ATL: TROPICAL LOW ex-FRED (ex-07L)

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Emmett_Brown
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#1641 Postby Emmett_Brown » Mon Sep 21, 2009 8:37 am

The shear has really dropped off as of 12z:

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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1642 Postby Air Force Met » Mon Sep 21, 2009 8:40 am

wxman57 wrote:There's no evidence of a surface circulation center in the surface obs around what's left of Fred. Pressures near the western edge of the convection are about 1019mb.

That said, the GFS does indicate an upper-level ridge briefly building over Fred's remnants tonight and tomorrow morning. I can see some signs that shear is already beginning to relax over the area of storms. If the convection can persist, then it may be able to regenerate a surface circulation later today or tonight. But with a deep trof to its east and a strengthening ridge over the Gulf, wind shear should increase quite significantly across the SW Atlantic by Wednesday morning. Anything there would be ripped apart.


There's evidence in the morning vis. It might not be at the sfc (although it looks like it would be)...but there is certainly a LLC in the morning HR vis loop.
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1643 Postby Blown Away » Mon Sep 21, 2009 8:43 am

I don't know if it is the convection expanding but it looks like ex Fred is moving WSW??
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1644 Postby PTrackerLA » Mon Sep 21, 2009 8:49 am

Fred has another life, looks pretty impressive this morning. A stall could make things very interesting.
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1645 Postby BigA » Mon Sep 21, 2009 8:57 am

A southwest motion looks like it will take Fred into some pretty favorable condititions.

The question is- can the convection sustain?
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#1646 Postby OuterBanker » Mon Sep 21, 2009 9:06 am

Geeze, Fred has died and come back to life more than any character on the Guiding Light in it's 72 year history.

Too bad Fred wasn't on the Guiding Light because it would still be on the air.

Will Fred just die?

Will Fred grow up to be a hurricane?

Will Fred haunt Florida until the end of the season?

Stay tuned for "As the Storm Turns"
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1647 Postby jpigott » Mon Sep 21, 2009 9:07 am

cloud tops look to be warming a little . . . let's see if ex-Fred can maintain the convection through the day

http://rammb.cira.colostate.edu/ramsdis ... _floater_2
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1648 Postby emeraldislencguy » Mon Sep 21, 2009 9:09 am

what are the odds that Fred could become a tropical storm or hurricane again
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1649 Postby wxman57 » Mon Sep 21, 2009 9:10 am

Air Force Met wrote:
wxman57 wrote:There's no evidence of a surface circulation center in the surface obs around what's left of Fred. Pressures near the western edge of the convection are about 1019mb.

That said, the GFS does indicate an upper-level ridge briefly building over Fred's remnants tonight and tomorrow morning. I can see some signs that shear is already beginning to relax over the area of storms. If the convection can persist, then it may be able to regenerate a surface circulation later today or tonight. But with a deep trof to its east and a strengthening ridge over the Gulf, wind shear should increase quite significantly across the SW Atlantic by Wednesday morning. Anything there would be ripped apart.


There's evidence in the morning vis. It might not be at the sfc (although it looks like it would be)...but there is certainly a LLC in the morning HR vis loop.


I can't see much of anything on the visible loop. Do you mean way NW of the convection by 30.8N/75W? There's sort of a broad open swirl there. I can see low clouds moving ENE-E along 30N (west of the convection) from 76W-74W. A report nearby had 1017.5mb pressure. Can't see anything to indicate an LLC near the convection, however.

Here's a GARP plot from 13Z to show the observation near where I see some evidence of low clouds circling. Yellow arrows indicate low cloud movement

Image
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1650 Postby Air Force Met » Mon Sep 21, 2009 9:19 am

wxman57 wrote: I can't see much of anything on the visible loop. Do you mean way NW of the convection by 30.8N/75W? There's sort of a broad open swirl there. I can see low clouds moving ENE-E along 30N (west of the convection) from 76W-74W. A report nearby had 1017.5mb pressure. Can't see anything to indicate an LLC near the convection, however.


I would put the center of the broad low near 30/74. There is low level inflow headed ENE at 29/74. I would not call it way NW of the convection as the westerly inflow is under the cirrus shield. Looks like an elongated e-w low with the eastern part of the low being near the convection.

The pressures are high...but they are about 4 MB lower in the area the the pressures around them. Wouldn't be the highest pressures ever observed on a TD (if it were to get better formed...not saying it is now).

http://wwwghcc.msfc.nasa.gov/cgi-bin/get-goes?satellite=GOES-E%20CONUS&lat=30&lon=-75&info=vis&zoom=1&width=2800&height=2000&type=Animation&numframes=8&map=latlon
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1651 Postby Aric Dunn » Mon Sep 21, 2009 9:20 am

wxman57 wrote:
Air Force Met wrote:
wxman57 wrote:There's no evidence of a surface circulation center in the surface obs around what's left of Fred. Pressures near the western edge of the convection are about 1019mb.

That said, the GFS does indicate an upper-level ridge briefly building over Fred's remnants tonight and tomorrow morning. I can see some signs that shear is already beginning to relax over the area of storms. If the convection can persist, then it may be able to regenerate a surface circulation later today or tonight. But with a deep trof to its east and a strengthening ridge over the Gulf, wind shear should increase quite significantly across the SW Atlantic by Wednesday morning. Anything there would be ripped apart.


There's evidence in the morning vis. It might not be at the sfc (although it looks like it would be)...but there is certainly a LLC in the morning HR vis loop.


I can't see much of anything on the visible loop. Do you mean way NW of the convection by 30.8N/75W? There's sort of a broad open swirl there. I can see low clouds moving ENE-E along 30N (west of the convection) from 76W-74W. A report nearby had 1017.5mb pressure. Can't see anything to indicate an LLC near the convection, however.

Here's a GARP plot from 13Z to show the observation near where I see some evidence of low clouds circling. Yellow arrows indicate low cloud movement

Image




ummmm... your cross hairs are quite off there buddy...
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1652 Postby storms NC » Mon Sep 21, 2009 9:21 am

Blown_away wrote:I don't know if it is the convection expanding but it looks like ex Fred is moving WSW??


It is the convection you see moving. It is still moving W-NW
http://www.ssd.noaa.gov/goes/east/carb/loop-wv.html
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1653 Postby Dean4Storms » Mon Sep 21, 2009 9:23 am

emeraldislencguy wrote:what are the odds that Fred could become a tropical storm or hurricane again


I'd say a TS @ 10%
Hurricane @ 1%
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1654 Postby tolakram » Mon Sep 21, 2009 9:24 am

Air Force Met wrote:I would put the center of the broad low near 30/74. There is low level inflow headed ENE at 29/74. I would not call it way NW of the convection as the westerly inflow is under the cirrus shield. Looks like an elongated e-w low with the eastern part of the low being near the convection.

The pressures are high...but they are about 4 MB lower in the area the the pressures around them. Wouldn't be the highest pressures ever observed on a TD (if it were to get better formed...not saying it is now).

http://wwwghcc.msfc.nasa.gov/cgi-bin/get-goes?satellite=GOES-E%20CONUS&lat=30&lon=-75&info=vis&zoom=1&width=2800&height=2000&type=Animation&numframes=8&map=latlon


I can see the circulation in that loop, and it looks to be very close to where the latest convection is overtopping. I think (which doesn't mean much) I see clouds heading south just west of that location. I wouldn't call it well defined, but something looks to be happening.

Fred, the punk, just won't quit.
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1655 Postby Aric Dunn » Mon Sep 21, 2009 9:25 am

Air Force Met wrote:
wxman57 wrote: I can't see much of anything on the visible loop. Do you mean way NW of the convection by 30.8N/75W? There's sort of a broad open swirl there. I can see low clouds moving ENE-E along 30N (west of the convection) from 76W-74W. A report nearby had 1017.5mb pressure. Can't see anything to indicate an LLC near the convection, however.


I would put the center of the broad low near 30/74. There is low level inflow headed ENE at 29/74. I would not call it way NW of the convection as the westerly inflow is under the cirrus shield. Looks like an elongated e-w low with the eastern part of the low being near the convection.

The pressures are high...but they are about 4 MB lower in the area the the pressures around them. Wouldn't be the highest pressures ever observed on a TD (if it were to get better formed...not saying it is now).

http://wwwghcc.msfc.nasa.gov/cgi-bin/get-goes?satellite=GOES-E%20CONUS&lat=30&lon=-75&info=vis&zoom=1&width=2800&height=2000&type=Animation&numframes=8&map=latlon


Yeah I agree, My earlier estimate of 30.4 73 is in line with yours. Its clearly elongated but that is typical of systems under going center relocation which is likely what will happen with the deeper convection.
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#1656 Postby Dean4Storms » Mon Sep 21, 2009 9:26 am

Looks like the low is trying to consolidate at the NW area of the convective blob for lack of a better word. If that convection keeps ongoing in that area it could close off and deepen IMO with shear relaxing and very warm SST's I do not see anything holdiing it back now.
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1657 Postby tolakram » Mon Sep 21, 2009 9:28 am

How about a picture from that loop.

Image
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1658 Postby Dean4Storms » Mon Sep 21, 2009 9:29 am

tolakram wrote:How about a picture from that loop.

Image



Note that new convection popping just above the number 30 in that pic, convection looks to be trying to sustain this time! :eek:
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1659 Postby Aric Dunn » Mon Sep 21, 2009 9:30 am

Pretty straight forward.. center approximately 30.24° N 73.80°

Image
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Re: ATL: TROPICAL LOW ex-FRED (ex-07L)

#1660 Postby Aric Dunn » Mon Sep 21, 2009 9:32 am

Dean4Storms wrote:
tolakram wrote:How about a picture from that loop.

Image



Note that new convection popping just above the number 30 in that pic, convection looks to be trying to sustain this time! :eek:


hehe.. you beat me to it.. :P

your Arrows are better than my ugly lines :(
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