ACE per Storm

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HurakaYoshi
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ACE per Storm

#1 Postby HurakaYoshi » Sat Mar 25, 2023 6:01 pm

So a few months ago, I looked at the ACE per Storm (counting unnamed). Out of both NATL and EPAC (1971-present), the three seasons with the highest ACE/storm are:

North Atlantic
1. 2004 (15.12)*
2. 1999 (14.70)- Five of the twelve storms became C4s
3. 2017 (13.22)- Featured ten consecutive hurricanes (though Harvey and Lee became one after reforming)

East Pacific
1. 2018 (13.83)- EPAC had the highest recorded ACE that year
2. 1993 (13.45)
3. 1991 (12.88)

Additionally the three seasons with the lowest rations are:

North Atlantic
1. 2013 (2.57)- That season also had more storms compared to other seasons below 40-50 ACE (i.e. 1994)
2. 1977 (4.21)
3. 1983 (4.35)- Only four storms formed that year

East Pacific
1. 1977 (2.78)- Lowest recorded ACE in the EPAC
2. 2003 (3.53)
3. 2013 (3.74)- Only one major formed that year

Interestingly, 1977 and 2013 seasons appear in the bottom three for both seasons.
Any thoughts?

Notes
*As stated above, I looked at the years between 1971 and now. However, 1961 had the highest ACE per storm.
- Also, I truncated the values after the hundredth place
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WalterWhite
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Re: ACE per Storm

#2 Postby WalterWhite » Sat Mar 25, 2023 6:04 pm

Active seasons tend to have more favorable conditions. These favorable conditions allow storms to become stronger, boosting the ACE/storm.
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Re: ACE per Storm

#3 Postby NotSparta » Sat Mar 25, 2023 6:19 pm

HurakaYoshi wrote:So a few months ago, I looked at the ACE per Storm (counting unnamed). Out of both NATL and EPAC (1971-present), the three seasons with the highest ACE/storm are:

North Atlantic
1. 2004 (15.12)*
2. 1999 (14.70)- Five of the twelve storms became C4s
3. 2017 (13.22)- Featured ten consecutive hurricanes (though Harvey and Lee became one after reforming)

East Pacific
1. 2018 (13.83)- EPAC had the highest recorded ACE that year
2. 1993 (13.45)
3. 1991 (12.88)

Additionally the three seasons with the lowest rations are:

North Atlantic
1. 2013 (2.57)- That season also had more storms compared to other seasons below 40-50 ACE (i.e. 1994)
2. 1977 (4.21)
3. 1983 (4.35)- Only four storms formed that year

East Pacific
1. 1977 (2.78)- Lowest recorded ACE in the EPAC
2. 2003 (3.53)
3. 2013 (3.74)- Only one major formed that year

Interestingly, 1977 and 2013 seasons appear in the bottom three for both seasons.
Any thoughts?

Notes
*As stated above, I looked at the years between 1971 and now. However, 1961 had the highest ACE per storm.
- Also, I truncated the values after the hundredth place



1977 and 2013 were both globally pretty suppressed
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Re: ACE per Storm

#4 Postby Teban54 » Sat Mar 25, 2023 8:17 pm

WalterWhite wrote:Active seasons tend to have more favorable conditions. These favorable conditions allow storms to become stronger, boosting the ACE/storm.

But on the other hand, active seasons may allow more storms to form in otherwise marginally favorable conditions, thus peaking as TS/C1 and not generating much ACE. While it's easy to think of their "weak" peak intensity as indications of unfavorable conditions, they are storms that would have not formed at all in less active years.

Yes, I wrote this specifically with 2005 and 2020 in mind.
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WalterWhite
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Re: ACE per Storm

#5 Postby WalterWhite » Sat Mar 25, 2023 8:28 pm

Teban54 wrote:
WalterWhite wrote:Active seasons tend to have more favorable conditions. These favorable conditions allow storms to become stronger, boosting the ACE/storm.

But on the other hand, active seasons may allow more storms to form in otherwise marginally favorable conditions, thus peaking as TS/C1 and not generating much ACE. While it's easy to think of their "weak" peak intensity as indications of unfavorable conditions, they are storms that would have not formed at all in less active years.

Yes, I wrote this specifically with 2005 and 2020 in mind.


On the other hand, seasons with super unfavorable conditions might not allow ANY (or more likely very few) of its storms to reach high wind speeds. (I am looking at you, 2013.)
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Re: ACE per Storm

#6 Postby HurakaYoshi » Mon Mar 27, 2023 8:22 am

Teban54 wrote:
WalterWhite wrote:Active seasons tend to have more favorable conditions. These favorable conditions allow storms to become stronger, boosting the ACE/storm.

But on the other hand, active seasons may allow more storms to form in otherwise marginally favorable conditions, thus peaking as TS/C1 and not generating much ACE. While it's easy to think of their "weak" peak intensity as indications of unfavorable conditions, they are storms that would have not formed at all in less active years.

Yes, I wrote this specifically with 2005 and 2020 in mind.

2012 could also be an example, albeit with fewer storms. Only two majors formed during that season, yet both peaked at 100 kt. 2021 may be too as only 7 hurricanes formed out of 21 storms (though we got four majors).
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Re: ACE per Storm

#7 Postby Category5Kaiju » Mon Mar 27, 2023 8:27 am

Also, take into consideration that you could very well have a season that is inactive overall but features one storm that accrues a very large number of ACE. For instance, 1899 with the Puerto Rico hurricane, 1957 with Carrie, and 1966 with Inez.
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Re: ACE per Storm

#8 Postby AJC3 » Tue Mar 28, 2023 10:08 pm

A few years ago, I did acomprehensive seasonal listing of this paramater, which I shortened to "ACEPNS" I need to update my list at home to include 2022 (I think my list at home was updated through 2021), plus any adjustments to seasonal ACE and NS totals for any re-analyses that may have been performed.

 https://twitter.com/WxmanTony/status/1330100969657544705


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