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re: Sally - Moving towards Georgia - Potential for Significant Flooding

Posted on 9/13/20 at 3:41 pm to
Posted by BRgetthenet
Member since Oct 2011
118252 posts
Posted on 9/13/20 at 3:41 pm to
Thanks. Figured.
Posted by Glock17
Member since Oct 2007
23143 posts
Posted on 9/13/20 at 3:45 pm to
Looks like a eastward shift on the 4pm
This post was edited on 9/13/20 at 3:46 pm
Posted by Duke
Dillon, CO
Member since Jan 2008
36494 posts
Posted on 9/13/20 at 3:46 pm to
quote:

The overall structure of Sally has not changed much since this
morning, but there has been a recent increase in convection near
and to the east of the center this afternoon. It appears that
the northwesterly shear is beginning to relax, and the increase in
convection near the center may be a harbinger of the expected
strengthening phase.
Air Force and NOAA Hurricane Hunter aircraft
that have been in the storm since the previous advisory have
reported a fairly stable central pressure of 996-998 mb, and recent
data from the NOAA aircraft still supports an initial intensity of
50 kt. Earlier ASCAT data have been helpful in analyzing the radius
of 34-kt winds, which has expand over the eastern semicircle.

Sally is forecast to move beneath a narrow upper-level ridge axis
through Monday and the expected decrease in shear should allow the
storm to strengthen. Since Sally is forecast to decelerate on its
approach to the northern Gulf coast, the system still has at least
another 36 h to take advantage of the expected conducive
environmental conditions. As a result, the NHC intensity forecast
continues to call for Sally to become a hurricane on Monday, with
additional strengthening likely until landfall.
The intensity
guidance has trended slightly lower this cycle, with the HMON model
now at the upper end of the guidance envelope. The reduction in the
statistical guidance is likely due to the fact that Sally has not
strengthened today and there is a persistence component to the
forecast from those models. The latest NHC intensity forecast is
similar to the previous advisory and lies a little above the latest
HFIP corrected consensus aid.


Recent satellite and aircraft fixes show that Sally continues to
move west-northwestward at about 10 kt. The tropical storm is
currently being steered around the southern portion of a mid-level
ridge to its northeast. Sally is forecast to reach the western
extent of the ridge on Monday, and a slower northwestward motion is
expected when the storm is near the north-central Gulf coast. The
steering currents are forecast to weaken further in a couple of days
as Sally rounds the western extent of the ridge and a slow northward
motion is expected during that time. By 72 hours, the cyclone
should begin to move somewhat faster toward the northeast as a
trough deepens to its west. As often occurs, there has been some
run-to-run variability among the various track models, and the
latest iterations of them have shifted eastward with a slower
forward speed. Despite the shifts of the individual models, the
latest consensus aids are only slightly north and east of the
previous NHC track through 60 hours, so only a small adjustment has
been made to the earlier official forecast through that time.
It is
important not to focus too much on these small track changes and
to the exact forecast track itself, as impacts are expected to
extend far from the center. Also, since there is still quite a
bit of model spread in both the location and timing of when the
center of Sally reaches the northern Gulf Coast, additional
adjustments to the track forecast are possible.


Regardless of Sally's exact landfall location and intensity, the
cyclone is expected to bring wind, storm surge, and rainfall hazards
to a large part of the north-central Gulf Coast. In particular,
Sally's slow forward speed near the coast will exacerbate the storm
surge and heavy rainfall threats.
Posted by SlidellCajun
Slidell la
Member since May 2019
16395 posts
Posted on 9/13/20 at 3:47 pm to


Intensity models
Posted by slackster
Houston
Member since Mar 2009
91838 posts
Posted on 9/13/20 at 3:48 pm to
quote:

lol you’re divorced?


Pretty frickin trashy baw


I know.

Remarried though, so not sure how that works. Once divorced, always divorced?
Posted by NorthEndZone
Member since Dec 2008
14278 posts
Posted on 9/13/20 at 3:48 pm to
quote:

FORECAST POSITIONS AND MAX WINDS

INIT 13/2100Z 27.8N 85.9W 50 KT 60 MPH
12H 14/0600Z 28.3N 87.3W 60 KT 70 MPH
24H 14/1800Z 28.7N 88.7W 70 KT 80 MPH
36H 15/0600Z 29.2N 89.6W 80 KT 90 MPH
48H 15/1800Z 29.8N 90.1W 60 KT 70 MPH...INLAND
60H 16/0600Z 30.7N 90.1W 45 KT 50 MPH...INLAND
72H 16/1800Z 31.8N 89.6W 30 KT 35 MPH...INLAND
96H 17/1800Z 33.5N 87.5W 25 KT 30 MPH...INLAND
120H 18/1800Z 34.5N 83.0W 20 KT 25 MPH...POST-TROP/REMNT LOW

$$
Forecaster Brown



Shifted east to right up the river into the city.
Posted by lsuman25
Erwinville
Member since Aug 2013
43294 posts
Posted on 9/13/20 at 3:49 pm to
slight east shift
Posted by SATNIGHTS
Red Stick
Member since Jan 2008
2485 posts
Posted on 9/13/20 at 3:50 pm to
Did I seriously just get a school closed announcement for Ascension tommorow?
Posted by jac1280
Member since Dec 2007
5380 posts
Posted on 9/13/20 at 3:50 pm to
Yep, and Tuesday will be closed too. Just haven’t announced it yet.
Posted by geauxtigers87
Louisiana
Member since Mar 2011
27420 posts
Posted on 9/13/20 at 3:51 pm to
What about new orleans schools?
Posted by ellunchboxo
G-Town
Member since Feb 2009
19474 posts
Posted on 9/13/20 at 3:53 pm to
Yes. It’s says for preparedness.

They’ll close Tuesday and Wednesday too.
Posted by Dominate308
South Florida
Member since Jan 2013
2895 posts
Posted on 9/13/20 at 3:54 pm to
At this point, what’s the difference between an open and closed school?
Posted by deuce985
Member since Feb 2008
27660 posts
Posted on 9/13/20 at 3:58 pm to
Watching Saints game. How's the storm looking? Still struggling?
Posted by NorthEndZone
Member since Dec 2008
14278 posts
Posted on 9/13/20 at 3:58 pm to
The shift east was slight but significant.

The 10 AM was roughly on a line from Lafitte to St. Rose to Laplace to Ponchatoula/Hammond.

The 4 PM is roughly on a line from Port Sulphur to Marrero to City Park to Mandeville/Covington.

Probably only about 10 to 15 mile shift. But with a smallish storm like Sally, that could be a big difference for the conditions in a specific area.
This post was edited on 9/13/20 at 4:05 pm
Posted by Duke
Dillon, CO
Member since Jan 2008
36494 posts
Posted on 9/13/20 at 3:59 pm to
quote:

Watching Saints game. How's the storm looking? Still struggling?




No change. It's a metaphor for the Saints offense so far.

Got water vapor up on the computer.and watching the game. The organization phase should start tonight imo.
Posted by Jim Rockford
Member since May 2011
105273 posts
Posted on 9/13/20 at 3:59 pm to
Hopefully the shift continues
Posted by geauxtigers87
Louisiana
Member since Mar 2011
27420 posts
Posted on 9/13/20 at 4:00 pm to
Nola public schools no in person learning until Wednesday at earliest
Posted by arseinclarse
Member since Apr 2007
35423 posts
Posted on 9/13/20 at 4:06 pm to
quote:

Nola public schools no in person learning


There’s a joke in here somewhere.


What’s the boards opinion about Nola being a direct hit? I trust y’all more that Margaret Orr.
Posted by geauxtigers87
Louisiana
Member since Mar 2011
27420 posts
Posted on 9/13/20 at 4:06 pm to
I'd trust Peej more than Margaret orr
Posted by QuietTiger
New Orleans
Member since Dec 2003
26256 posts
Posted on 9/13/20 at 4:06 pm to
quote:

to Marrero to City Park

Well, it'll be another Betsy moment for me, I get the eye again.
Perhaps the camp power will stay on and I can bail to it, maybe.
Y'all be safe.
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