The Wild Week Ahead

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Honeyko

The Wild Week Ahead

#1 Postby Honeyko » Mon Sep 24, 2007 9:32 am

Image

With the equinox signaling the sun crossing the equator and the fatter portion of the equatorial atmospheric heat bulge sagging south, lapse-rates are steepening and the caps are eroding....

Four features with convective swirls this morning:

#1 is the fellow in the Gulf; drifting NNW at present. Banding developing rapidly.
-- completely unofficial forecast: 90% chance TS; 75% Hu before landfall in S. La.
...potential to intensify explosively into major hurricane a la Opal. Has more running room than Humberto, is moving slower, and isn't a third over land to start with. GoM not cooled by cold-fronts yet, and warm, humid continental airmass won't dry system out appreciably before impact. Portions La could pick up over foot of rain in days leading up.

#2 is over Barbados, moving WNW. Has more organization but fewer CB than Sat.
-- completely unofficial forecast: 33% chance TS; 33% Hu before western Caribbean. This either croaks or gets mean.

#3 is behind #2, at 15N/48W; tiny but vigorous swirl with small blob of CBs.
...may have a chance, but is likely to be cannibalized by #4's expansive inflow

#4 is the most impressive-looking mid-Atlantic system this year; possibly a TS already.
...good chance of becoming a long-lived, maxi-state major hurricane; low enough starting position to threat leeward islands if a WNW heading, but will have to thread a lot of needles to reach the US.
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Re: The Wild Week Ahead

#2 Postby Sanibel » Mon Sep 24, 2007 9:47 am

Unexpected last hurrah for Cape Verde (and then some from the looks of it).
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Honeyko

#3 Postby Honeyko » Mon Sep 24, 2007 10:03 am

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Steve
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#4 Postby Steve » Mon Sep 24, 2007 10:51 am

Wow. That center tucked right in to the SW of the convection. I was rolling my eyes when you gave it a 90% shot at a named storm, 75% hurricane. I was more like 10% TS, 1% hurricane until looking at that loop. Interesting next day or two IMHO whether something forms or not. Big push from the E and SE with the ridge building back in.

Steve
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Honeyko

#5 Postby Honeyko » Mon Sep 24, 2007 12:10 pm

11AMs are out, and no new TDs for either #1 or #4.

(How can you not label this a TD?)
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#6 Postby KWT » Mon Sep 24, 2007 12:22 pm

96L looks like a banker for development in the next 24-48hrs, 94L also looking fairly solid though there are slight uncertainties in regards of shear levels, it has eased down but I want to see what its like in 12hrs time.
97L is getting sheared right now so I don't think short term development is likely but it does need to be watched in the Caribbean, most models are developing something from this in the eastern Caribbean but the big uncertainty has to be the shear levels.

By the way, I reckon 96L would have been upgraded if it was in the Caribbean or Gulf of Mexico, as we saw with TD10...
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Re: The Wild Week Ahead

#7 Postby Praxus » Mon Sep 24, 2007 7:35 pm

Now, the forecasts are pretty bullish for each system. Gonna be interesting to see what the morning brings!

I wonder if we may eventually see two simultaneous hurricanes out of this..
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Honeyko

#8 Postby Honeyko » Tue Sep 25, 2007 2:43 pm

Update:

Image

See also.

My #4 (see first post) is now Karen. Nice two-syllable "killer female" hurricane name. Potentially very photogenic, full-evolved high-end cat-4 in three or four days. Models predict fairly NW/N slant after few more days of WNW, but there's an established track record of storms moving fast and left of models in this region this year. Virgin Islands will have to sweat this one's potential track for many days.

My #1 (94L) moved SW (rather than north) last night as the mid-level circulation got carted off by main ridge steering flow while the LLCC moved aside. Movement now appears stationary once again, with CB wrapping around. Cold front diving into central TX will play factor in strength of high over southeast US.

#2 (97L) is looking like a stretched-out wave progressing NW into the teeth of shear. 12Z GFDL forecasts hitting every single island in the Greater Antilles, with a possibly still-identifiable low center popping out near the Florida Keys at the end of the run. Puerto Rico radar will shortly determine whether or not there's an LLCC hidden under the anvils.

#3 (not invested) is still hanging on as a distinct, tight swirl. Movement slightly south of due west. Mostly convection-free (stifled by subsidence from 97L?) at present, and will need to fire CB tonight in order to stay alive. Could be the "sleeper" storm of the bunch if Karen goes fishing and 94L moves into Mexico without any impact.
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Honeyko

Re: The Wild Week Ahead

#9 Postby Honeyko » Thu Sep 27, 2007 10:39 pm

#1 is the fellow in the Gulf; drifting NNW at present. Banding developing rapidly.
-- completely unofficial forecast: 90% chance TS; 75% Hu before landfall in S. La.

TS...check!
Hu...check!
La... uhm...
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