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Tracking hurricane Joaquin OTS


dailylurker

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BULLETIN

HURRICANE JOAQUIN ADVISORY NUMBER 15

NWS NATIONAL HURRICANE CENTER MIAMI FL AL112015

1100 AM EDT THU OCT 01 2015

...EYE OF JOAQUIN PASSING OVER SAMANA CAYS IN THE BAHAMAS...

...CENTRAL BAHAMAS TO EXPERIENCE HURRICANE FORCE WINDS...STORM

SURGE...AND HEAVY RAIN THROUGH TONIGHT...

SUMMARY OF 1100 AM EDT...1500 UTC...INFORMATION

-----------------------------------------------

LOCATION...23.0N 73.9W

ABOUT 80 MI...125 KM SSE OF SAN SALVADOR

MAXIMUM SUSTAINED WINDS...125 MPH...205 KM/H

PRESENT MOVEMENT...SW OR 220 DEGREES AT 6 MPH...9 KM/H

MINIMUM CENTRAL PRESSURE...942 MB...27.82 INCHES

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HURRICANE JOAQUIN DISCUSSION NUMBER 15

NWS NATIONAL HURRICANE CENTER MIAMI FL AL112015

1100 AM EDT THU OCT 01 2015

An Air Force Reserve Hurricane Hunter aircraft reported 700-mb

flight-level winds of 119 kt in the northwestern eyewall, with a

117 kt surface wind estimate from the Stepped Frequency Microwave

Radiometer in the southwestern eyewall. The latest central

pressure was 942 mb. Based on these data, the advisory intensity

is increased to 110 kt. Satellite imagery indicates that an eye is

trying to form in the central dense overcast, and that the cirrus

outflow is good in all directions.

Joaquin is expected to intensify a little more in the next 12 to 24

hours as it remains over very warm waters and in an environment of

decreasing vertical shear. After that time, there could be some

fluctuations in intensity due to eyewall replacement cycles. There

is some uncertainty in the intensity forecast in the 48-96 hour

period. The statistical models suggest that Joaquin should weaken

due to increasing shear. However, several of the global models

forecast the hurricane to move into an area of strong upper-level

divergence and show a falling central pressure. The new forecast

will continue to show weakening during this time, but it would not

be a surprise if it is stronger than currently forecast.

The initial motion is 220/5. Water vapor imagery shows a mid- to

upper-level ridge north of the hurricane, with a developing

deep-layer trough over the eastern and southeastern United States.

The dynamical models forecast this trough to become a cut-off low as

it moves southeastward and weakens the ridge. This pattern

evolution should cause Joaquin to turn northwestward in 24 hours or

so and then turn northward. After 36 hours, the guidance remains

very divergent. The Canadian, GFDL, HWRF, and NAVGEM models

forecast Joaquin to turn northwestward and make landfall over the

Carolinas and mid-Atlantic States. The ECMWF continues to forecast

a slower northeastward motion taking Joaquin near Bermuda and out to

sea. The UKMET and GFS are in between these extremes showing a

generally northward motion. Given the spread and the possibility

that the 1200 UTC guidance could show additional changes, the

forecast track after 36 hours is nudged only slightly to the east at

this time. The new track lies to the east of the landfalling models,

but to the west of the GFS, UKMET, ECMWF, and the various consensus

models. Further adjustments to the track may be needed later today

depending on how the models do (or do not) change.

KEY MESSAGES:

1. Preparations to protect life and property in the central Bahamas

should be complete. The slow motion of Joaquin over the next day or

so will bring a prolonged period of hurricane force winds, storm

surge, and very heavy rainfall to those islands.

2. Confidence in the details of the forecast after 72 hours is

still low, since there have been some large changes in the model

guidance overnight and a large spread in the model solutions

remains, with potential impacts from the Carolinas through New

England. It is also possible that Joaquin will remain far from the

U.S. east coast. A hurricane watch for the U.S. coast would likely

not occur until at least Friday morning.

3. Efforts to provide the forecast models with as much data as

possible continue, with twice daily NOAA G-IV jet missions in the

storm environment, and extra NWS balloon launches.

4. It's too early to talk about specific wind, rain, or surge

impacts from Joaquin in the United States. Regardless of Joaquin's

track, strong onshore winds will create minor to moderate coastal

flooding along the coasts of the mid-Atlantic and northeastern

states through the weekend.

5. Many portions of the eastern U.S. are currently experiencing

heavy rains and gusty winds associated with a frontal system. These

heavy rains are likely to continue for the next few days, even if

the center of Joaquin stays offshore. The resulting inland flood

potential could complicate preparations for Joaquin should it head

toward the coast, and even more substantial inland flooding is

possible if Joaquin later passes near or over these same areas.

FORECAST POSITIONS AND MAX WINDS

INIT 01/1500Z 23.0N 73.9W 110 KT 125 MPH

12H 02/0000Z 22.9N 74.2W 115 KT 130 MPH

24H 02/1200Z 23.7N 74.6W 120 KT 140 MPH

36H 03/0000Z 25.2N 74.4W 120 KT 140 MPH

48H 03/1200Z 27.5N 73.7W 110 KT 125 MPH

72H 04/1200Z 32.0N 73.0W 95 KT 110 MPH

96H 05/1200Z 36.0N 73.5W 75 KT 85 MPH

120H 06/1200Z 40.0N 72.5W 55 KT 65 MPH

$$

Forecaster Beven

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URRICANE JOAQUIN DISCUSSION NUMBER 15

NWS NATIONAL HURRICANE CENTER MIAMI FL AL112015

1100 AM EDT THU OCT 01 2015

An Air Force Reserve Hurricane Hunter aircraft reported 700-mb

flight-level winds of 119 kt in the northwestern eyewall, with a

117 kt surface wind estimate from the Stepped Frequency Microwave

Radiometer in the southwestern eyewall. The latest central

pressure was 942 mb. Based on these data, the advisory intensity

is increased to 110 kt. Satellite imagery indicates that an eye is

trying to form in the central dense overcast, and that the cirrus

outflow is good in all directions.

Joaquin is expected to intensify a little more in the next 12 to 24

hours as it remains over very warm waters and in an environment of

decreasing vertical shear. After that time, there could be some

fluctuations in intensity due to eyewall replacement cycles. There

is some uncertainty in the intensity forecast in the 48-96 hour

period. The statistical models suggest that Joaquin should weaken

due to increasing shear. However, several of the global models

forecast the hurricane to move into an area of strong upper-level

divergence and show a falling central pressure. The new forecast

will continue to show weakening during this time, but it would not

be a surprise if it is stronger than currently forecast.

The initial motion is 220/5. Water vapor imagery shows a mid- to

upper-level ridge north of the hurricane, with a developing

deep-layer trough over the eastern and southeastern United States.

The dynamical models forecast this trough to become a cut-off low as

it moves southeastward and weakens the ridge. This pattern

evolution should cause Joaquin to turn northwestward in 24 hours or

so and then turn northward. After 36 hours, the guidance remains

very divergent. The Canadian, GFDL, HWRF, and NAVGEM models

forecast Joaquin to turn northwestward and make landfall over the

Carolinas and mid-Atlantic States. The ECMWF continues to forecast

a slower northeastward motion taking Joaquin near Bermuda and out to

sea. The UKMET and GFS are in between these extremes showing a

generally northward motion. Given the spread and the possibility

that the 1200 UTC guidance could show additional changes, the

forecast track after 36 hours is nudged only slightly to the east at

this time. The new track lies to the east of the landfalling models,

but to the west of the GFS, UKMET, ECMWF, and the various consensus

models. Further adjustments to the track may be needed later today

depending on how the models do (or do not) change.

 
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I know its a terrible model in the LR, but I was just using it as if it was another possible solution

 

yoda, let's be honest.  If you know how bad it is why are you using it?  We both know why.  It is still showing a EC landfall.  We've seen all along that the point where models start to diverge is around hour 60+/- now.  NAM has so many issues that far out.  It just feeds the weenies

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I wonder how the eventual GFS replacement the FIM has been doing with this storm. I heard it mentioned a few days ago but not since. 

 

The FIM was one of the first to lock onto the landfalling west curve idea. Last night's run was still a dead on hit. Also, if I've interpreted it's configuration correctly it is currently using the GFS physics and data assimilation system which leaves the numerical solver (the fact that it uses hexagonal grid points as opposed to being spectral goes without saying) as the primary difference. I'm sure dtk could provide more information or correct me if I'm wrong.

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The FIM was one of the first to lock onto the landfalling west curve idea. Last night's run was still a dead on hit. Also, if I've interpreted it's configuration correctly it is currently using the GFS physics and data assimilation system which leaves the numerical solver (the fact that it uses hexagonal grid points as opposed to being spectral goes without saying) as the primary difference. I'm sure dtk could provide more information or correct me if I'm wrong.

 

Looks like the FIM is a LF between VA/NC border before turning NE and riding up the coast. Couple OTS members but most show LF. 

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Are there others that are as far along at ESRL right now? I know the FIM is one of the frequent ones I hear mentioned in model discussions. 

Yes:

http://www.nws.noaa.gov/ost/nggps/dycoretesting.html

 

Most likely candidate models at this point based on phase 1 testing are the GFDL FV3 and NCAR MPAS (i.e. not FIM, possibly but very unlikely to be "NIM, nonhydro..."

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NHC track bumped eastward ever so slightly. Incremental changes till a complete OTS forecast.

 

 

 

SMH -- nothing is set in stone. For goodness sakes. If you, or anyone, think this is OTS, then just stop posting about it, and go hang out in the obs thread about todays rain instead. 

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Looks like the FIM is a LF between VA/NC border before turning NE and riding up the coast. Couple OTS members but most show LF. 

 

Yep, the 0Z deterministic was a solid hit. I have no idea how it's doing this year, but in past years it has been said that it beats the GFS and sometimes even the ECMWF in track forecast skill. So I wouldn't completely dismiss the LF idea just yet.

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Yep, the 0Z deterministic was a solid hit. I have no idea how it's doing this year, but in past years it has been said that it beats the GFS and sometimes even the ECMWF in track forecast skill. So I wouldn't completely dismiss the LF idea just yet.

I've not seen any quantitative statistics showing the FIM > GFS/ECMWF (maybe some cherry picked cases or something, but not on the whole).

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Yes:

http://www.nws.noaa.gov/ost/nggps/dycoretesting.html

 

Most likely candidate models at this point based on phase 1 testing are the GFDL FV3 and NCAR MPAS (i.e. not FIM, possibly but very unlikely to be "NIM, nonhydro..."

Thank you! Always interested when you post.

Back on topic - 

Hurricane hunters now flew over to the NW quad it seems. Wonder what's up. Maybe entering the eye from a different angle? Seems atypical. 

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