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
Total
3.7275
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 Total 7.345
References