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Hurricane Ian


Scott747
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Eerily similar to forecast tracks and intensity for Charley at about this range. At this time yesterday, I did not expect a TD by morning, some were questioning why this was a cherry. Well, this is what happens when a wave already has a defined surface circulation and shear decreases just a little. I am not sure about intensity yet. I think a moderate hurricane (cat 1-2) is likely for SW Florida. There are a lot of negative factors for intensity: dry west flow/shear, land interaction, length of time over water after Cuba. However the extreme SE GOM and NW Caribbean look extremely conducive for strengthening especially with a developing upper level anticyclone as this passes Jamaica. Track guidance certainly seems to be nearing a much more condensed consensus for LF on the SW Florida peninsula. Definitely Tampa’s first significant threat since Charley

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First visible pictures of the day show all of the robust, deep and cold (near -80C cloud tops) convection east of the exposed LLC.  Have to believe new LLC will develop under the deep convection over the next 24 hours.  Where this ends up consolidating next 24-36 hours after it exits the shear zone will be a determining factor on eventual track.  Stay tuned.

VIS SAT.jpg

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6Z Tropical models clustering on SW Florida.  Some robust intensity forecasts in there.  Based on individual tracks from various models the stronger ones are the ones that go over western Cuba / nearer the Yucatan Channel then curve NE toward FL.  Weaker ones are the ones that track further east over Cuba with just a short time back over water before impacting SW Florida.  Still details to be determined.  Do keep in mind Charley exploded in the hours just prior to landfall and TPC was playing "catch up" in real time as Charley was closing in on SW Florida.  Charley was not forecast to be that strong 24-36 hours prior to landfall and was also forecast to go in further north up the FL west coast.  Charley was also a tight and compact hurricane.  Hermine will not be tight and compact...not sprawling but not small and compact.

6Z.jpg

INTENSITY.jpg

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1 hour ago, cptcatz said:

06z GFS with worst case scenario for Tampa. Good thing that won't happen since based on what I read here Tampa can't get hit? 

It’s not the worst case scenario based on that track.  Yes it would be a significant impact and highly disruptive.  Trajectory needs to be mid to north Pinellas Country to maximize surge potential.

And correct, Tampa will not be hit directly by a major hurricane next week.

 

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3 minutes ago, StormChaser4Life said:

That LLC is moving nw away from the deep convection. Earlier it was moving west just behind convection. Seems like it is really getting well removed now. 

I wouldn't be surprised if this LLC is getting ejected and we'll see a new one form to the west 

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1 hour ago, MANDA said:

First visible pictures of the day show all of the robust, deep and cold (near -80C cloud tops) convection east of the exposed LLC.  Have to believe new LLC will develop under the deep convection over the next 24 hours.  Where this ends up consolidating next 24-36 hours after it exits the shear zone will be a determining factor on eventual track.  Stay tuned.

VIS SAT.jpg

Isn’t the convection “west” of the exposed center? 

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8 minutes ago, StormChaser4Life said:

Yeah I'm thinking this exposed one flying nw won't be the main epicenter for getting the storm going. Probably one closer to the convection

For certain the exposed LLC is not the "one".  New one under the convection will be the one that gets the job done over the next 24-36 hours.  Going to be another 24-36 hours for entire TD to clear the she shear zone but once it does it will get down to business rather quickly.

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 From the 11 AM EDT NHC discussion:

 

The latest NHC track forecast lies near the 
center of the guidance envelope and closely follows the IVCN and 
HCCA aids. This prediction is very similar to the previous one, 
with only slight westward adjustments at days 3-5 to reflect the 
latest model consensus trends.

The moderate to strong deep-layer northeasterly shear over the 
cyclone is expected to persist through tonight, so only slight 
strengthening is forecast through early Saturday. But once the shear 
decreases to less than 10 kt this weekend, more significant 
intensification is forecast as the cyclone moves over SSTs in excess 
of 30 deg C. The latest NHC intensity forecast has been increased 
from the previous one and explicitly calls for rapid intensification 
as the cyclone crosses the northwestern Caribbean Sea. The system 
is forecast to approach the Cayman Islands and Cuba as a 
strengthening hurricane, with additional intensification likely once 
it emerges over the warm waters of the southeastern Gulf of Mexico. 
In fact, this forecast calls for the system to approach the Florida 
peninsula as a major hurricane by day 5, which is supported by the 
latest IVCN and HCCA aids.
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3 minutes ago, GaWx said:

 From the 11 AM EDT NHC discussion:

 

The latest NHC track forecast lies near the 
center of the guidance envelope and closely follows the IVCN and 
HCCA aids. This prediction is very similar to the previous one, 
with only slight westward adjustments at days 3-5 to reflect the 
latest model consensus trends.

The moderate to strong deep-layer northeasterly shear over the 
cyclone is expected to persist through tonight, so only slight 
strengthening is forecast through early Saturday. But once the shear 
decreases to less than 10 kt this weekend, more significant 
intensification is forecast as the cyclone moves over SSTs in excess 
of 30 deg C. The latest NHC intensity forecast has been increased 
from the previous one and explicitly calls for rapid intensification 
as the cyclone crosses the northwestern Caribbean Sea. The system 
is forecast to approach the Cayman Islands and Cuba as a 
strengthening hurricane, with additional intensification likely once 
it emerges over the warm waters of the southeastern Gulf of Mexico. 
In fact, this forecast calls for the system to approach the Florida 
peninsula as a major hurricane by day 5, which is supported by the 
latest IVCN and HCCA aids.

Interesting for sure.  We’ve beaten the Tampa thing to death, but it’s pretty rare for a major to landfall anywhere in Florida.

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1 minute ago, TPAwx said:

Interesting for sure.  We’ve beaten the Tampa thing to death, but it’s pretty rare for a major to landfall anywhere in Florida.

Is it? Off the top of my head in the last 20 years there were Ivan, Charley, Jeanne, Wilma, Michael, and Irma all landfalling as majors in Florida. 

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3 minutes ago, cptcatz said:

Is it? Off the top of my head in the last 20 years there were Ivan, Charley, Jeanne, Wilma, Michael, and Irma all landfalling as majors in Florida. 

 

He may have meant from the Atlantic side...after Betsy in 65 it seemed majors hitting FL from the Atlantic side became increasingly more infrequent outside of Andrew and 2004

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3 minutes ago, SnowGoose69 said:

 

He may have meant from the Atlantic side...after Betsy in 65 it seemed majors hitting FL from the Atlantic side became increasingly more infrequent outside of Andrew and 2004

It's nice to give him the benefit of the doubt but that makes no sense since he specifically said anywhere in Florida, plus this storm is coming from the Gulf side so if that's what he meant it doesn't apply to what we're dealing with here lol

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