Bonnie Advisories

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ColdFront77

#1341 Postby ColdFront77 » Tue Aug 10, 2004 10:47 am

Dan wrote:the longer that Bonnie shows any westward movement, whether that is NW or WNW, the more likely it will come ashore farther west along the gulf coast.

The NHC is still conifdent on a Florida Panhandle landfall, you can tell that by looking at the forecast track. But, if that is to indeed occur, Bonnie is going to have to starting going in a Northeast direction in the next 12-18 hours, or it may not be able to recurve quick enough to hit Florida. I'm thinking at this time that an Alabama or maybe Mississippi landfall could occur. Look for NHC to adjust theit forecast track quite a bit at the 5pm advisory, especially compared to the 11am track and especailly because they are sending a plane out to investigate the atmosphere surrounding the storm.

Dan, I feel the majority here agrees with you. IMO, the system's turns "can easily" cause a landfall around the same place, be it more likely further west
and potentially east, it obviously depends on things around which means a further westward movement now really shouldn't ultimately determine where the
system tracks from this point forward.
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#1342 Postby Stormchaser16 » Tue Aug 10, 2004 10:47 am

Yes good shot

IT seems the center is trying to turn north, but because of the continuous northerly shear, the convection is being held back to the SW......... expect a weakening phase to occur until the northerly shear can relax and allow convection to move back over the circulation OR till convection forms back over the circ.
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#1343 Postby Baytown Bug » Tue Aug 10, 2004 10:49 am

Looks like the center is semi-exposed again on the northern edge of the cloud cover. It looks to me as if the storm is still moving NW. I'm wondering now if Bonnie is getting ready to pull an Alex and become more symmetrical as the northern shear ebbs as a short-wave approaches from the west. One thing that worries me right now is the mention of a deep warm-water eddy in the NHC discussion. That's what happened when Opal intensified so rapidly overnight.
Last edited by Baytown Bug on Tue Aug 10, 2004 10:50 am, edited 1 time in total.
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#1344 Postby rbaker » Tue Aug 10, 2004 10:50 am

what we are seeing is the convection moving off to the west and llc moving out north, which means northerly shear is temp. weakening storm, question is once it gets futher north and in the w to e flow will thunderstorm activity fire up, or will we have a convection free swirl?
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#1345 Postby sponger » Tue Aug 10, 2004 10:52 am

The Pan handle is starting to become a hurricane magnet like the outer banks!
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Where is Bonnie's center?

#1346 Postby Stormcenter » Tue Aug 10, 2004 10:57 am

O.K. click on the loop below and speed it up.
I'm having a hard time locating Bonnie's "actual"
center. It's almost like you see two different spins.

http://www.ssd.noaa.gov/PS/TROP/DATA/RT ... -loop.html
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#1347 Postby Thunder44 » Tue Aug 10, 2004 11:03 am

Bonnie's center is clear to me, especially in that last frame where it's partially exposed. I only see one center.
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ColdFront77

#1348 Postby ColdFront77 » Tue Aug 10, 2004 11:05 am

One center, appearance of two circulations to some. :)
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#1349 Postby Dean4Storms » Tue Aug 10, 2004 11:07 am

Actually you are, the LLC is now moving more NNW as the mid-UL is still moving off to the west with the UL to the SW. The LLC is right at the edge of the UL overcast and is close to being exposed. She has become very disorganized which was somewhat expected in that the smallest changes will disrupt a small storm such as her, such as a change in direction with shear present. But once she begins to get caught up in the trough later today she will have a window of favorability of futher deepening.
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#1350 Postby Dean4Storms » Tue Aug 10, 2004 11:11 am

This may help, note the center is on the edge of the bubbling convection near the north end of the main cloud mass.......

http://www.rap.ucar.edu/weather/satelli ... &itype=vis
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#1351 Postby Stormcenter » Tue Aug 10, 2004 11:11 am

Dean4Storms wrote:Actually you are, the LLC is now moving more NNW as the mid-UL is still moving off to the west with the UL to the SW. The LLC is right at the edge of the UL overcast and is close to being exposed. She has become very disorganized which was somewhat expected in that the smallest changes will disrupt a small storm such as her, such as a change in direction with shear present. But once she begins to get caught up in the trough later today she will have a window of favorability of futher deepening.



Thank you for the explanation.
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Recon observations of Bonnie and Charley

#1352 Postby cycloneye » Tue Aug 10, 2004 11:17 am

000
URNT11 KNHC 101530
97779 15304 30239 87200 57200 99005 56741 /4592
RMK AF966 0103A CHARLEY OB 05



They haved started the mission to Charley from Biloxi but they are now still in the GOM well away at 23.9n-87.2w.Post the data from recon in this thread.
Last edited by cycloneye on Tue Aug 10, 2004 12:02 pm, edited 1 time in total.
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Bonnie enlarging?

#1353 Postby Dean4Storms » Tue Aug 10, 2004 11:18 am

Bonnie appears to be reacting to the deepening pressure seen this morning. Just like a large Cat.5 Eyewall will eventually collapse on itself it looks to me that this tiny eye did the same thing this AM. If I'm not mistaken it looks like Bonnie's windfield has spread out, especially northward at the same time this contraction occured the LLC change direction and between all this and the shear may have weakened her temporarily. I could be wrong but don't be surprised if she gets larger and intensifies greatly later today/tonight.
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#1354 Postby Thunder44 » Tue Aug 10, 2004 11:21 am

Dean4Storms wrote:This may help, note the center is on the edge of the bubbling convection near the north end of the main cloud mass.......

http://www.rap.ucar.edu/weather/satelli ... &itype=vis


It already looks like t-storms are developing over the center again.
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#1355 Postby tallywx » Tue Aug 10, 2004 11:21 am

Her center is under northerly shear right now from that upper-level anticyclonic flow off to her west. Looking at the latest upper air plots and forecasts, it looks like this flow quickly changes to a W-E flow above 25N due to the approaching trough. She may have rough going as she bucks the northerly shear until 25N, after which we may see a rearranging of convection and form as she gains favorable directionality in relation to the upper-level flow.
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#1356 Postby tallywx » Tue Aug 10, 2004 11:22 am

Yes, the center continues to fire off thunderstorms. The northerly shear is not oppressive...not that strong at all. It's only because the system is so small that it's so receptive to these conditions.
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#1357 Postby MGC » Tue Aug 10, 2004 11:23 am

You could be right Dean. Once Bonnie gets a little futher north the shear should really drop off and the GOM is like a bath. I see a good opertunity for intensification...MGC
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#1358 Postby vacanechaser » Tue Aug 10, 2004 11:25 am

lets just remember alex last week... when everyone thought the wind shift front eh trough and cold front was shearing alex, it aided in intensifying him... i think you are seeing the effects of the pull on bonnie to start making that turn to the north soon... once it does and it turn more northeast, it really is not shear anymore... the system will be moving with the wind... not against it... then it becomes more of an out flow jet than a shearing wind... bastardi has been hammering this for years.. he was right with alex.. 100mph off hatteras then look at it in the northern atlantic... 120mph...

i am sure someone will disagree.. i thought of it that way too.. shear.. until alex.... and i was there... iknow.. lol.. just something to digest... lets see what happens with the convection a little later...
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#1359 Postby dixiebreeze » Tue Aug 10, 2004 11:26 am

tallywx wrote:Yes, the center continues to fire off thunderstorms. The northerly shear is not oppressive...not that strong at all. It's only because the system is so small that it's so receptive to these conditions.


True, but the shear is forecast to become much stronger by Thursday and Friday.
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Re: Recon observations of Charley

#1360 Postby jlauderdal » Tue Aug 10, 2004 11:28 am

cycloneye wrote:000
URNT11 KNHC 101530
97779 15304 30239 87200 57200 99005 56741 /4592
RMK AF966 0103A CHARLEY OB 05



They haved started the mission to Charley from Biloxi but they are now still in the GOM well away at 23.9n-87.2w.Post the data from recon in this thread.


they should make a little detour to the SW release some Dropsondes and continue to the SE towards Charlie.
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