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Hurricane Arthur


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What else is new we cant get a decent hurricane going in the atlantic. This basin just sucks the big one recent yrs. Everything is a struggle dry air,shear,vertical instability etc...

 

Can we just wait and see what happens without these weenie posts?

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So, the while the "eye" on radar is correct in being the center of the storm, it is not an eye by definition. The definition of an eye is:

We have criteria #1 met, which is the center, the problem comes with condition #2 which is that there is no eyewall at the moment, this is seen by looking at Infrared satellite and radar.  IF there was an eyewall we would have cold cloudtops and high echo tops on radar. However, we don't. IR temps are in the -40's and echotops from Melbourne are only in the mid-20's.

What we are seeing then is a different process from the definition of an eye. So what is happening now is that the wind surrounding the center of the circulation is throwing water droplets out from the center creating a "eye" where there are little/small water droplets left. Same thing happens on those mini-mery go rounds on playgrounds, any mass you put in the center will fly out to the outer rim. The same thing happens in real eye's too, but they have eye walls.

 

Thanks for explaining...

So we aren't there yet? Looks healthier than it has all day either way. Interested to see how this evolves over the next 24-48 hrs

 

K2puXOF.png

 

hxd9BYJ.png

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Lol every single strong TC goes through this stage of their life where convection axis-symmetrizes. That's what's happening now.

Is the center tilted? Maybe. Is that radar feature the low-level eye we consider the true eye?. No because the radar is looking too far aloft at this level. Could the low level eye be under this mid level eye feature? Possibly. We won't know till recon flies in.

It's wrong to assume there is no eye because the brightness temps are not considered cold enough. There have been plenty of Hurricanes with warmer cloud top temps.

However it's also wrong to assume there is a low level eye feature by looking at radar alone this far away until recon confirms.

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Down to 997MB with an open eyewall.

 

URNT12 KNHC 020642 CCA
VORTEX DATA MESSAGE AL012014
A. 02/06:07:20Z
B. 28 deg 09 min N
079 deg 08 min W
C. 850 mb 1397 m
D. 35 kt
E. 294 deg 27 nm
F. 021 deg 38 kt
G. 294 deg 24 nm
H. 997 mb
I. 17 C / 1524 m
J. 20 C / 1520 m
K. 6 C / NA
L. OPEN NW
M. C36

N. 12345 / 8
O. 0.02 / 1.5 nm
P. AF303 0401A ARTHUR OB 05 CCA
MAX OUTBOUND AND MAX FL WIND 53 KT 129 / 37 NM 06:19:30Z

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If Arthur becomes a hurricane (which seems rather likely), it will be the second earliest hurricane in 100 years to form in the w. Atlantic, north of 25N and west of 70W.  The only earlier one would be Able in late May, 1951.

 

Looking like a possible high end Cat.1 with a model or two getting up into Cat.2 territory.

 

Modeling has really taken SC out of play as far as Arthur's track.. but the Outer Banks need to pay really close attention.  What a bad weekend and set of decisions for those guys right to my North financially and safety wise... depending on ultimate speed of this thing.

 

aal01_2014070206_track_early.png

 

aal01_2014070206_intensity_early.png

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One full day

 

Here it is from a very wide perspective for two days; it isn't the clearest resolution of water vapor, but it is easy to see the most recent parts of cyclogenesis as well as the continuing presence of the western gulf low or overall large blocking/convolution area that has held the trough back for those two consecutive days.  It is a very dynamic image to see.

 

7_14watermvm.gif

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This short loop really shows the dramatic blocking/occlusion environment that has allowed cyclogenesis to take place and to continue.  By mid to late evening this same satellite view will possibly show partial resolution, or otherwise continued tension between all of these systems. 

 

1ekq41.jpg

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calm_days, you have to give better explanations of what we are looking at on those WV sat images. 'Tension', 'convolution', 'blocking', mean little and contribute even less to the understanding of the TC evolution. WV images usually are shown to highlight things like shear, upper level ventilation, dry air, or an overall picture of the conditions that lead to cyclogenesis, etc...in this latter case you need to explain how each of the most important features work in favor/against a TC or cyclogenesis...eg. "ULL pinching off from the Central Atlantic trough, will lead to a retreat of the aforementioned trough who has been plaguing the MDR with shear, and also provide ventilation to the TW currently at 45W as the ULL drops SW...". 

 

Hopefully I'm not coming off as rude, I'm honestly trying to enhance our level of discussions with richer posts from every member.

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