remnants
Total   3.405
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1August 242 pm MST300
2August 248 pm MST300
3August 252 am MST350.1225
4August 258 am MST400.1600
5August 252 pm MST500.2500
6August 258 pm PDT550.3025
7August 262 am PDT550.3025
8August 268 am PDT600.3600
9August 262 pm PDT550.3025
10August 268 pm PDT550.3025
11August 272 am PDT450.2025
12August 278 am PDT450.2025
13August 272 pm PDT400.1600
14August 278 pm PDT400.1600
15August 282 am PDT30Remnants
Total   2.8275

Eastern Pacific

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Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1August 3011 pm HST300
2August 315 am HST350.1225
3August 3111 am HST350.1225
4August 315 pm HST400.1600
5August 3111 pm HST400.1600
6September 15 am HST500.2500
7September 111 am HST550.3025
8September 15 pm HST550.3025
9September 111 pm HST650.4225
10September 25 am HST750.5625
11September 211 am HST850.7225
12September 25 pm HST900.8100
13September 211 pm HST900.8100
14September 35 am HST950.9025
15September 311 am HST1151.3225
16September 35 pm HST1251.5625
17September 311 pm HST1251.5625
18September 45 am HST1151.3225
19September 411 am HST1151.3225
20September 45 pm HST1101.2100
21September 411 pm HST1101.2100
22September 55 am HST1001.0000
23September 511 am HST1151.3225
24September 55 pm HST1201.4000
25September 511 pm HST1201.4000
Total   21.285

Central Pacific

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Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
26September 65 am HST1151.3225
27September 611 am HST1051.1025
28September 65 pm HST1201.4000
29September 611 pm HST1101.2100
30September 75 am HST1001.0000
31September 711 am HST950.9025
32September 75 pm HST900.8100
33September 711 pm HST850.7225
34September 85 am HST750.5625
35September 811 am HST750.5625
36September 85 pm HST650.4225
37September 811 pm HST500.2500
38September 95 am HST400.1600
39September 911 am HST350.1225
40September 95 pm HST350.1225
41September 911 pm HST350.1225
42September 105 am HST350.1225
Total   10.9175
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1September 19 pm CST300
2September 22 am MST300
3September 28 am MST400.1600
4September 22 pm MST450.2025
5September 28 pm MST550.3025
6September 32 am MST650.4225
7September 38 am MST700.4900
8September 32 pm MST700.4900
9September 38 pm MST750.5625
10September 42 am MST700.4900
11September 48 am MST600.3600
12September 42 pm MST450.2025
13September 48 pm MST400.1600
14September 52 am MST30Remnants
Total   3.8425
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1September 113 pm CST300
2September 119 am CST300
3September 123 am CST300
4September 129 am CST350.1225
5September 123 pm CST350.1225
6September 129 pm CST300
7September 1312 am CST25Remnants
8September 148 am MST350.1225
9September 142 pm CST400.1600
10September 148 pm MST400.1600
11September 152 am CST500.2500
12September 158 am MST500.2500
13September 152 pm CST550.3025
14September 158 pm MST500.2500
15September 162 am CST450.2025
16September 158 am MST400.1600
17September 162 pm CST300
Total   2.1025
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1September 213 pm CST350.1225
2September 219 pm CST350.1225
3September 223 am CST400.1600
4September 229 am CST450.2025
5September 223 pm CST500.2500
6September 229 pm CST550.3025
7September 232 am MST600.3600
8September 238 am MST750.5625
9September 232 pm MST750.5625
10September 238 pm MST850.7225
11September 242 am MST900.8100
12September 248 am MST900.8100
13September 242 pm MST850.7225
14September 248 pm MST800.6400
15September 252 am MST800.6400
16September 258 am PDT800.6400
17September 252 pm PDT800.6400
18September 258 pm PDT800.6400
19September 262 am PDT800.6400
20September 268 am PDT800.6400
21September 262 pm PDT800.6400
22September 268 pm PDT800.6400
23September 272 am PDT800.6400
24September 278 am PDT800.6400
25September 272 pm PDT700.4900
26September 278 pm PDT600.3600
27September 282 am PDT500.2500
28September 288 am PDT450.2025
29September 282 pm PDT350.1225
30September 288 pm PDT30Remnants
Total   13.925
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1September 302 am MST300
2September 308 am MST350.1225
3September 302 pm MST400.1600
4September 308 pm MST400.1600
5October 12 am MST500.2500
6October 18 am MST550.3025
7October 12 pm MST550.3025
8October 18 pm PDT550.3025
9October 22 am PDT550.3025
10October 28 am PDT550.3025
11October 22 pm PDT500.2500
12October 28 pm PDT500.2500
13October 32 am PDT450.2025
14October 38 am PDT450.2025
15October 32 pm PDT500.2500
16October 38 pm PDT500.2500
17October 42 am PDT450.2025
18October 48 am PDT500.2500
19October 42 pm PDT550.3025
20October 48 pm PDT550.3025
21October 52 am PDT600.3600
22October 58 am PDT700.4900
23October 52 pm PDT700.4900
24October 58 pm PDT750.5625
25October 62 am PDT600.3600
26October 68 am PDT550.3025
27October 62 pm PDT450.2025
28October 68 pm PDT450.2025
29October 72 am PDT450.2025
30October 78 am PDT450.2025
31October 72 pm PDT400.1600
32October 78 pm PDT400.1600
33October 82 am PDT350.1225
34October 88 am PDT350.1225
35October 82 pm PDT400.1600
36October 88 pm PDT400.1600
37October 92 am PDT350.1225
38October 98 am PDT30Post-Tropical
Total   9.05
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1October 42 pm MST400.1600
2October 48 pm MST400.1600
3October 52 am MST550.3025
4October 58 am MST550.3025
5October 52 pm MST600.3600
6October 58 pm MST650.4225
7October 62 am MST750.5625
8October 68 am MST750.5625
9October 62 pm MST750.5625
10October 68 pm MST750.5625
11October 72 am MST850.7225
12October 78 am MST950.9025
13October 72 pm MST950.9025
14October 78 pm MST900.8100
15October 82 am MST850.7225
16October 88 am MST650.4225
17October 82 pm MST600.3600
18October 88 pm MST500.2500
19October 92 am MST450.2025
20October 98 am MST400.1600
21October 92 pm MST400.1600
22October 98 pm PDT450.2025
23October 102 am PDT450.2025
24October 108 am PDT400.1600
25October 102 pm PDT30Remnant
Total   10.1375
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1October 99 am CST300
2October 93 pm CST400.1600
3October 99 pm CST400.1600
4October 103 am CST500.2500
5October 109 am CST500.2500
6October 102 pm MST450.2025
7October 108 pm MST450.2025
8October 112 am MST400.1600
9October 118 am MST350.1225
10October 112 pm MST30
11October 118 pm MST25Post-tropical
Total   1.5075
Adv. Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
1October 242 pm PDT30
2October 248 pm PDT30
3October 252 am PDT350.1225
4October 258 am PDT450.2025
5October 252 pm PDT450.2025
6October 258 pm PDT450.2025
7October 262 am PDT450.2025
8October 268 am PDT450.2025
9October 262 pm PDT400.1600
10October 268 pm PDT400.1600
11October 272 am PDT400.1600
12October 278 am PDT400.1600
13October 272 pm PDT350.1225
14October 278 pm PDT350.1225
15October 282 am PDT400.1600
16October 288 am PDT400.1600
17October 282 pm PDT350.1225
18October 288 pm PDT350.1225
Total   2.585

Best track (Tropical Cyclone Reports)

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Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
May 2818:00 UTC300
May 2900:00 UTC300
May 2906:00 UTC300
May 2912:00 UTC400.1600
May 2918:00 UTC500.2500
May 3000:00 UTC500.2500
May 3006:00 UTC450.2025
May 3012:00 UTC450.2025
May 3018:00 UTC450.2025
May 3100:00 UTC400.1600
May 3106:00 UTC350.1225
May 3112:00 UTC300
May 3118:00 UTC300
June 100:00 UTC250
June 106:00 UTC250
June 112:00 UTC Dissipated
Total  1.55
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
June 806:00 UTC400.1600
June 812:00 UTC500.2500
June 818:00 UTC500.2500
June 900:00 UTC600.3600
June 906:00 UTC650.4225
June 912:00 UTC650.4225
June 918:00 UTC650.4225
June 1000:00 UTC600.3600
June 1006:00 UTC500.2500
June 1012:00 UTC450.2025
June 1018:00 UTC35Remnant low
Total  3.1
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
June 806:00 UTC300
June 812:00 UTC350.1225
June 818:00 UTC400.1600
June 900:00 UTC400.1600
June 906:00 UTC450.2025
June 912:00 UTC550.3025
June 918:00 UTC600.3600
June 1000:00 UTC600.3600
June 1006:00 UTC600.3600
June 1012:00 UTC600.3600
June 1018:00 UTC500.2500
June 1100:00 UTC40Remnants
Total  2.6375
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
June 1312:00 UTC300
June 1318:00 UTC350.1225
June 1400:00 UTC400.1600
June 1406:00 UTC450.2025
June 1412:00 UTC500.2500
June 1418:00 UTC550.3025
June 1500:00 UTC550.3025
June 1506:00 UTC550.3025
June 1512:00 UTC500.2500
June 1518:00 UTC400.1600
June 1600:00 UTC35Remnants
Total  2.0525
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
June 2906:00 UTC250
June 2912:00 UTC300
June 2918:00 UTC350.1225
June 3000:00 UTC350.1225
June 3006:00 UTC400.1600
June 3012:00 UTC450.2025
June 3018:00 UTC550.3025
July 100:00 UTC650.4225
July 106:00 UTC700.4900
July 112:00 UTC800.6400
July 118:00 UTC950.9025
July 200:00 UTC1001.0000
July 206:00 UTC1051.1025
July 212:00 UTC1001.0000
July 218:00 UTC950.9025
July 300:00 UTC850.7225
July 306:00 UTC700.4900
July 312:00 UTC500.2500
July 318:00 UTC40Remnant low
Total  8.8325
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
July 3100:00 UTC350.1225
July 3106:00 UTC400.1600
July 3112:00 UTC450.2025
July 3118:00 UTC500.2500
August 100:00 UTC550.3025
August 106:00 UTC550.3025
August 112:00 UTC550.3025
August 118:00 UTC600.3600
August 200:00 UTC650.4225
August 206:00 UTC650.4225
August 212:00 UTC650.4225
August 218:00 UTC600.3600
August 300:00 UTC550.3025
August 306:00 UTC500.2500
August 312:00 UTC45Remnant low
Total  4.1825
Date Time Maximum Sustained Winds (kt) ACE (104 kt2)
August 2418:00 UTC300
August 2500:00 UTC300
August 2506:00 UTC350.1225
August 2512:00 UTC400.1600
August 2518:00 UTC500.2500
August 2600:00 UTC550.3025
August 2606:00 UTC600.3600
August 2612:00 UTC600.3600
August 2618:00 UTC550.3025
August 2700:00 UTC550.3025
August 2706:00 UTC500.2500
August 2712:00 UTC450.2025
August 2718:00 UTC400.1600
August 2800:00 UTC400.1600
August 2806:00 UTC35Remnant low
Total  2.9325

Totals

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StormTypeACE (104 kt2)
01E (Alvin) Best track 1.55
02E (Barbara) Best track 3.1
03E (Cosme) Best track 2.6375
04E (Dalila) Best track 2.0525
05E (Erick) Operational 5.8775
06E (Flossie) Best track 8.8325
01C (Iona) Operational 0
(9.105)
02C (Keli) Operational 0
(0.9800)
07E (Gil) Best track 4.1825
08E (Henriette) Operational 2.6275
(5.235)
09E (Ivo) Operational 3.405
10E (Juliette) Best track 2.9325
11E (Kiko) Operational 21.285
(10.9175)
12E (Lorena) Operational 3.8425
13E (Mario) Operational 2.1025
14E (Narda) Operational 13.8025
15E (Octave) Operational 9.0500
16E (Priscilla) Operational 10.1375
17E (Raymond) Operational 1.5075
18E (Sonia) Operational 2.5850
Total101.51
(26.2375)

References

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  1. Stacy R. Stewart (January 6, 2006). Tropical Storm Zeta Discussion Number 30 (Report). National Hurricane Center. Retrieved May 17, 2020.