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2025 Atlantic Hurricane Season


BarryStantonGBP
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1 minute ago, BarryStantonGBP said:

So the lemon could burst

over for lemon

Not necessarily—I don’t have time to illustrate it but the wave looks like it is further south and likely to get caught up in the monsoon trough. That increases the odds of development because it likely puts more distance between the wave and the TUTT as it moves westward and tries to develop. But there’s a lot to sort out still. 
 

93331174.gif?0.4450331742603323

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48 minutes ago, WxWatcher007 said:

Not necessarily—I don’t have time to illustrate it but the wave looks like it is further south and likely to get caught up in the monsoon trough. That increases the odds of development because it likely puts more distance between the wave and the TUTT as it moves westward and tries to develop. But there’s a lot to sort out still. 
 

93331174.gif?0.4450331742603323

One model run had it split at the end of the tutt

 

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There’s an unusually large disagreement between GEFS and EPS regarding the MJO as they almost couldn’t be further apart!

1. GEFS heads for less threatening MC/W Pac (at low amp) pretty quickly and is on phase 6/7 border on 9/15 (supported by CMC):

IMG_4492.png.2ffadb3df4e4208e4f57eb870889ca13.png

2. Euro ens stuck mainly in phase 2, the most dangerous phase for Conus H hits in JAS (supported by JMA):

IMG_4493.png.15601beb5b6942f14a85404921214e59.png

 

I may be forgetting but I can’t recall ever seeing this degree of disagreement between these two! I don’t have a good feel for which will verify more closely but of course it could end up between the two.

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8 minutes ago, GaWx said:

There’s an unusually large disagreement between GEFS and EPS regarding the MJO as they almost couldn’t be further apart!

1. GEFS heads for less threatening MC/W Pac (at low amp) pretty quickly and is on phase 6/7 border on 9/15 (supported by CMC):

IMG_4492.png.2ffadb3df4e4208e4f57eb870889ca13.png

2. Euro ens stuck mainly in phase 2, the most dangerous phase for Conus H hits in JAS (supported by JMA):

IMG_4493.png.15601beb5b6942f14a85404921214e59.png

 

I may be forgetting but I can’t recall ever seeing this degree of disagreement between these two! I don’t have a good feel for which will verify more closely but of course it could end up between the two.

Gfs is a meme

go with euro

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17 hours ago, BarryStantonGBP said:

Gfs is a meme

go with euro

 Wow, what a massive fold by GEFS to EPS in today’s MJO forecast! Whereas the EPS is similar to yesterday’s idea of not going to the right side (MC), GEFS abandoned the typical counterclockwise path that it had yesterday through MC and then to 6/7. Today, it remains in 2 through 9/11 and then crawls “backwards” up to 1 followed by 8 as of 9/16 (all mainly inside the circle, i.e., low amp). The EPS is very similar:

Today’s (9/2) GEFS prog:

IMG_4495.png.3fe6d5989499df21e3fe55f05815eb01.png

Compare today’s GEFS to yesterday’s (9/1) GEFS prog: huge change!

IMG_4492.png.b6d16a460924879971aee45c787e2398.png
 

Thus, 9/2 EPS, which is very similar to 9/1 EPS, is very similar to 9/2 GEFS as it also ends up in low amp 8:

IMG_4496.png.8098f7cb6531fab67a83108c1eed0d53.png

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11 minutes ago, GaWx said:

 Wow, what a massive fold by GEFS to EPS in today’s MJO forecast! Whereas the EPS is similar to yesterday’s idea of not going to the right side (MC), GEFS abandoned the typical counterclockwise path that it had yesterday through MC and then to 6/7. Today, it remains in 2 through 9/11 and then crawls “backwards” up to 1 followed by 8 as of 9/16 (all mainly inside the circle, i.e., low amp). The EPS is very similar:

Today’s (9/2) GEFS prog:

IMG_4495.png.3fe6d5989499df21e3fe55f05815eb01.png

Compare today’s GEFS to yesterday’s (9/1) GEFS prog: huge change!

IMG_4492.png.b6d16a460924879971aee45c787e2398.png
 

Thus, 9/2 EPS, which is very similar to 9/1 EPS, is very similar to 9/2 GEFS:

IMG_4496.png.8098f7cb6531fab67a83108c1eed0d53.png

no wonder models had a wcar/gulf threat 

it'll go on and off for now

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4 hours ago, BarryStantonGBP said:

no wonder models had a wcar/gulf threat 

it'll go on and off for now

 The 12Z EPS has a notable signal for a TC formation (~25%) in the S Gulf with them moving mainly N to WNW and then hitting or threatening to hit from NE MX through TX/LA. But this could be mainly gone on the 0Z for all we know since this run looks much different vs earlier runs and its way out in the unreliable late week 2.

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Erin left a heck of a cold wake across the nw Atlantic, while the ENSO regions have cooled dramatically past two weeks. How will this influence Atlantic hurricane activity this month, and what are the two areas I am watching besides the E. Atl system?

I go into depth on the large-scale factors for the next few weeks including Sep analogs, while looking at the "elephant in the room" that is being largely ignored IMHO because most tropical enthusiasts are focusing on the East Atlantic system.

https://hurricanehacker.substack.com/p/the-times-they-are-changin

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EPS and GEFS both show notable upticks in activity beyond the 10th. As were in the peak of hurricane season that is not surprising. The good news is that at least through mid month, the eastern trough hangs on which continues to be a deterrent to any storm approaching from the east. I think the CAG seen on some GFS runs is overblown as it tends to do but with La Niña developing and a tendency for shear to decrease this time of year I’d expect to start looking to the carribean and southern gulf. SSTs continue to decrease off the east coast from NC northward and I fished Friday out of Morehead and can confirm how much it has cooled. Water was 76-77 until about 35 miles out and warmed to 82 in the stream. Contrast to when I fished last week of July in same location and the temp never fell below 83 from the inlet to the stream and the stream was 87. That’s a huge difference in energy available of anything threatens NC-northward from a month ago. To me, this feels like the lid is starting to come off a bit in the Atlantic and mid month looks to be quite active 

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