Definite uncertain future regarding 91L

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Stormsfury
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Definite uncertain future regarding 91L

#1 Postby Stormsfury » Tue Aug 12, 2003 6:30 pm

This is a large file (caution for those on dial-up: 2.6mb.)

Invest 91L earlier this afternoon ... :darrow: :darrow:

http://stormsfury1.com/Temp/91Laftloop.gif

You'll notice the outflow and a very rapid moving line moving north of due west over the northern end of the deep convection this morning and earlier we had a clear-cut LLC near 22.5ºN, 71º-73ºW ...

What concerns me now it the fact that the LLC is opening up. It's a low-level swirl ... NHC has still left the possibility of the LLS forming into a depression in the next 24 hours ...

The situation that occurs in the next 6-12 hours is key. IF convection re-initiates around the LLS tonight - the LLS will probably remain a dominant feature. However, if the LLS continues to unravel convectionless - the surface trough to the north has a better chance of closing itself off with some help of a MLC aiding this (uninterrupted moisture flow) ... this in turn would not be a re-formation, but an actual new formation given the 300 mile difference in distance - a totally separate LL entity - ...

Edit: Considering the fact the area of deep convection has good outflow and the convection continues to initiate there in that region and seems to be increasing in that area really has me concerned ... looking at the globals, the GFS dissipates the upper ridging around 25ºN, 70ºW as the large scale upper high (DOME) retrogrades and builds westward ...

PLEASE NOTE: whatever scenario plays out, the track of the system will likely be WEST! The strength of the mean layer ridging (hell, it's a DOME!)which is building in - close to 600DM in the Eastern US - ... this is key, because whichever scenario plays out will determine if Florida will a system pass to the south or a slightly stronger system crossing Florida...this is especially key later in the period to determine if we have a MX storm or a storm further upstream in the GOM towards TX ...
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Rainband

#2 Postby Rainband » Tue Aug 12, 2003 6:50 pm

Very interesting couple of days ahead!!!
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chadtm80

#3 Postby chadtm80 » Tue Aug 12, 2003 6:51 pm

Great thoughts SF... My head is spinning.. lol Why cant we just have a normal system?? Wait a min there is no such thing hehehe
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#4 Postby Stormsfury » Tue Aug 12, 2003 7:03 pm

Both scenarios support a WESTWARD track ... look at the large scale synoptic pattern for that ... Look at the Bermuda High and the high pressure back towards the Great Lakes merge and become a DOME ...

GFS depiction 24 hrs and 48 hrs
Image

Image

ETA depiction 24 hrs and 48 hrs
Image

Image

Can we say DOME? ...
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#5 Postby Tip » Tue Aug 12, 2003 7:23 pm

The Euro model sniffed out the dome far ahead of the US models - Another coup for the Euro.
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#6 Postby Stormsfury » Tue Aug 12, 2003 7:35 pm

Tip wrote:The Euro model sniffed out the dome far ahead of the US models - Another coup for the Euro.


Yep ... I knew about that DOME quite a while back with the retrogression of the Bermuda High/Great Lakes ... credit to DT/WxRisk ...

SF
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#7 Postby southerngale » Tue Aug 12, 2003 7:35 pm

Interesting post SF...thanks...I really appreciate when things are explained. I learn a lot from you guys. ;)
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#8 Postby Colin » Tue Aug 12, 2003 7:48 pm

Sure looks like a Florida threat to me! :o
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#9 Postby Tip » Tue Aug 12, 2003 7:49 pm

I second the credit to DT. He stayed with the Euro's idea of the coming dome against some intense pressure from other forecasters.
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