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Major Hurricane Helene


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1 minute ago, BoulderWX said:

Glad to see this didn’t explode overnight but seems like it’s getting its act together this AM. prayers and best wishes for all in its path. Will be a fascinating day of tracking. 

On the no explosion thing, this hurricane has improved in structure quite rapidly. I mean, about 14 hours ago it had very little convection around the eye. 12 hours ago it was a ragged spirally mess due to dry air etc.  I think the rI is trivial compared to the structural stuff. It's just whether there is enough time left, and there seems to be, and not enough time for anything but strengthening.

 

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1 hour ago, WxWatcher007 said:

Latest VDM now shows a closed circular eye at 32nm diameter. 8°C temperature contrast. Last VDM had concentric eyewalls open in the NE with the outer eyewall also at 32nm and a 6° temp contrast.

Would like to see an even more organized eye at the next pass to know these changes have taken root (though it looks like it has). 
 

Edited to add: the western side looks weak but the eastern half is looking robust on both IR and recon.

Open to the west now. 

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Atlanta still sitting on the fence between a real nasty hit and more of a nuisance. The official forecast would point to more of a nuisance there for now with the center passing just east of the metro.

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6 minutes ago, eyewall said:

Atlanta still sitting on the fence between a real nasty hit and more of a nuisance. The official forecast would point to more of a nuisance there for now with the center passing just east of the metro.

Yeah I think ATl and perhaps TLH dodged one. West side of this will certainly be weaker I think. 

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More east trending by HAFS-A, B and HMON. All three now cross 84W before making landfall, which puts them in western Taylor County. 

Also fascinating to note that the Wednesday 8 pm advisory "center track line" is, at 5 a.m. Thursday, the western boundary of the cone. 

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3 minutes ago, CoastalWx said:

Yeah I think ATl and perhaps TLH dodged one. West side of this will certainly be weaker I think. 

Really hoping this is the case because as of yesterday it looked like a worst case scenario for both areas. Way too early to tell but if they can remain on the west side, that would be a saving grace. Regardless, I think it’s way more than a nuisance either way, but will be *less* devastating if the can remain on the western side. 

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Just now, beanskip said:

More east trending by HAFS-A, B and HMON. All three now cross 84W before making landfall, which puts them in western Taylor County. 

Also fascinating to note that the Wednesday 8 pm advisory "center track line" is, at 5 a.m. Thursday, the western boundary of the cone. 

If it can get east of Tallahassee that would be great news for them. Very little time for it to weaken before reaching there. Maybe there’s a “sweet spot” this can get to before it trends so far east the effects on Tampa Bay get much worse. 

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Just now, BoulderWX said:

Really hoping this is the case because as of yesterday it looked like a worst case scenario for both areas. Way too early to tell but if they can remain on the west side, that would be a saving grace. Regardless, I think it’s way more than a nuisance either way, but will be *less* devastating if the can remain on the western side. 

I was never really sold on the west of TLH  to ATL tracks though. I did get a little nervous when those tropical models were stubborn, but it looks like they’ll tick  east enough to avoid worst-case.

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3 minutes ago, BoulderWX said:

Really hoping this is the case because as of yesterday it looked like a worst case scenario for both areas. Way too early to tell but if they can remain on the west side, that would be a saving grace. Regardless, I think it’s way more than a nuisance either way, but will be *less* devastating if the can remain on the western side. 

The 925mb winds are fairly unimpressive on the west side of this once it reaches ATL’s latitude.  I could see them not even hitting 40kts if this passes 30-50 miles east of them.  There isn’t a big high to the north over the Oh Valley or Midwest so you don’t really have anything aiding the pressure gradient with the storm once it gets 100 miles or more inland so really only near and barely east of the center would likely see winds capable of very nasty damage but ATL itself even with 35-40kts could see probably a few hundred thousand lose power 

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Still have time for wobbles and changes west or east. See the image from the poster yesterday that had a mean 12 hour track error of 22 miles. It’s nothing in the global scheme of things but makes a huge difference locally. 

I didn’t buy the west tracks either but I won’t feel confident until hours from now.

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2 hours ago, MattPetrulli said:

Thought so too, but NHC is still using the catastrophic wind wording which is used for category 4+ only so I think it's just the forecast point.

What do they have to gain by removing that at this point??

Zilch....an immense amount to lose.

I'm waiting to hear @Randomgirl's thoughts...

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Maximum sustained winds have increased to near 100 mph (155 km/h) 
with higher gusts.  Additional strengthening is forecast, and Helene 
is expected to be a major hurricane when it reaches the Florida Big 
Bend coast this evening.  Weakening is expected after landfall, but 
Helene's fast forward speed will allow strong, damaging winds, 
especially in gusts, to penetrate well inland across the 
southeastern United States, including over the higher terrain of the 
southern Appalachians.

Hurricane-force winds extend outward up to 60 miles (95 km) from
the center and tropical-storm-force winds extend outward up to 345
miles (555 km). The Key West Naval Air Station recently reported
sustained winds of 41 mph (66 km/h) and a wind gust of 55 mph (89
km/h).  An observation in Sand Key recently reported sustained 
winds of 45 mph (72 km/h) and a gust to 58 mph (93 km/h).

The estimated minimum central pressure based on data from the 
NOAA and Air Force Reserve Hurricane Hunter aircraft is 960 mb 
(28.35 inches).

 

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3 minutes ago, buckeyefan1 said:

Indeed. MBY is up to 5” and counting, while those just to my north are reporting almost 7” :flood:

 

Just now, BretWx said:

Almost 8in here so far outside of Hendersonville, NC. Roads closing all over the place.

It's going to get pretty bad there. Hate to say it.

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