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Major Hurricane Helene


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16 minutes ago, hawkeye_wx said:

It is likely the very intense hurricane models are organizing the system too quickly in the nw Caribbean.  They are predicting a rapidly-strengthening hurricane before it even reaches the gulf.  The Euro, on the other hand, has further-delayed the organization over the last two runs.  It now has the system only slowly pulling the energy together over the next two days and reaching tropical storm status, 30+ mb weaker than the overzealous hurricane models at the Yucatan Channel.

Most of the ex-Euro solutions leave minimal prep and evac time here and thru the panhandle.  Unlike the typical CV systems that are on the public radar for a week or more..  This one is only starting to get local attention this AM.

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1 minute ago, 1234snow said:

Decent spin just west of Jamaica. I’m assuming just the MLC is there or does it appear that a LLC is forming in that area?

The modeled track kind of shows it taking an eastward jog out to near Jamaica  then turning back wnw into the Yucatan channel.

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It seems as if the soon to be intense hurricane John (start paying attention now to the EPaC thread that thing is cranking) is pushing genesis for future Helene further east.  Interested to see morning model runs but I’m starting to like a just north of tampa solution

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5 minutes ago, Normandy said:

It seems as if the soon to be intense hurricane John (start paying attention now to the EPaC thread that thing is cranking) is pushing genesis for future Helene further east.  Interested to see morning model runs but I’m starting to like a just north of tampa solution

That would be a substantial shift east of any current model output. The upper trough is going to influence the track more than anything in the EPAC. 

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We are going to have to stop booking trips to Orlando in September.  This will be year 2 of 2 (we had Idalia last year that came through right before we were scheduled to leave.  We were supposed to leave for Orlando on Friday but bumped it up to Thursday to avoid most of the storm but the current modeling may not make that very favorable.

Plan was to go down I-95 instead of 75 based on the current track and cut into Orlando via I-4.  Does this seem viable or do we need to just be prepared to scrap this trip all together? Thought was to leave home around 5AM and be in Orlando 12PM.

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5 minutes ago, accountingdawg2012 said:

We are going to have to stop booking trips to Orlando in September.  This will be year 2 of 2 (we had Idalia last year that came through right before we were scheduled to leave.  We were supposed to leave for Orlando on Friday but bumped it up to Thursday to avoid most of the storm but the current modeling may not make that very favorable.

Plan was to go down I-95 instead of 75 based on the current track and cut into Orlando via I-4.  Does this seem viable or do we need to just be prepared to scrap this trip all together? Thought was to leave home around 5AM and be in Orlando 12PM.

I'm supposed to in Florida on Thursday, flying down that evening.  Destin, FL :weep:

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Just now, stormtracker said:

I'm supposed to in Florida on Thursday, flying down that evening.  Destin, FL :weep:

Yeah we are supposed to be taking the kids to Disney.  I'm not concerned about being there with any effects from storm bands at the hotel since Disney does a pretty good job in securing their facilities.  I'm more concerned about getting there.  I think the I-75 route is absolutely a no-go but right now I-95 seems doable if we leave early enough.  I am glad we live in driving distance and don't have to fly though because a flight though that would be absolutely not fun.

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BULLETIN
Potential Tropical Cyclone Nine Advisory Number   1
NWS National Hurricane Center Miami FL       AL092024
1100 AM EDT Mon Sep 23 2024

...DISTURBANCE FORECAST TO STRENGTHEN OVER THE NEXT FEW DAYS...
...TROPICAL STORM WARNINGS AND HURRICANE WATCHES ISSUED FOR PORTIONS
OF MEXICO AND CUBA...


SUMMARY OF 1100 AM EDT...1500 UTC...INFORMATION
-----------------------------------------------
LOCATION...17.6N 82.0W
ABOUT 130 MI...205 KM SSW OF GRAND CAYMAN
ABOUT 350 MI...565 KM SSE OF THE WESTERN TIP OF CUBA
MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H
PRESENT MOVEMENT...N OR 350 DEGREES AT 6 MPH...9 KM/H
MINIMUM CENTRAL PRESSURE...1004 MB...29.65 INCHES


WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

The government of Mexico has issued a Tropical Storm Warning for
the Yucatan Peninsula of Mexico from Rio Lagartos to Tulum, and a
Hurricane Watch from Cabo Catoche to Tulum.

The government of Cuba has issued a Tropical Storm Warning for the
Isle of Youth, Artemisa, and Pinar del Rio, and a Hurricane Watch
for Pinar del Rio.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Hurricane Watch is in effect for...
* Cabo Catoche to Tulum, Mexico
* Cuban province of Pinar del Rio

A Tropical Storm Warning is in effect for...
* Rio Lagartos to Tulum, Mexico
* Cuban provinces of Artemisa, and Pinar del Rio, and the Isle of 
Youth 

A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, in this case within 
the next 24 to 36 hours.

A Hurricane Watch means that hurricane conditions are possible
within the watch area.  A watch is typically issued 48 hours
before the anticipated first occurrence of tropical-storm-force
winds, conditions that make outside preparations difficult or
dangerous.

For storm information specific to your area, please monitor
products issued by your national meteorological service.


DISCUSSION AND OUTLOOK
----------------------
At 1100 AM EDT (1500 UTC), the disturbance was centered near 
latitude 17.6 North, longitude 82.0 West. The system is moving 
toward the north near 6 mph (9 km/h). A northwestward motion is 
expected on Tuesday and Tuesday night, followed by a faster 
northward or north-northeastward motion on Wednesday and Thursday. 
On the forecast track, the center of the system is forecast to move 
across the northwestern Caribbean Sea and into the southeastern Gulf 
of Mexico during the next couple of days.

Maximum sustained winds are near 30 mph (45 km/h) with higher gusts.
Strengthening is expected during the next few days, and the system
is forecast to become a hurricane on Wednesday and continue
strengthening as it moves across the eastern Gulf of Mexico.
* Formation chance through 48 hours...high...90 percent.
* Formation chance through 7 days...high...90 percent.

The estimated minimum central pressure is 1004 mb (29.65 inches).
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Already forecasting 110 mph!

Potential Tropical Cyclone Nine Discussion Number   1
NWS National Hurricane Center Miami FL       AL092024
1100 AM EDT Mon Sep 23 2024

A broad area of low pressure over the northwestern Caribbean Sea
continues to produce disorganized showers and thunderstorms. While
some mid-level rotation is evident in visible satellite images,
surface observations and visible satellite images suggest the
low-level circulation remains broad and farther to the southwest.
Nonetheless, the system has a high chance of tropical cyclone
formation during the next day or two, and it is likely to bring
tropical storm conditions to land areas within the next 36 to 
48 hours. Therefore, the NHC is initiating Potential Tropical 
Cyclone advisories for this disturbance.

The initial motion is quite uncertain given the current lack of 
organization, but the best estimate is northward at about 5 kt. A 
gradual turn toward the northwest is expected during the next day or 
so, with the center passing through the Yucatan Channel and into the 
southern Gulf of Mexico. Thereafter, the system is forecast to 
accelerate northward across the eastern Gulf of Mexico within the 
flow between a digging deep-layer trough over the central United 
States and a ridge over the western Atlantic. This motion should 
bring the center of the system toward the northeastern Gulf Coast on 
Thursday. The track guidance agrees reasonably well on this 
scenario, and the initial NHC forecast lies near the simple and 
corrected consensus aids. Since the disturbance currently lacks a 
well-defined center, users are reminded that the average forecast 
track uncertainty is larger in these situations, and future track 
adjustments may be required. Given the large size of the 
tropical-storm-force wind field and fast forward speed that is 
forecast, storm surge, wind, and rainfall impacts will likely extend 
well away from the center, particularly to the east of the system.

While the system is currently broad and not well organized, the 
models suggest a more well-defined center should develop during the 
next day or so. Once the system becomes better organized and 
develops an inner core, the environmental and oceanic conditions 
appear favorable for significant strengthening. In fact, the DTOPS 
statistical guidance shows a 95 percent chance of a 65-kt increase 
in intensity during the next 72 h, and the hurricane regional models 
highlight the potential for strengthening to major hurricane 
intensity. Thus, the NHC forecast shows significant strengthening 
while the system moves across the eastern Gulf of Mexico, with a 
95-kt intensity in 72 h. While this forecast is aggressive, it lies 
near or slightly below the consensus aids, and future adjustments 
may be necessary.  An Air Force Reserve reconnaissance aircraft is 
scheduled to investigate the system this afternoon. 

FORECAST POSITIONS AND MAX WINDS

INIT  23/1500Z 17.6N  82.0W   25 KT  30 MPH...POTENTIAL TROP CYCLONE
 12H  24/0000Z 18.6N  82.4W   30 KT  35 MPH...TROPICAL CYCLONE
 24H  24/1200Z 19.5N  83.7W   40 KT  45 MPH
 36H  25/0000Z 20.6N  85.1W   50 KT  60 MPH
 48H  25/1200Z 22.1N  86.0W   65 KT  75 MPH
 60H  26/0000Z 24.2N  86.0W   85 KT 100 MPH
 72H  26/1200Z 27.1N  85.1W   95 KT 110 MPH
 96H  27/1200Z 34.0N  83.0W   35 KT  40 MPH...INLAND
120H  28/1200Z 38.5N  87.0W   20 KT  25 MPH...POST-TROPICAL

$$
Forecaster Reinhart
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14 minutes ago, stormtracker said:

I'm supposed to in Florida on Thursday, flying down that evening.  Destin, FL :weep:

My partner is supposed to fly out of Tallahassee on Friday morning.  Work related travel so not too much choice about when to leave. ☹️

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3 minutes ago, schoeppeya said:

Some pretty obvious westerly lower level flow on visible satellite. Looks like maybe centered under the convection at 80w 17N?

They initialized it at 17.6N, 82.0W, which is well to the WNW of that. We’ll see what recon finds this afternoon. This from the just released NHC discussion is probably relevant:

“While
some mid-level rotation is evident in visible satellite images,
surface observations and visible satellite images suggest the
low-level circulation remains broad and farther to the southwest.”
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GFS is pretty much the worse scenario for the southern Apps and Blue Ridge for significant flash flooding, only saving grace is how quickly it moves/dissipates . I'm also looking at some signs of a predecessor rain event somewhere in GA, TN, NC or Alabama. Models are hinting at this too. 

qpf_acc-imp.us_ma (15).png

qpf_acc-imp.us_ma (16).png

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2 minutes ago, wthrmn654 said:

Lol OK so if I understand it correctly cyclones have a # and ptcs have numbers 

So if say the ptc is #5 if it becomes a cyclone and it's say the 6th one of the season it would be 06L (name)

 

Gotcha

PTC 9 will become Helena 09L, PTC 8 never became a tropical storm so 08L is unused this year for tropical storms… hope that clears things up!

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