2025 NATL hurricane season is here

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LarryWx
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Re: 2025 NATL hurricane season is here

#201 Postby LarryWx » Sun Sep 21, 2025 2:01 pm

Category5Kaiju wrote:
ConvergenceZone wrote:
Category5Kaiju wrote:Personally I'm quite interested to see what October and November will produce. While it's definitely not something I'd expect by default, it's also intriguing to think back at -ENSO seasons such as 1998, 1999, 2005, 2008, and 2020. Back during those Septembers, who would've thought that a destructive Category 4 or higher hurricane would've formed during the late months? And, in the extreme case of 1932, a November Category 5 hurricane?

2025's story has been tame so far. But will it be like this the next 70 days?


It may be just as likely to be just as quiet as it's been. It could just be one of those low activity years.


True, though unless something truly extraordinary happens (like a 2007/2021-style event), I'd imagine that the still-warm deep tropics, the -ENSO pattern (which would only progressively get stronger as we enter fall) that would theoretically reduce wind shear, and the general O/N climatology pattern of seeing CAG activity or sleeper waves that turn into something in the W. Atlantic would also serve to help produce activity in some fashion before the finish line.

In fact, perhaps what's going on in the WPAC may be interesting. There were theories going on with the idea that whatever hostile background conditions were plaguing the Atlantic somehow were also affecting the WPAC, with its dearth of powerful typhoons even in August and early September. Now that the WPAC managed to produce 2 super typhoons, maybe that may be a sign that such conditions are improving, or at least going to, in the future?


There’s almost certainly going to be activity in Oct+. Since 1921, only 1993, 1983, and 1960 had no ACE Oct+. Whether or not it will actually be relatively active vs climo is a totally different story though.
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Re: 2025 NATL hurricane season is here

#202 Postby Ubuntwo » Sun Sep 21, 2025 2:10 pm

Instability doesn't typically peak in the Atlantic until mid October. If the main inhibitor in the tropics has been stability, this should be gradually decrease in impact over the next month per climo.
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Re: 2025 NATL hurricane season is here

#203 Postby LarryWx » Sun Sep 21, 2025 2:13 pm

Ubuntwo wrote:Instability doesn't typically peak in the Atlantic until mid October. If the main inhibitor in the tropics has been stability, this should be gradually decrease in impact over the next month per climo.


Based on this season being relatively quiet so far and when considering the history of very active late seasons as I earlier posted, I think that the odds of a very active late season (Oct-Dec)(ACE of 50+) are <50%. But I wouldn’t bet more than I could afford to lose! But even if quiet it only takes one to make it bad.
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Re: 2025 NATL hurricane season is here

#204 Postby WeatherBoy2000 » Sun Sep 21, 2025 2:23 pm

LarryWx wrote:
Category5Kaiju wrote:
ConvergenceZone wrote:
It may be just as likely to be just as quiet as it's been. It could just be one of those low activity years.


True, though unless something truly extraordinary happens (like a 2007/2021-style event), I'd imagine that the still-warm deep tropics, the -ENSO pattern (which would only progressively get stronger as we enter fall) that would theoretically reduce wind shear, and the general O/N climatology pattern of seeing CAG activity or sleeper waves that turn into something in the W. Atlantic would also serve to help produce activity in some fashion before the finish line.

In fact, perhaps what's going on in the WPAC may be interesting. There were theories going on with the idea that whatever hostile background conditions were plaguing the Atlantic somehow were also affecting the WPAC, with its dearth of powerful typhoons even in August and early September. Now that the WPAC managed to produce 2 super typhoons, maybe that may be a sign that such conditions are improving, or at least going to, in the future?


There’s almost certainly going to be activity in Oct+. Since 1921, only 1993, 1983, and 1960 had no ACE Oct+. Whether or not it will actually be relatively active vs climo is a totally different story though.


At this point, Gabrielle is going to be designated as 2025's second hurricane very soon (Best track says it's a hurricane now). I think we're in for 2-4 more hurricanes, with one or two of them becoming majors. Due to the more active tendency of recent late seasons and the -enso, I think we'll at least have an average late season.
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Re: 2025 NATL hurricane season is here

#205 Postby LarryWx » Sun Sep 21, 2025 2:34 pm

WeatherBoy2000 wrote:
LarryWx wrote:
Category5Kaiju wrote:
True, though unless something truly extraordinary happens (like a 2007/2021-style event), I'd imagine that the still-warm deep tropics, the -ENSO pattern (which would only progressively get stronger as we enter fall) that would theoretically reduce wind shear, and the general O/N climatology pattern of seeing CAG activity or sleeper waves that turn into something in the W. Atlantic would also serve to help produce activity in some fashion before the finish line.

In fact, perhaps what's going on in the WPAC may be interesting. There were theories going on with the idea that whatever hostile background conditions were plaguing the Atlantic somehow were also affecting the WPAC, with its dearth of powerful typhoons even in August and early September. Now that the WPAC managed to produce 2 super typhoons, maybe that may be a sign that such conditions are improving, or at least going to, in the future?


There’s almost certainly going to be activity in Oct+. Since 1921, only 1993, 1983, and 1960 had no ACE Oct+. Whether or not it will actually be relatively active vs climo is a totally different story though.


At this point, Gabrielle is going to be designated as 2025's second hurricane very soon (Best track says it's a hurricane now). I think we're in for 2-4 more hurricanes, with one or two of them becoming majors. Due to the more active tendency of recent late seasons and the -enso, I think we'll at least have an average late season.


I agree that despite the quieter than avg pre-Oct, getting at least a near avg late season is a good bet to take. The 1991-2020 avg ACE is ~28 for Oct-Dec. But getting a 50ish ACE/very active late season will be much more difficult.
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Re: 2025 NATL hurricane season is here

#206 Postby Ubuntwo » Sun Sep 21, 2025 2:35 pm

LarryWx wrote:
Ubuntwo wrote:Instability doesn't typically peak in the Atlantic until mid October. If the main inhibitor in the tropics has been stability, this should be gradually decrease in impact over the next month per climo.


Based on this season being relatively quiet so far and when considering the history of very active late seasons as I earlier posted, I think that the odds of a very active late season (Oct-Dec)(ACE of 50+) are <50%. But I wouldn’t bet more than I could afford to lose! But even if quiet it only takes one to make it bad.

A drop in stability wouldn't be enough for a bombastic late season alone, but it might allow a more 'normal' level of tropical activity. Think 20-30 ACE. To push late season into very active territory, the season would need other factors to come into place. Something like good MJO timing, waves coming off at a higher latitude, no early intense Gulf frontal passages. All that is much harder to predict.
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Re: 2025 NATL hurricane season is here

#207 Postby LarryWx » Sun Sep 21, 2025 7:47 pm

Ubuntwo wrote:
LarryWx wrote:
Ubuntwo wrote:Instability doesn't typically peak in the Atlantic until mid October. If the main inhibitor in the tropics has been stability, this should be gradually decrease in impact over the next month per climo.


Based on this season being relatively quiet so far and when considering the history of very active late seasons as I earlier posted, I think that the odds of a very active late season (Oct-Dec)(ACE of 50+) are <50%. But I wouldn’t bet more than I could afford to lose! But even if quiet it only takes one to make it bad.

A drop in stability wouldn't be enough for a bombastic late season alone, but it might allow a more 'normal' level of tropical activity. Think 20-30 ACE. To push late season into very active territory, the season would need other factors to come into place. Something like good MJO timing, waves coming off at a higher latitude, no early intense Gulf frontal passages. All that is much harder to predict.


Today’s Euro Weeklies release fwiw is more active, especially in the S Gulf to NW Caribbean and including S and C FL, and is suggesting that a 50+ Oct-Nov ACE is a realistic possibility. I’ll continue to follow the EW trends.
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Re: 2025 NATL hurricane season is here

#208 Postby Category5Kaiju » Mon Sep 22, 2025 8:25 am

LarryWx wrote:
Ubuntwo wrote:
LarryWx wrote:
Based on this season being relatively quiet so far and when considering the history of very active late seasons as I earlier posted, I think that the odds of a very active late season (Oct-Dec)(ACE of 50+) are <50%. But I wouldn’t bet more than I could afford to lose! But even if quiet it only takes one to make it bad.

A drop in stability wouldn't be enough for a bombastic late season alone, but it might allow a more 'normal' level of tropical activity. Think 20-30 ACE. To push late season into very active territory, the season would need other factors to come into place. Something like good MJO timing, waves coming off at a higher latitude, no early intense Gulf frontal passages. All that is much harder to predict.


Today’s Euro Weeklies release fwiw is more active, especially in the S Gulf to NW Caribbean and including S and C FL, and is suggesting that a 50+ Oct-Nov ACE is a realistic possibility. I’ll continue to follow the EW trends.


We *might* actually be seeing a switch flip in real time, giving credence to that idea of a potentially busy October. A Category 3 hurricane is now active, with two AOIs having decent chances of developing. Maybe the season really wasn’t over after all. Almost like….something like this happened twice in two separate -ENSO years within the past 4 years. :lol:
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Re: 2025 NATL hurricane season is here

#209 Postby Travorum » Mon Sep 22, 2025 8:34 am

Image
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Re: 2025 NATL hurricane season is here

#210 Postby Teban54 » Mon Sep 22, 2025 8:49 am

Hmm....

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Re: 2025 NATL hurricane season is here

#211 Postby kevin » Mon Sep 22, 2025 9:19 am



Seems like the bell is ringing, just exactly one month later than is usually the case :lol:
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Re: 2025 NATL hurricane season is here

#212 Postby cycloneye » Mon Sep 22, 2025 9:22 am

Well, after being in the dead phase, it has awaken in a solid way and dont have to change the title. :D

psyclone
unless and until something happens it seems only reasonable that this thread title be updated to "2025 NATL hurricane non season is here.


I guess is not needed now.
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Re: 2025 NATL hurricane season is here

#213 Postby Teban54 » Mon Sep 22, 2025 1:56 pm


A 6/1/1 season can more plausibly be seen as "an inactive season except for a one-hit-wonder".

But a 7/2/2, with the two MHs both reaching Cat 4+? That's just bizarre.
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Re: 2025 NATL hurricane season is here

#214 Postby cycloneye » Mon Sep 22, 2025 1:58 pm

Teban54 wrote:

A 6/1/1 season can more plausibly be seen as "an inactive season except for a one-hit-wonder".

But a 7/2/2, with the two MHs both reaching Cat 4+? That's just bizarre.


And maybe one or two more MH before November 30?
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Re: 2025 NATL hurricane season is here

#215 Postby FireRat » Mon Sep 22, 2025 3:19 pm

LarryWx wrote:
Ubuntwo wrote:Instability doesn't typically peak in the Atlantic until mid October. If the main inhibitor in the tropics has been stability, this should be gradually decrease in impact over the next month per climo.


Based on this season being relatively quiet so far and when considering the history of very active late seasons as I earlier posted, I think that the odds of a very active late season (Oct-Dec)(ACE of 50+) are <50%. But I wouldn’t bet more than I could afford to lose! But even if quiet it only takes one to make it bad.


I have a feeling we're seeing the switch flip right now.
About the same time as it did in the WPAC too, with the powerful typhoons.
We might be in for a heck of a Fall. Maybe even into November.
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Re: 2025 NATL hurricane season is here

#216 Postby FireRat » Mon Sep 22, 2025 3:21 pm

Teban54 wrote:

A 6/1/1 season can more plausibly be seen as "an inactive season except for a one-hit-wonder".

But a 7/2/2, with the two MHs both reaching Cat 4+? That's just bizarre.


It really is bizarre, like 1992 or 1965 with an extra major haha. It's like when in a game of UNO you get a wacky hand having 5 simple cards and 2 Draw 4s :lol:
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Re: 2025 NATL hurricane season is here

#217 Postby Category5Kaiju » Mon Sep 22, 2025 4:14 pm

Rule 1 of tracking the tropics: "September Remember."

Rule 2 of tracking the tropics: "If you cancel the season at any point before fall rolls around, 99% of the time, you're going to be wrong."
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Re: 2025 NATL hurricane season is here

#218 Postby cycloneye » Mon Sep 22, 2025 4:18 pm

Category5Kaiju wrote:Rule 1 of tracking the tropics: "September Remember."

Rule 2 of tracking the tropics: "If you cancel the season at any point before fall rolls around, 99% of the time, you're going to be wrong."


About September, we can also say "September is September" :D
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Re: 2025 NATL hurricane season is here

#219 Postby psyclone » Mon Sep 22, 2025 4:20 pm

cycloneye wrote:Well, after being in the dead phase, it has awaken in a solid way and dont have to change the title. :D

psyclone
unless and until something happens it seems only reasonable that this thread title be updated to "2025 NATL hurricane non season is here.


I guess is not needed now.


We might actually get to see something happen. My preseason guess of 14-7-3 is still in da hunt. We're not dead yet
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Re: 2025 NATL hurricane season is here

#220 Postby cycloneye » Mon Sep 22, 2025 9:07 pm

Here is CSU report card of the season so far.

 https://x.com/philklotzbach/status/1970307095468654891

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