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Tropical Major Hurricane Florence

Nothing big here, but at least it shows FFC is watching and waiting to see what Florence does next.

After Wednesday, the forecast will greatly depend on the forecast
track of Tropical Storm Florence. Florence is forecast to become
a Major Hurricane as it moves across the western Atlantic
later Tuesday and beyond. The European model now takes Florence
to the upper portion of the SC coast late Thursday and then to the
central Appalachians or so. The GFS take Florence to the Outer Banks
of NC late Thursday or early Friday. These 2 tracks will make a
difference in how the forecast plays out and we will just have to
watch and monitor.
https://forecast.weather.gov/produc...FC&product=AFD&format=CI&version=1&glossary=1
 
From the 11am discussion:
"The updated NHC track forecast is therefore very close to or slightly west of the previous forecast on days 4 and 5."
 
Dont see the NHC very often forecasting rapid intensification :eek:

A significant
phase of intensification is likely to begin by tonight, continuing
through Tuesday or Wednesday. In fact, the official intensity
forecast explicitly shows rapid intensification occurring between
24 and 48 hours from now, and Florence is expected to become a
major hurricane by Monday.
 
863
WTNT41 KNHC 081453
TCDAT1

Tropical Storm Florence Discussion Number 37
NWS National Hurricane Center Miami FL AL062018
1100 AM AST Sat Sep 08 2018

Florence has undergone a dramatic structural evolution just within
the past 6 hours or so. Vertical shear has decreased just enough
for the storm to take on a more symmetric shape, with convection
developing in a ring around the low-level center, and an elongated
band wrapping around to the northeastern part of the circulation.
The convection has waned a little bit in intensity, however, due to
the presence of dry air, and Dvorak estimates support maintaining
an initial intensity of 55 kt for now. A NOAA P-3 aircraft is
approaching Florence now on a research mission and should provide
some useful data to better assess the storm's intensity.

Recent WindSat microwave data revealed that Florence has a
well-defined low-level ring in the 37-GHz channel, which tends to
be a harbinger of strengthening when environmental conditions are
favorable. Since vertical shear is decreasing and should be 10 kt
or less by later today, and Florence is heading toward a deeper
pool of warm water over the southwestern Atlantic, a significant
phase of intensification is likely to begin by tonight, continuing
through Tuesday or Wednesday. In fact, the official intensity
forecast explicitly shows rapid intensification occurring between
24 and 48 hours from now, and Florence is expected to become a
major hurricane by Monday. The HFIP Corrected Consensus (HCCA) and
the Florida State Superensemble (FSSE), both of which tend to do
well in these scenarios, are both near the upper end of the guidance
suite, especially through day 3. Even by days 4 and 5, the HWRF,
HMON, and ICON intensity consensus are near the top end of the
guidance, close to HCCA and FSSE. Given the signals in the
environment, and the solutions provided by these models, the NHC
intensity forecast shows Florence reaching category 4 intensity by
day 3 and maintains that through the end of the forecast period.

Florence's longer-term motion is 265/6 kt. The cyclone appears to
be slowing down as was expected, and this type of motion is likely
to continue for the next 24-36 hours. In fact, the track guidance
has slowed down during this period, and the updated NHC track
forecast is a little slower than the previous one. After 36 hours,
the most notable change in the models was a northeastward shift in
the 06Z GFS. However, that run appears to be an outlier from the
rest of the dynamical models, and its trend opposes the slight
westward shift noted in the HCCA and FSSE aids. The updated NHC
track forecast is therefore very close to or slightly west of the
previous forecast on days 4 and 5. The exact path of Florence as it
approaches the southeastern U.S. coastline will depend heavily on
the position and strength of the blocking high pressure that is
expected to develop north of Bermuda and extend westward over the
eastern U.S., and so far there has not been much more clarity on
those important details.

https://www.nhc.noaa.gov/text/refresh/MIATCDAT1+shtml/DDHHMM.shtml
 
A very key excerpt from the 11:00 AM discussion ...

The exact path of Florence as it approaches the southeastern U.S. coastline will depend heavily on
the position and strength of the blocking high pressure that is expected to develop north of Bermuda and extend westward over the eastern U.S., and so far there has not been much more clarity on those important details.

Key Messages:

1. Florence is forecast to be a dangerous major hurricane near the
southeast U.S. coast by late next week, and the risk of direct
impacts continues to increase. However, given the uncertainty in
track and intensity forecasts at those time ranges, it's too soon to
determine the exact timing, location, and magnitude of those
impacts.
2. Interests along the U.S. East Coast, particularly from north
Florida through North Carolina, should closely monitor the progress
of Florence ...
(E.S.)
In other words, folks ... we have a bit to go yet and hopefully someone of us is not just 24 hours out before things are clear (and by "clear" I don't mean nice sunny skies) ...
 
Interesting, every subtle differences can have huge implications
ForsythSnow said:
So the hurricane hunters are on their first pass and it already looks like it's stronger with pressure down around 990 mb and a wind maybe around 70 mph.
Click to expand...

Sent from my SM-G920V using Tapatalk
 
BHS1975 said:
What’s making it turn at the end that the euro/ukie is not seeing.


Sent from my iPhone using Tapatalk
Click to expand...
It's not a matter if what it is/isn't seeing, but more of which players are doing what. The GFS seems to be faster than the Euro with the entire playout, and that's what makes the difference.
 
Also looks like a different orientation of that high in the GFS doesn't build it back as far west as the euro.
ForsythSnow said:
It's not a matter if what it is/isn't seeing, but more of which players are doing what. The GFS seems to be faster than the Euro with the entire playout, and that's what makes the difference.
Click to expand...

Sent from my SM-G920V using Tapatalk
 
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