ATL: LARRY - Post-Tropical - Discussion

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Re: ATL: INVEST 90L - Discussion

#61 Postby Teban54 » Tue Aug 31, 2021 8:32 am

Category5Kaiju wrote:While I expect future Larry to be a powerful fish storm and do a safe recurve, if for whatever reason the trajectory models trend more westward, I think this will really underline the idea that we need to study the interactions and dynamics between TCs and ridging/troughing better. Also, just out of curiosity, but does anybody know what the path models portrayed with storms like Isabel, Hugo, Irma, Florence, or Teddy when they were in their very early stages? Did they show a safe recurve, or did at least some of them imply a risk to land?

Hugo and Isabel are likely too old for models or at least model posts to exist, but IIRC when Irma was just a model storm that had not left Africa, most model runs didn't show the SW turn and had it recurving to the sea. When the wave just left Africa and was declared an invest, however, models seemed to be gradually trending west. Lots of broken images in the Irma model thread, but I found this on page 1:
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By the time it was developing to a TS, the left-biased Euro started showing it coming close to the eastern seaboard (though definitely not SW Florida), and the thread was full of debates about whether it would go OTS:
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Btw, I found this for anyone who wants to do some SST comparisons:
Image
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Re: ATL: INVEST 90L - Discussion

#62 Postby Teban54 » Tue Aug 31, 2021 8:39 am

As for Florence, very early model runs before it left Africa also showed OTS tracks, with maybe one or two GPS members showing it moving west (like what eventually occurred). When it was already a TD/TS off the coast of Africa, models started showing the ridge getting stronger and Florence stalling in the mid latitudes, but many still eventually take it OTS:
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Re: ATL: INVEST 90L - Discussion

#63 Postby CyclonicFury » Tue Aug 31, 2021 10:15 am

Looks like 90L is well on its way to TCG. An earlier ASCAT pass indicated that the circulation was closed, but still elongated. SAB already gave 90L a T2.0 Dvorak fix, so the convective organization is likely sufficient. The current convective bursts near the center should tighten it up and we should have a tropical depression in the next 6-12 hours. I wouldn't be surprised if 90L does what 2020 could not: become a hurricane in the eastern MDR east of 40°W.
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Re: ATL: INVEST 90L - Discussion

#64 Postby Sciencerocks » Tue Aug 31, 2021 10:22 am

Image
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Re: ATL: INVEST 90L - Discussion

#65 Postby aspen » Tue Aug 31, 2021 11:25 am

This is coming together very quickly. It’ll probably be a TD either at the 5pm or 11pm advisories.

The Euro did a fantastic job forecasting 90L, which is quite the turn from last year when it wouldn’t show a storm forming until a storm had already formed. Its intensity estimates could be close as well, too.
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Re: ATL: INVEST 90L - Discussion

#66 Postby InfernoFlameCat » Tue Aug 31, 2021 11:33 am

Looking very healthy. I am keeping an eye on this one. fingers crossed it goes OTS but one never knows this far out in this set up.
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Re: ATL: INVEST 90L - Discussion

#67 Postby weeniepatrol » Tue Aug 31, 2021 11:45 am

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Re: ATL: INVEST 90L - Discussion

#68 Postby Iceresistance » Tue Aug 31, 2021 12:05 pm

I really hope that 90L (Larry) does not pull a Irma or Florence, the Models severely miscalculated the Ridge with those 2 storms . . .
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Re: ATL: INVEST 90L - Discussion

#69 Postby Category5Kaiju » Tue Aug 31, 2021 12:05 pm

 https://twitter.com/wxkassell/status/1432745347256922114




Hmmm, this kind of throws a wrench into the idea that we are 100% confident that an all-out fish storm will occur...
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Re: ATL: INVEST 90L - Discussion

#70 Postby SconnieCane » Tue Aug 31, 2021 12:46 pm

Just got caught up on the models thread. Where have we seen this song and dance before...each suite of runs just a little more SW, a little more ridging. :eek:
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Re: ATL: INVEST 90L - Discussion

#71 Postby ouragans » Tue Aug 31, 2021 1:06 pm

1. Showers and thunderstorms have become better organized in association with a well-defined low pressure system located over the far eastern tropical Atlantic, a few hundred miles west of the coast of Guinea. If these development trends continue, a tropical depression is likely to form later today or tonight while the system moves westward to west-northwestward at around 20 mph across the eastern tropical Atlantic.

* Formation chance through 48 hours...high..90 percent.
* Formation chance through 5 days...high...90 percent.
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Re: ATL: INVEST 90L - Discussion

#72 Postby AutoPenalti » Tue Aug 31, 2021 1:08 pm

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Re: ATL: INVEST 90L - Discussion

#73 Postby aspen » Tue Aug 31, 2021 2:18 pm

90L looks to be concentrating around 11.5-12.0N, right where the HWRF said it would. I hope we get another ASCAT pass to see what’s going on under the hood. Based on today’s trends, a TS by the 11am advisory tomorrow is a real possibility, and I could see Larry becoming a hurricane within 48-60 hours.
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Re: ATL: INVEST 90L - Discussion

#74 Postby cycloneye » Tue Aug 31, 2021 2:23 pm

AL, 90, 2021083118, , BEST, 0, 108N, 202W, 30, 1006, LO
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Re: ATL: INVEST 90L - Discussion

#75 Postby Blown Away » Tue Aug 31, 2021 2:28 pm

cycloneye wrote:
AL, 90, 2021083118, , BEST, 0, 108N, 202W, 30, 1006, LO


Pretty close to due W all day.
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Re: ATL: INVEST 90L - Discussion

#76 Postby ouragans » Tue Aug 31, 2021 2:35 pm

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Re: ATL: INVEST 90L - Discussion

#77 Postby cycloneye » Tue Aug 31, 2021 2:42 pm

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Re: ATL: INVEST 90L - Discussion

#78 Postby cycloneye » Tue Aug 31, 2021 2:44 pm

The demize of Kate may cause the ridge to build but is only my opinion.
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Re: ATL: INVEST 90L - Discussion

#79 Postby Stormybajan » Tue Aug 31, 2021 3:20 pm

I'm thinking TD at 5 given its current IR presentation.. I think Bermuda will have to watch this over the next week
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Re: ATL: INVEST 90L - Discussion

#80 Postby Landy » Tue Aug 31, 2021 3:22 pm

RAMMB does have this listed as TD12. I'm not sure if the NHC usually follows afterwards though. But I do agree it should be at 5PM.
https://rammb-data.cira.colostate.edu/tc_realtime/
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