ATL: CINDY - Post-Tropical - Discussion

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Re: ATL: INVEST 93L - Discussion

#461 Postby AJC3 » Mon Jun 19, 2017 10:26 am

TheStormExpert wrote::uarrow: Unless that ULL just south of the Louisiana coastline dissipates or moves out of the way don't expect much(if at all any) in the way of development.


I wouldn't go as far as saying "if at all". This is very likely to form into a coherent, albeit broad low. Pressures have been slowly falling (now down to 1005-1006MB).


The mid-upper low/trough causing the shear was never really forecast to dissipate or get out of the way by the model guidance for most of the system's existence. And while it certainly is limiting the speed with which the system is organizing, the resultant shear over the formative system is *highly* divergent, and I do mean highly. All along, the model guidance has suggested this will be a BE type system with significant evacuation of mass aloft being the primary mechanism for lowering pressures during it's formative process. This has always been advertised to be a broad sloppy "right-sided" system, but still intensifying (in spite of the shear) due to the aforementioned BE.
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Re: ATL: INVEST 93L - Discussion

#462 Postby Steve » Mon Jun 19, 2017 10:27 am

I'm going to disagree with you all on that one. I expect it to look much, much better in 24 and then in 36 hours. It's going to be weighted East and probably somewhat North in the 36-48 hour period, but I'd expect this to look significantly better once out in the central Gulf. I'm not thinking that it's going to get all that strong or anything. But as of now it's an elongated trough which should consolidate once farther off the coast of the YP. Certainly I could be wrong, but I don't think so in this case. It's liable to look much more like a depression/tropical storm before landfall.
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Re: ATL: INVEST 93L - Discussion

#463 Postby jasons2k » Mon Jun 19, 2017 10:34 am

The wild card will be when the ULL drops south and slingshots the system westward to the coast, will it have an opportunity to be positioned where it can attempt a last minute bomb as it approaches the coast? All we can do is wait and see.
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Re: ATL: INVEST 93L - Discussion

#464 Postby Ivanhater » Mon Jun 19, 2017 10:43 am

12z GFS once again slamming the north central gulfcoast with heavy torrential rain
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Re: ATL: INVEST 93L - Models

#465 Postby Steve » Mon Jun 19, 2017 10:46 am

NAM 3km Resolution (only goes out to 60 hours shows 10-12" of rain just offshore of Pensacola Beach, along the MS Gulf Coast and parts of Southeast LA. (run the loop obviously)

http://www.tropicaltidbits.com/analysis ... s=0&ypos=0

The 12km Resolution has 10-12" across South MS and SE LA.

http://www.tropicaltidbits.com/analysis ... s=0&ypos=0

GFS out to 30" has a swath of 10-12" offshore hooking toward SE LA.
http://www.tropicaltidbits.com/analysis ... 0&ypos=415

NAM does a couple of dips presumably interactions with the ULL to the west and also the high pressure in the SW with the northerly flow around the eastern side of that. NAM 32km ends up over the Houston Metro at 84 hours when the run ends. Looks like a lot of 3+ rain from SE Texas across to the Panhandle. Some people will be unlucky with river/stream flooding and you know we'll get some street flooding here if we get more than 2-3" in any given period. This sucks because my street floods all the time. My apartment is about 15-18 feet up, but you have to park away to avoid the heavy rain. I'll be watching that closely.

GFS to 66 Hours has the most rain in Southern Mississippi and then another swath up from around Bainbridge, GA 150 miles inland into Georgia. But I think this is bogus, because the GFS still landfalls in South Louisiana around 60 hours (which would be Wednesday daytime).
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Re: ATL: INVEST 93L - Models

#466 Postby PTrackerLA » Mon Jun 19, 2017 11:06 am

12z GFS-para
Image
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Re: ATL: INVEST 93L - Discussion

#467 Postby psyclone » Mon Jun 19, 2017 11:08 am

It's nice to see the emphasis on following the convection, something I'm always big on in formative/poorly organized systems. we continue to have a linear firehose east of the system which looks to be on a collision course from the western florida panhandle to Louisiana. Someone within that zone may really get creamed. As it stands now, unless the eventual center passes to your west/south, no soup for you. this could make for a challenging forecast as the west cutoff of the heavy precip may be rather abrupt. as always it will be interesting to watch this evolve but that's the way it looks now and is how these situation end up more often than not. Peninsular Florida is east of the steady convection but still in a zone of deep moisture and fast moving showers/squally weather.
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Re: ATL: INVEST 93L - Models

#468 Postby TheStormExpert » Mon Jun 19, 2017 11:10 am

PTrackerLA wrote:12z GFS-para
Image

Can't believe that is going to be the new GFS. This should be a good test to see how good that model is.
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Re: ATL: INVEST 93L - Discussion

#469 Postby GCANE » Mon Jun 19, 2017 11:11 am

Cell NE of Cancun shows a strong image on microwave.

http://rammb.cira.colostate.edu/product ... 191234.GIF

Zooming in on VIS GOES-16, seeing some decent overshooting tops.
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Re: ATL: INVEST 93L - Models

#470 Postby PTrackerLA » Mon Jun 19, 2017 11:12 am

[/quote]
Can't believe that is going to be the new GFS. This should be a good test to see how good that model is.[/quote]

Yeah and just 60 hours out, surely it can't whiff that bad in the short-term? We're in for a long season with these models... :lol:
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Re: ATL: INVEST 93L - Discussion

#471 Postby stormreader » Mon Jun 19, 2017 11:15 am

Steve wrote:I'm going to disagree with you all on that one. I expect it to look much, much better in 24 and then in 36 hours. It's going to be weighted East and probably somewhat North in the 36-48 hour period, but I'd expect this to look significantly better once out in the central Gulf. I'm not thinking that it's going to get all that strong or anything. But as of now it's an elongated trough which should consolidate once farther off the coast of the YP. Certainly I could be wrong, but I don't think so in this case. It's liable to look much more like a depression/tropical storm before landfall.

Yes. It's amazing how fast things can change. And models have generally said about 997 mb or so in that area, I think, about a 60 mph storm. I think that's likely. Then you may still have 24 hours before landfall. So I'm going to guess about 70 mph at landfall.
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Re: ATL: INVEST 93L - Discussion

#472 Postby lrak » Mon Jun 19, 2017 11:23 am

Called my buddy down in S. Padre and he said take Thursday off and we'll have a clean swell with offshore winds if it goes to TX / LA border.

We call this Costa Rica for FREE :D
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Re: ATL: INVEST 93L - Discussion

#473 Postby Tireman4 » Mon Jun 19, 2017 11:31 am

lrak wrote:Called my buddy down in S. Padre and he said take Thursday off and we'll have a clean swell with offshore winds if it goes to TX / LA border.

We call this Costa Rica for FREE :D


Oh sir...LOL
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Re: ATL: INVEST 93L - Discussion

#474 Postby jasons2k » Mon Jun 19, 2017 11:33 am

lrak wrote:Called my buddy down in S. Padre and he said take Thursday off and we'll have a clean swell with offshore winds if it goes to TX / LA border.

We call this Costa Rica for FREE :D


Hi Karl - good to see you again - I think you need to keep a close watch on this one.
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Re: ATL: INVEST 93L - Discussion

#475 Postby floridasun78 » Mon Jun 19, 2017 11:34 am

here south fl raining cat and dog don't see 93l moving west yet
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Re: ATL: INVEST 93L - Discussion

#476 Postby jasons2k » Mon Jun 19, 2017 11:37 am

If you look at Hi-Res satellite loops over SE Texas this morning, you can see the low-level flow slowly shift from onshore, to offshore, in response to lowering pressures in the Gulf. This is evidenced by the cumulus clouds moving onshore, stalling, and then reversing as the flow switches.
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Re: ATL: INVEST 93L - Models

#477 Postby Steve » Mon Jun 19, 2017 11:38 am

CMC 12Z hits at 992mb at Galveston Island and comes inland around Texas City.
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Re: ATL: INVEST 93L - Discussion

#478 Postby GCANE » Mon Jun 19, 2017 11:40 am

Starting to see a Theta-E ridge build north of the naked swirl.
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Re: ATL: INVEST 93L - Discussion

#479 Postby ronjon » Mon Jun 19, 2017 11:47 am

Almost getting a subtropical cyclone look to it now on SAT. Low forming closer to 24N-88W now with convection wrapping around it?

http://www.ssd.noaa.gov/PS/TROP/floaters/93L/flash-vis-long.html
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Re: ATL: INVEST 93L - Models

#480 Postby stormlover2013 » Mon Jun 19, 2017 11:56 am

Ukmet Freeport tx
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