This is the page for calculating the Accumulated cyclone energy for the 2017 Atlantic 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 v max is estimated sustained wind speed in knots.
Operational (Advisories)
Adv.
Date
Time
Maximum Sustained Winds (kt)
ACE (104 kt2 )
1
19 April
11 am AST
30
0
2
19 April
5 pm AST
30
0
3
19 April
11 pm AST
30
0
4
20 April
5 am AST
30
0
5
20 April
11 am AST
30
0
6
20 April
5 pm AST
40
0.1600
7
20 April
11 pm AST
45
0.2025
8
21 April
5 am AST
45
0.2025
9
21 April
11 am AST
45
Post-trop.
Total
0.565
Adv.
Date
Time
Maximum Sustained Winds (kt)
ACE (104 kt2 )
1
18 June
5 pm AST
30
Potential TC
2
18 June
11 pm AST
35
Potential TC
3
19 June
5 am AST
35
Potential TC
4
19 June
11 am AST
35
Potential TC
5
19 June
5 pm AST
35
0.1225
6
19 June
11 pm AST
35
0.1225
7
20 June
5 am AST
35
0.1225
8
20 June
11 am AST
40
0.1600
9
20 June
5 pm AST
35
Open wave
Total
0.5275
Adv.
Date
Time
Maximum Sustained Winds (kt)
ACE (104 kt2 )
1
19 June
4 pm CDT
35
Potential TC
2
19 June
10 pm CDT
35
Potential TC
3
20 June
4 am CDT
35
Potential TC
4
20 June
10 am CDT
35
Potential TC
5
20 June
4 pm CDT
40
0.1600
6
20 June
10 pm CDT
50
0.2500
7
21 June
4 am CDT
50
0.2500
8
21 June
10 am CDT
45
0.2025
9
21 June
4 pm CDT
45
0.2025
10
21 June
10 pm CDT
45
0.2025
11
22 June
4 am CDT
35
0.1225
12
22 June
10 am CDT
30
0
13
22 June
5 pm EDT
20
0
14
22 June
11 pm EDT
15
0
15
23 June
5 am EDT
15
0
16
23 June
11 am EDT
30
0
17
23 June
5 pm EDT
20
Post-trop.
18
23 June
11 pm EDT
15
Post-trop.
19
24 June
5 am EDT
20
Post-trop.
20
24 June
11 am EDT
-
Dissipated
Total
1.39
Adv.
Date
Time
Maximum Sustained Winds (kt)
ACE (104 kt2 )
1
17 July
5 pm AST
35
0.1225
2
17 July
11 pm AST
40
0.1600
3
18 July
5 am AST
45
0.2025
4
18 July
11 am AST
35
0.1225
5
18 July
5 pm AST
35
0.1225
Total
0.73
Adv.
Date
Time
Maximum Sustained Winds (kt)
ACE (104 kt2 )
1
31 July
6 am EDT
30
special
2
31 July
8 am EDT
40
special
3
31 July
11 am EDT
40
0.1600
4
31 July
5 pm EDT
30
-
5
31 July
11 pm EDT
25
-
6
1 Aug
5 am EDT
25
-
7
1 Aug
11 am EDT
25
-
8
1 Aug
5 am EDT
30
-
9
1 Aug
11 am EDT
30
Post-trop.
Total
0.16
Adv.
Date
Time
Maximum Sustained Winds (kt)
ACE (104 kt2 )
1
6 August
5 pm EDT
30
Potential TC
2
6 August
11 pm EDT
35
0.1225
3
7 August
5 am EDT
40
0.1600
4
7 August
10 am CDT
50
0.2500
5
7 August
4 pm CDT
50
0.2500
6
7 August
10 pm CDT
50
0.2500
7
8 August
4 am CDT
45
0.2025
8
8 August
10 am CDT
40
0.1600
9
8 August
4 pm CDT
35
0.1225
10
8 August
10 pm CDT
45
0.2025
11
9 August
4 am CDT
55
0.3025
12
9 August
10 am CDT
60
0.3600
13
9 August
4 pm CDT
65
0.4225
14
9 August
10 pm CDT
75
0.5625
15
10 August
4 am CDT
60
0.3600
16
10 August
10 am CDT
25
Dissipated
Total
3.7275
Adv.
Date
Time
Maximum Sustained Winds (kt)
ACE (104 kt2 )
1
12 August
11 pm EDT
30
0
2
13 August
5 am EDT
30
0
3
13 August
11 am EDT
30
0
4
13 August
5 pm EDT
35
0.1225
5
13 August
11 pm EDT
40
0.1600
6
14 August
5 am EDT
40
0.1600
7
14 August
11 am EDT
50
0.2500
8
14 August
5 pm EDT
60
0.3600
9
14 August
11 pm EDT
65
0.4225
10
15 August
5 am EDT
65
0.4225
11
15 August
11 am EDT
65
0.4225
12
15 August
5 pm EDT
70
0.4900
13
15 August
11 pm EDT
75
0.5625
14
16 August
5 am AST
80
0.6400
15
16 August
11 am AST
80
0.6400
16
16 August
5 pm AST
85
0.7225
17
16 August
11 pm AST
90
0.8100
18
17 August
5 am AST
85
0.7225
19
17 August
11 am AST
70
0.4900
20
17 August
5 pm AST
55
Extratropical
Total
7.3975
Adv.
Date
Time
Maximum Sustained Winds (kt)
ACE (104 kt2 )
1
17 August
11 am AST
30
Potential TC
2
17 August
5 pm AST
35
0.1225
3
17 August
11 pm AST
35
0.1225
4
18 August
5 am AST
35
0.1225
5
18 August
11 am AST
35
0.1225
6
18 August
5 pm AST
35
0.1225
7
18 August
11 pm AST
35
0.1225
8
19 August
5 am AST
35
0.1225
9
19 August
11 am AST
35
0.1225
10
19 August
5 pm EDT
30
0
11
19 August
11 pm EDT
30
Dissipated
Between 11pm EDT 19 August and 10am CDT 23 August, the system was a tropical wave, not a tropical cyclone.
12
23 August
10 am CDT
30
0
13
23 August
4 pm CDT
30
0
14
23 August
10 pm CDT
30
0
15
24 August
4 am CDT
40
0.1600
16
24 August
10 am CDT
55
0.3025
17
24 August
1 pm CDT
75
Special
18
24 August
4 pm CDT
75
0.5625
19
24 August
10 pm CDT
75
0.5625
20
25 August
4 am CDT
90
0.8100
21
25 August
10 am CDT
95
0.9025
22
25 August
4 pm CDT
110
1.2100
23
25 August
10 pm CDT
115
1.3225
24
26 August
4 am CDT
85
0.7225
25
26 August
10 am CDT
65
0.4225
26
26 August
4 pm CDT
55
0.3025
27
26 August
10 pm CDT
45
0.2025
28
27 August
4 am CDT
40
0.1600
29
27 August
10 am CDT
35
0.1225
30
27 August
4 pm CDT
35
0.1225
31
27 August
10 pm CDT
35
0.1225
32
28 August
4 am CDT
35
0.1225
33
28 August
10 am CDT
35
0.1225
34
28 August
4 pm CDT
40
0.1600
35
28 August
10 pm CDT
40
0.1600
36
29 August
4 am CDT
40
0.1600
37
29 August
10 am CDT
40
0.1600
38
29 August
4 pm CDT
45
0.2025
39
29 August
10 pm CDT
45
0.2025
40
30 August
4 am CDT
40
0.1600
41
30 August
10 am CDT
40
0.1600
42
30 August
4 pm CDT
35
0.1225
Total
10.7225
Adv.
Date
Time
Maximum Sustained Winds (kt)
ACE (104 kt2 )
1
30 August
11 am AST
45
0.2025
2
30 August
5 pm AST
50
0.2500
3
30 August
11 pm AST
55
0.3025
4
31 August
5 am AST
60
0.3600
5
31 August
11 am AST
85
0.7225
6
31 August
5 pm AST
100
1.0000
7
31 August
11 pm AST
100
1.0000
8
1 September
5 am AST
100
1.0000
9
1 September
11 am AST
95
0.9025
10
1 September
5 pm AST
105
1.1025
11
1 September
11 pm AST
100
1.0000
12
2 September
5 am AST
95
0.9025
13
2 September
11 am AST
95
0.9025
14
2 September
5 pm AST
95
0.9025
15
2 September
11 pm AST
95
0.9025
16
3 September
5 am AST
100
1.0000
17
3 September
11 am AST
100
1.0000
18
3 September
5 pm AST
100
1.0000
19
3 September
11 pm AST
100
1.0000
20
4 September
5 am AST
100
1.0000
21
4 September
11 am AST
105
1.1025
22
4 September
5 pm AST
115
1.3225
23
4 September
11 pm AST
120
1.4400
24
5 September
5 am AST
130
1.6900
25
5 September
8 am AST
150
Special
26
5 September
11 am AST
155
2.4025
27
5 September
5 pm AST
160
2.5600
28
5 September
11 pm AST
160
2.5600
29
6 September
5 am AST
160
2.5600
30
6 September
11 am AST
160
2.5600
31
6 September
5 pm AST
160
2.5600
32
6 September
11 pm AST
160
2.5600
33
7 September
5 am AST
155
2.4025
34
7 September
11 am AST
150
2.2500
35
7 September
5 pm AST
150
2.2500
36
7 September
11 pm AST
145
2.1025
37
8 September
5 am EDT
135
1.8225
38
8 September
11 am EDT
130
1.6900
39
8 September
5 am EDT
135
1.8225
40
8 September
11 pm EDT
140
1.9600
41
9 September
5 am EDT
135
1.8225
42
9 September
11 am EDT
110
1.2100
43
9 September
5 pm EDT
110
1.2100
44
9 September
11 pm EDT
105
1.1025
Total
61.415
Adv.
Date
Time
Maximum Sustained Winds (kt)
ACE (104 kt2 )
1
5 September
11 am AST
35
0.1225
2
5 September
5 pm AST
40
0.1600
3
5 September
11 pm AST
45
0.2025
4
6 September
5 am AST
50
0.2500
5
6 September
11 am AST
60
0.3600
6
6 September
5 pm AST
65
0.4225
7
6 September
11 pm AST
75
0.5625
8
7 September
5 am AST
80
0.6400
9
7 September
11 am AST
80
0.6400
10
7 September
5 pm AST
105
1.1025
11
7 September
11 pm AST
105
1.1025
12
8 September
5 am AST
110
1.2100
13
8 September
11 am AST
130
1.6900
14
8 September
5 pm AST
130
1.6900
15
8 September
11 pm AST
135
1.8225
16
9 September
5 am AST
130
1.6900
17
9 September
11 am AST
125
1.5625
18
9 September
5 pm AST
125
1.5625
19
9 September
11 pm AST
115
1.3225
Total
18.115
Adv.
Date
Time
Maximum Sustained Winds (kt)
ACE (104 kt2 )
1
5 September
4 pm CDT
30
0
2
5 September
10 pm CDT
30
0
3
6 September
4 am CDT
35
0.1225
4
6 September
10 am CDT
40
0.1600
5
6 September
4 pm CDT
65
0.4225
6
6 September
10 pm CDT
70
0.4900
7
7 September
4 am CDT
70
0.4900
8
7 September
10 am CDT
70
0.4900
9
7 September
4 pm CDT
70
0.4900
10
7 September
10 pm CDT
75
0.5625
11
8 September
4 am CDT
80
0.6400
12
8 September
10 am CDT
85
0.7225
13
8 September
4 pm CDT
90
0.8100
14
8 September
10 pm CDT
65
0.4225
15
8 September
4 am CDT
35
0.1225
16
8 September
10 am CDT
30
Dissipated
Total
5.945
Best Track (Tropical Cyclone Reports)
Date
Time
Maximum Sustained Winds (kt)
ACE (104 kt2 )
16 April
0600 UTC
55
Extratrop.
16 April
1200 UTC
55
Extratrop.
16 April
1800 UTC
55
Extratrop.
17 April
0000 UTC
50
Extratrop.
17 April
0600 UTC
45
Extratrop.
17 April
1200 UTC
45
Extratrop.
17 April
1800 UTC
45
Extratrop.
18 April
0000 UTC
40
Extratrop.
18 April
0600 UTC
35
Extratrop.
18 April
1200 UTC
35
Extratrop.
18 April
1800 UTC
30
Extratrop.
19 April
0000 UTC
30
0
19 April
0600 UTC
30
0
19 April
1200 UTC
30
0
19 April
1800 UTC
30
0
20 April
0000 UTC
30
0
20 April
0600 UTC
35
0.1225
20 April
1200 UTC
35
0.1225
20 April
1800 UTC
40
0.1600
21 April
0000 UTC
45
0.2025
21 April
0600 UTC
45
0.2025
21 April
1200 UTC
45
Extratrop.
21 April
1800 UTC
40
Extratrop.
22 April
0000 UTC
40
Extratrop.
22 April
0600 UTC
40
Extratrop.
22 April
1200 UTC
35
Extratrop.
22 April
1800 UTC
30
Extratrop.
Total
0.81
Season total
Storm Type ACE (104 kt2 ) 01L (Arlene) Best Track 0.8100 02L (Bret) Operational 0.5275 03L (Cindy) Operational 1.3900 05L (Don) Operational 0.7300 06L (Emily) Operational 0.1600 07L (Franklin) Operational 3.7275 08L (Gert) Operational 7.3975 09L (Harvey) Operational 10.7225 11L (Irma) Operational 61.4150 12L (Jose) Operational 18.1150 13L (Katia) Operational 5.9450 Total 110.94
References