ATL: LAURA - Post-Tropical - Discussion

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Re: ATL: INVEST 98L - Discussion

#461 Postby craptacular » Wed Aug 19, 2020 10:42 am

eastcoastFL wrote:Icon still heading north of the islands. I guess it’s up in the air until we get a good center fix. When would the first recon flight be? Tomorrow sometime?


Well, they haven't yet posted today, but from yesterday:
2. OUTLOOK FOR SUCCEEDING DAY:
A. POSSIBLE LOW-LEVEL INVEST INTO A SOUTHWEST CARIBBEAN SYSTEM
FOR 20/1800Z NEAR 14.0N 79.0W.
B. NOAA 42 AND NOAA 43 P-3 AIRCRAFT MAY FLY TDR MISSIONS INTO
A CENTRAL ATLANTIC SYSTEM, DEPARTING TISX TENTATIVELY AT
20/2000Z AND 21/0830Z.
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Re: ATL: INVEST 98L - Discussion

#462 Postby chris_fit » Wed Aug 19, 2020 10:44 am

Getting that tropical look!

Image
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Re: ATL: INVEST 98L - Discussion

#463 Postby SFLcane » Wed Aug 19, 2020 10:44 am

wxman57 wrote:
SFLcane wrote:
wxman57 wrote:My track yesterday had it crossing the islands of the NE Caribbean Fri PM/Sat AM then moving along the coasts of the DR & Cuba Sun/Mon, possibly as a weak TS interacting with land or a depression. It may be moving fast enough there to produce 40 mph winds on the north side. The environment won't be THAT favorable for strengthening over the next 5 days. I had it in the east-central Gulf Tuesday morning as a 40 kt TS yesterday. Today's track is similar, but advances the center to near the AL/FL border Wednesday afternoon as a 55 kt TS. Why 55 kts? Just a guess this far out. Somewhere between an open wave and a Cat 2 hurricane. Don't want to cause too much alarm 7 days out for Gulf Coast clients.

I like how some of the models (UKMET, CMC, ICON) have two storms in the Gulf at the same time next Mon/Tue. That would be fun - NOT! Oh well, it is 2020, what else could go wrong?


Seems like a non issue for SFL per this post.


I wouldn't make that conclusion just yet. A track away from the DR & Cuba could lead to strong TS winds in South Florida. Can't rule out a hurricane, but I don't think a hurricane would be likely in the FL straits.


Great thanks 57. Appreciate it
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Re: ATL: INVEST 98L - Discussion

#464 Postby plasticup » Wed Aug 19, 2020 10:47 am

chris_fit wrote:Getting that tropical look!

https://i.imgur.com/CY0q4DS.gif


Looks closed to me.
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Re: ATL: INVEST 98L - Discussion

#465 Postby SFLcane » Wed Aug 19, 2020 10:48 am

Building convention close to center.

Image
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Re: ATL: INVEST 98L - Discussion

#466 Postby cheezyWXguy » Wed Aug 19, 2020 10:48 am

wxman57 wrote:
SFLcane wrote:
wxman57 wrote:My track yesterday had it crossing the islands of the NE Caribbean Fri PM/Sat AM then moving along the coasts of the DR & Cuba Sun/Mon, possibly as a weak TS interacting with land or a depression. It may be moving fast enough there to produce 40 mph winds on the north side. The environment won't be THAT favorable for strengthening over the next 5 days. I had it in the east-central Gulf Tuesday morning as a 40 kt TS yesterday. Today's track is similar, but advances the center to near the AL/FL border Wednesday afternoon as a 55 kt TS. Why 55 kts? Just a guess this far out. Somewhere between an open wave and a Cat 2 hurricane. Don't want to cause too much alarm 7 days out for Gulf Coast clients.

I like how some of the models (UKMET, CMC, ICON) have two storms in the Gulf at the same time next Mon/Tue. That would be fun - NOT! Oh well, it is 2020, what else could go wrong?


Seems like a non issue for SFL per this post.


I wouldn't make that conclusion just yet. A track away from the DR & Cuba could lead to strong TS winds in South Florida. Can't rule out a hurricane, but I don't think a hurricane would be likely in the FL straits.

What impediments do you see to intensification besides land interaction that would reduce the likelihood of something like the ICON is depicting?
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Re: ATL: INVEST 98L - Discussion

#467 Postby NDG » Wed Aug 19, 2020 10:51 am

plasticup wrote:
chris_fit wrote:Getting that tropical look!

https://i.imgur.com/CY0q4DS.gif


Looks closed to me.


Not quite there yet, at least 4 hours ago it was still attached to the ITCZ, but much better yesterday.

Image
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Re: ATL: INVEST 98L - Discussion

#468 Postby toad strangler » Wed Aug 19, 2020 10:53 am

Not even at 45 W yet. Such a long way to go. Much can change IRT track.
Last edited by toad strangler on Wed Aug 19, 2020 10:53 am, edited 1 time in total.
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Re: ATL: INVEST 98L - Discussion

#469 Postby aspen » Wed Aug 19, 2020 10:53 am

chris_fit wrote:Getting that tropical look!

https://i.imgur.com/CY0q4DS.gif

That’s some very nice and defined rotation there. I wouldn’t be too surprised if it becomes a TC by the end of the day.
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Re: ATL: INVEST 98L - Discussion

#470 Postby Evil Jeremy » Wed Aug 19, 2020 10:53 am

My eyes are straining with the amount of posts I'm seeing trying to nail down a conclusive 5+ day solution this far out. How about this time we try to avoid "Florida's clear" or "Florida's in danger" posts that are delivered with certainty? We just did this a month ago, with people flopping between solutions they were very sure of until the next day.

The truth of the matter is we won't be any closer to determining potential impacts to the SE USA for another couple of days. There's no reason to race to conclusions right now.
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Re: ATL: INVEST 98L - Discussion

#471 Postby Shell Mound » Wed Aug 19, 2020 10:55 am

Last edited by Shell Mound on Wed Aug 19, 2020 10:59 am, edited 1 time in total.
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Re: ATL: INVEST 98L - Discussion

#472 Postby BYG Jacob » Wed Aug 19, 2020 10:57 am

A modest convective burst would get this to a TD
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Re: ATL: INVEST 98L - Discussion

#473 Postby DestinHurricane » Wed Aug 19, 2020 10:58 am

Here's my unprofessional guess. Image
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Re: ATL: INVEST 98L - Discussion

#474 Postby SFLcane » Wed Aug 19, 2020 10:59 am

Based on latest satellite imagery, it appears #Invest98L is beginning to commence TCG. This is denoted by the increased low-level and mid-level vorticity and banding features on the southern side of the wave axis. Obs in the next 48 hours will be crucial for its future prospects.

https://twitter.com/tylerjstanfield/sta ... 21280?s=21
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Re: ATL: INVEST 98L - Discussion

#475 Postby TallyTracker » Wed Aug 19, 2020 11:09 am

This looks like the burst that will make 98L a tropical cyclone! We’ll likely need a fresh ASCAT to confirm prior to classification, but it looks like it’ll be a TD within 12 hours.
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ATL: INVEST 98L - Discussion

#476 Postby Sanibel » Wed Aug 19, 2020 11:10 am

Headache...

Waits to unleash its strength instead of playing out at the last minute like Irma...

All hands be prepared...
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Re: ATL: INVEST 98L - Discussion

#477 Postby wxman57 » Wed Aug 19, 2020 11:12 am

cheezyWXguy wrote:
wxman57 wrote:What impediments do you see to intensification besides land interaction that would reduce the likelihood of something like the ICON is depicting?


Dry air and at least some wind shear, though not as bad as with Josephine. I don't think the ICON model is handling the environment near the storm well. I've never found it to do a very good job with tropical cyclones.

As a side note, I'm expecting the NHC to initiate PTC advisories this afternoon (could be a depression then). Still looks much better than TS Josephine last weekend, but no ASCAT to conform well-defined LLC. I've seen what looked clearly like a TS in the Caribbean on satellite with recon unable to close off a circulation.
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Re: ATL: INVEST 98L - Discussion

#478 Postby Kazmit » Wed Aug 19, 2020 11:16 am

DestinHurricane wrote:Here's my unprofessional guess. https://i.imgur.com/qPiStpz.png
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Certainly possible if it develops quickly and gains some latitude, avoiding land interaction.
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Re: ATL: INVEST 98L - Discussion

#479 Postby SFLcane » Wed Aug 19, 2020 11:19 am

wxman57 wrote:
cheezyWXguy wrote:
wxman57 wrote:What impediments do you see to intensification besides land interaction that would reduce the likelihood of something like the ICON is depicting?


Dry air and at least some wind shear, though not as bad as with Josephine. I don't think the ICON model is handling the environment near the storm well. I've never found it to do a very good job with tropical cyclones.

As a side note, I'm expecting the NHC to initiate PTC advisories this afternoon (could be a depression then). Still looks much better than TS Josephine last weekend, but no ASCAT to conform well-defined LLC. I've seen what looked clearly like a TS in the Caribbean on satellite with recon unable to close off a circulation.


:eek:
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Re: ATL: INVEST 98L - Discussion

#480 Postby Evil Jeremy » Wed Aug 19, 2020 11:21 am

wxman57 wrote:As a side note, I'm expecting the NHC to initiate PTC advisories this afternoon (could be a depression then). Still looks much better than TS Josephine last weekend, but no ASCAT to conform well-defined LLC. I've seen what looked clearly like a TS in the Caribbean on satellite with recon unable to close off a circulation.


Not that I would ever have a reason to second guess you of all people, but given this still roughly 2.5 days away from bringing TS conditions to the St. Maarten region, wouldn't this be a bit early to issue TS watches (which as I understand it is the primary reasoning for PTC designation)? Hasn't even been mentioned yet in the TWO, which is often a precursor to PTC advisories.
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