ATL: GERT - Post-Tropical - Discussion

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Re: ATL: GERT - Hurricane - Discussion

#1461 Postby Kazmit » Tue Aug 15, 2017 7:40 am

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Re: ATL: GERT - Hurricane - Discussion

#1462 Postby TheStormExpert » Tue Aug 15, 2017 7:47 am

:uarrow: Has the fist of doom look.
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Re: ATL: GERT - Hurricane - Discussion

#1463 Postby Ivanhater » Tue Aug 15, 2017 8:51 am

Gert looking good...and to think, all the model including the Euro dropped this :wink:
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Re: ATL: GERT - Hurricane - Discussion

#1464 Postby cycloneye » Tue Aug 15, 2017 9:38 am

Hurricane Gert Discussion Number 11
NWS National Hurricane Center Miami FL AL082017
1100 AM EDT Tue Aug 15 2017

Northerly shear of about 20 kt was inhibiting Gert overnight. A
pair of microwave passes around 0900 UTC showed that the mid-level
center was displaced about 20 n mi south-southeast of the
low-level center. Since the time of the earlier microwave passes,
outflow in the northwest quadrant has become re-established,
suggesting that the shear may be lessening. The initial intensity
has been held at 65 kt based on the latest Dvorak classification
from TAFB. Environmental diagnostics from SHIPS indicate that the
shear should continue to decrease for about the next 24 h, which
should allow for a brief window of intensification. The GFS, ECMWF,
and UKMET all indicate that extratropical transition will begin
sometime between 36 h and 48 h, while the hurricane crosses a strong
SST gradient and the shear increases above 30 kt. Gert is forecast
to become fully extratropical about a day later.

The initial motion is 015/9 kt. Gert has finally begun to round
the western edge of the subtropical ridge, and should begin
accelerating northeastward later today. The track guidance is
tightly clustered for the first 48 h of the forecast. Beyond two
days, there is some along-track spread in the models. The GFS
forecasts that Gert will move faster and remain separated from a
large extratropical low for nearly 5 days, while the ECMWF and UKMET
forecast Gert to move slower, causing it to merge with the
extratropical low sooner. The official forecast splits the
difference between these scenarios for now and indicates that Gert
will be absorbed by the extratropical low shortly after 96 h.

Swells from Gert are expected to spread northward along the
mid-Atlantic coast of the United States during the next few days.
These swells are likely to produce dangerous surf and rip current
conditions. Please consult products from your local National
Weather Service office.


FORECAST POSITIONS AND MAX WINDS

INIT 15/1500Z 32.8N 72.0W 65 KT 75 MPH
12H 16/0000Z 34.4N 70.7W 70 KT 80 MPH
24H 16/1200Z 36.7N 67.0W 75 KT 85 MPH
36H 17/0000Z 38.9N 61.2W 75 KT 85 MPH
48H 17/1200Z 41.3N 53.3W 70 KT 80 MPH
72H 18/1200Z 48.8N 38.3W 60 KT 70 MPH...POST-TROP/EXTRATROP
96H 19/1200Z 54.0N 34.5W 45 KT 50 MPH...POST-TROP/EXTRATROP
120H 20/1200Z...DISSIPATED

$$
Forecaster Zelinsky
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Re: ATL: GERT - Hurricane - Discussion

#1465 Postby ThetaE » Tue Aug 15, 2017 9:45 am

The last few hours of satellite look really good, with what looks like an eye feature becoming apparent before getting obscured by some hot towers firing near the center.

SLIDER Visible Archive: http://col.st/vUqPo
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Re: ATL: GERT - Hurricane - Discussion

#1466 Postby SouthDadeFish » Tue Aug 15, 2017 10:15 am

Gert is intensifying this morning, with numerous convective bursts in the eyewall, and the eye is becoming more apparent on visible satellite imagery:

Image
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Re: ATL: GERT - Hurricane - Discussion

#1467 Postby northjaxpro » Tue Aug 15, 2017 10:18 am

Gert is looking quite impressive this morning!
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Re: ATL: GERT - Hurricane - Discussion

#1468 Postby gfsperpendicular » Tue Aug 15, 2017 10:33 am

Image

Eye becoming better defined. I don't want to overuse the word, but are these first steps to becoming annular? Looks like it's shedding that band to the SE.
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Re: ATL: GERT - Hurricane - Discussion

#1469 Postby Siker » Tue Aug 15, 2017 10:33 am

Beautiful outflow this morning.
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Re: ATL: GERT - Hurricane - Discussion

#1470 Postby WAcyclone » Tue Aug 15, 2017 10:52 am

The ocean surface can be seen through the eye:

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Re: ATL: GERT - Hurricane - Discussion

#1471 Postby weathaguyry » Tue Aug 15, 2017 10:57 am

:uarrow: Pretty good for a 65kt Hurricane, let's see if Gert can take advantage of the lighter shear and intensify!
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Re: ATL: GERT - Hurricane - Discussion

#1472 Postby Kazmit » Tue Aug 15, 2017 11:18 am

I'd make a guess that this is over 65kts by now just by looking at satellite imagery. It's certainly strengthening.
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Re: ATL: GERT - Hurricane - Discussion

#1473 Postby Sanibel » Tue Aug 15, 2017 1:14 pm

I would say climatology is favorable this year because it turned a struggling naked spiral into a hurricane...
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Re: ATL: GERT - Hurricane - Discussion

#1474 Postby Layten Holland » Tue Aug 15, 2017 1:48 pm

Will be interesting to see if Gert can push for Category 2 and become the strongest storm of the season so far. Also, I hope it can reach the UK like some of the modelling suggests, as we need the rain it would bring. Tropical remnants are always interesting to go through,especially wen theyre still post tropical and making the transition to extratropical. HWRF has been quite entertaining the last several days, showing a major hurricane, with the HMON also doing so earlier today as well. If there is going to be a major, Gert is probably one of the best scenario's, as it will head harmlessly out to seas and can be enjoyed whilst it lasts
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Re: ATL: GERT - Hurricane - Discussion

#1475 Postby cycloneye » Tue Aug 15, 2017 3:36 pm

Hurricane Gert Discussion Number 12
NWS National Hurricane Center Miami FL AL082017
500 PM EDT Tue Aug 15 2017

Gert has exhibited hints of an eye in visible satellite imagery
during the day, but that feature has not appeared in infrared
images. Still, the satellite presentation has improved since the
last advisory, and the initial intensity is set at 70 kt based on a
blend of final-T Dvorak numbers of T4.0 from TAFB and SAB and T4.7
from the UW-CIMSS ADT. Vertical shear is expected to be relatively
low--less than 20 kt--for the next 24 hours or so, which should
allow Gert to strengthen a little more over the warm waters south
of the northern wall of the Gulf Stream. The NHC forecast has been
increased slightly through 36 hours to account for the latest
intensity guidance, although it is still not as high as what is
shown by models such as HWRF and the HFIP Corrected Consensus.
Southwesterly shear increases substantially after 48 hours, which
should cause Gert to weaken, and the cyclone is also expected to
become extratropical by 72 hours. There is a lot of uncertainty on
the ultimate fate of the extratropical low, but most of the global
models keep Gert as a separate entity at least through day 4.

Gert's trajectory continues to veer as it rounds the western edge
of the subtropical ridge, and the initial motion is 020/10 kt.
Gert will soon become embedded in the mid-latitude westerlies,
sandwiched between a mid-oceanic high and a large cut-off low over
eastern Canada. This pattern will cause Gert to turn northeastward
and accelerate over the northwestern Atlantic during the next 48-72
hours. The cyclone will then likely slow down and turn more
northward by day 4 as it interacts with the aforementioned cut-off
low. There is very little cross-track spread among the track
models, but the latest suite of guidance has slowed down slightly
from previous runs. As a result, the new NHC forecast is just a
little slower than the previous one, near the various multi-model
consensus aids.

Swells from Gert should spread northward along the mid-Atlantic
coast of the United States during the next few days, with the first
impacts expected to occur tonight. These swells are likely to
produce dangerous surf and rip current conditions. Please consult
products from your local National Weather Service office.

FORECAST POSITIONS AND MAX WINDS

INIT 15/2100Z 33.7N 71.2W 70 KT 80 MPH
12H 16/0600Z 35.3N 69.4W 75 KT 85 MPH
24H 16/1800Z 37.4N 64.9W 80 KT 90 MPH
36H 17/0600Z 39.7N 58.4W 80 KT 90 MPH
48H 17/1800Z 42.9N 50.2W 70 KT 80 MPH
72H 18/1800Z 51.5N 37.1W 50 KT 60 MPH...POST-TROP/EXTRATROP
96H 19/1800Z 55.5N 33.0W 40 KT 45 MPH...POST-TROP/EXTRATROP
120H 20/1800Z...DISSIPATED

$$
Forecaster Berg
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Re: ATL: GERT - Hurricane - Discussion

#1476 Postby Kingarabian » Tue Aug 15, 2017 3:44 pm

Interesting wording by the NHC in that disco :uarrow:.

They say 20kts of shear is low yet 20kts of shear in the EPac has no problem tearing up a storm there.
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Re: ATL: GERT - Hurricane - Discussion

#1477 Postby Alyono » Tue Aug 15, 2017 3:49 pm

Kingarabian wrote:Interesting wording by the NHC in that disco :uarrow:.

They say 20kts of shear is low yet 20kts of shear in the EPac has no problem tearing up a storm there.


the shear is HIGHLY divergent this time
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Re: ATL: GERT - Hurricane - Discussion

#1478 Postby TheStormExpert » Tue Aug 15, 2017 3:54 pm

Gert is already the strongest storm pressure-wise.

 https://twitter.com/philklotzbach/status/897557038951268356


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Re: ATL: GERT - Hurricane - Discussion

#1479 Postby tolakram » Tue Aug 15, 2017 4:12 pm

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Re: ATL: GERT - Hurricane - Discussion

#1480 Postby txwatcher91 » Tue Aug 15, 2017 9:10 pm

Gert is looking quite healthy this evening, probably close to cat 2 strength and might make it to cat 3 if it can organize fast enough.

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