ATL: ISAAC - Post-Tropical - Discussion

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Re: ATL: INVEST 94L

#341 Postby alan1961 » Sun Aug 19, 2012 5:02 am

Probably enough dry air around to keep this in check for a while yet,
can see invest 94L being another one that struggles this season but you never know in the tropics :wink:

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#342 Postby HurricaneWarning92 » Sun Aug 19, 2012 5:28 am

Im confused lol. Isnt this what most people here wanted? Idk but seems like some of you contradict yourselves. When the models were showing a potentially major hurricane approaching the islands, most, if not everyone was hoping it stays weak or deviates or such... Well? It looks like its taking its time to develop so it is looking less likely that it'll be that strong when it reaches the islands. Now though, some are somewhat disappointed? Pick a side lol. Isnt this better for the islands?
Anyway, i think it will eventually get its act together, just not for at least the next 24 hours. I could be wrong though.
This is just an opinion and shouldnt be taken seriously as it is not official.
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rainstorm

#343 Postby rainstorm » Sun Aug 19, 2012 5:33 am

aug/sept are the 2 months i look forward to. looks like 94L has bit the dust. forget anything behind it. maybe once it gets to nowhere it will do something. all hype, no substance.
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#344 Postby Shuriken » Sun Aug 19, 2012 5:37 am

A new whirl has developed north of the ITCZ ahead of Invest 94, and will almost certainly gum up the models.
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#345 Postby rainstorm » Sun Aug 19, 2012 5:40 am

the conditions are supposed to be favorable so i would expect development.
Last edited by rainstorm on Sun Aug 19, 2012 6:22 am, edited 1 time in total.
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Re: ATL: INVEST 94L

#346 Postby Hurricane Alexis » Sun Aug 19, 2012 5:49 am

If this doesn't develop, this season is over for me....or almost over, maybe we get lucky in september.
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#347 Postby Gustywind » Sun Aug 19, 2012 6:07 am

Stu Ostro, Senior Meteorologist, The Weather Channel

Aug 19, 2012 4:22 am ET

:rarrow: http://www.weather.com/newscenter/hurri ... lGraphical tropical update:Tropics Watch

ATLANTIC

- For the Isaac wannabe currently in the eastern Atlantic, various runs of various forecast models have shown in the long range everything from a hurricane raking the entire coast from Florida to New England, to a storm moving harmlessly out to sea in the Atlantic, to barely more than a tropical wave in the Gulf of Mexico. One must be careful to not overreact to each run of every model. Let's see what the trends are like over the next day or two -- plenty of time yet to prepare if it ends up being a significant threat to the Caribbean or other land areas downstream from there.

In the meantime, the system continues moving very quickly toward the west, and although it's spinning on satellite loops, there has not yet been a lot of persistent deep convection (thunderstorms); analyses show the atmosphere over the tropical Atlantic is more stable than average for this time of year. Thus in addition to the track questions, there is also intensity uncertainty.

Stay tuned ...
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Re:

#348 Postby rainstorm » Sun Aug 19, 2012 6:14 am

Gustywind wrote:Stu Ostro, Senior Meteorologist, The Weather Channel

Aug 19, 2012 4:22 am ET

:rarrow: http://www.weather.com/newscenter/hurri ... lGraphical tropical update:Tropics Watch

ATLANTIC

- For the Isaac wannabe currently in the eastern Atlantic, various runs of various forecast models have shown in the long range everything from a hurricane raking the entire coast from Florida to New England, to a storm moving harmlessly out to sea in the Atlantic, to barely more than a tropical wave in the Gulf of Mexico. One must be careful to not overreact to each run of every model. Let's see what the trends are like over the next day or two -- plenty of time yet to prepare if it ends up being a significant threat to the Caribbean or other land areas downstream from there.

In the meantime, the system continues moving very quickly toward the west, and although it's spinning on satellite loops, there has not yet been a lot of persistent deep convection (thunderstorms); analyses show the atmosphere over the tropical Atlantic is more stable than average for this time of year. Thus in addition to the track questions, there is also intensity uncertainty.

Stay tuned ...


more stable? stu has really backed off since yesterday. its racing way too fast. i thought people were saying the MJO was favorable which would make things more unstable?
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#349 Postby Gustywind » Sun Aug 19, 2012 6:17 am

2AM TWD

000
AXNT20 KNHC 190600
TWDAT

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
205 AM EDT SUN AUG 19 2012

TROPICAL WEATHER DISCUSSION FOR NORTH AMERICA...CENTRAL
AMERICA...GULF OF MEXICO...CARIBBEAN SEA...NORTHERN SECTIONS OF
SOUTH AMERICA...AND ATLANTIC OCEAN TO THE AFRICAN COAST FROM THE
EQUATOR TO 32N. THE FOLLOWING INFORMATION IS BASED ON SATELLITE
IMAGERY...WEATHER OBSERVATIONS...RADAR...AND METEOROLOGICAL
ANALYSIS.

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
0545 UTC.

...SPECIAL FEATURES...

AN ACTIVE TROPICAL WAVE IS LOCATED IN THE ERN/CENTRAL TROPICAL
ATLC ALONG 32W...WITH AN ASSOCIATED 1008 MB LOW NEAR 14N32W
EMBEDDED WITHIN THE MONSOONAL GYRE. THIS SYSTEM IS MOVING
WESTWARD AROUND 20 KT. SCATTERED SHOWERS AND THUNDERSTORMS ARE
FROM 10N-18N BETWEEN 30W-37W...WITHIN THE BROAD CONVECTIVE
REGION ASSOCIATED TO THE MONSOON TROUGH. ENVIRONMENTAL
CONDITIONS APPEAR CONDUCIVE FOR A TROPICAL DEPRESSION TO FORM
DURING THE NEXT DAY OR TWO...AND THIS SYSTEM HAS A HIGH CHANCE
OF BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS AS IT
MOVES WESTWARD AT ABOUT 17 KT. GLOBAL MODELS HAS A WWD
TRAJECTORY TOWARDS THE CARIBBEAN. INTERESTS ACROSS THE E AND NE
CARIBBEAN SHOULD MONITOR THE PROGRESS OF THIS SYSTEM.
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#350 Postby Shuriken » Sun Aug 19, 2012 6:22 am

Modelss, schmodels....

I give 1-in-3 odds that the system at 12N/47W (see last post of mine above) develops while Invest-94 pukes.

http://www.ssd.noaa.gov/goes/east/tatl/flash-ir2.html

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#351 Postby Gustywind » Sun Aug 19, 2012 6:26 am

Tropical Atlantic Booming; New Depression Coming?

By Brian Edwards, Meteorologist

Aug 19, 2012; 6:16 AM ET
:rarrow: http://www.accuweather.com/en/weather-n ... -new/70306

The tropical Atlantic Basin remains very active with a powerful hurricane and potentially a new depression on the way.

Helene just made landfall near Tampico, Mexico, while Gordon will bring hurricane-force winds and heavy rain to the Azores.

As we continue to trek toward the all important peak of hurricane season which occurs on Sept. 10, the basin appears to be showing signs of remaining active at least for the next week or two.

A new tropical wave which came off Africa on Thursday continues to track through the western Atlantic to the southwest of the Cape Verde Islands. This wave is producing quite a bit of shower and thunderstorm activity as it tracks westward.

The wave is tracking on the southern edge of dry, dusty African air which means that as long as it doesn't take a northerly turn into more hostile conditions, it should have ample opportunity to develop.

Along with warm sea surface temperatures, the winds aloft are relatively light, which is another sign that this wave could organize over the next day or two.

AccuWeather.com meteorologists agree that this wave has a good shot to become the next tropical depression or tropical storm. If it were to develop into a storm, its name would be Isaac.

The next question becomes, where would this feature go should it develop?

Most of the forecast models at this point take this feature westward to about the Lesser Antilles before taking it on a more northerly track. Whether or not it then continues toward the U.S. or takes a turn toward Bermuda or the open waters of the Atlantic remains to be seen.

The bottom line is that the tropics are active and our meteorologists expect them to remain quite active at least through the end of the month.

Vacationers heading to U.S. beaches or out of the country to the Caribbean or Bermuda should keep an eye on the latest tropical weather forecasts over the next few weeks as we move into prime time for tropical cyclone development
.
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Shuriken

#352 Postby Shuriken » Sun Aug 19, 2012 6:27 am

Doubled-barreled whirls; Invest-94 is the trailing one: http://www.ssd.noaa.gov/goes/east/catl/flash-vis.html

My guess is that Invest-94 will drop from 60% to 40% in the next update, and the new whirl will be made at least 20%.
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Re: ATL: INVEST 94L

#353 Postby cycloneye » Sun Aug 19, 2012 6:34 am

This mornings discussion from the San Juan NWS.

MOST OF THE LONG RANGE MODELS DEVELOP A TROPICAL CYCLONE IN THE
WAVE THAT WAS NEAR 35 WEST AT 19/09Z. BUT...BECAUSE THE CYCLONE HAS
NOT YET DEVELOPED THE WAVE IS ADVANCING UNIMPEDED ACROSS THE
ATLANTIC AND THE MODELS ARE SHOWING THE CYCLONE MOVING THROUGH THE
LOCAL AREA EARLIER AND EARLIER. AT PRESENT THE GFS SHOWS IT MOVING
SOUTH OF THE FORECAST AREA WEDNESDAY NIGHT. THE GFS DEVELOPS IT
RATHER SLOWLY...SO WOULD EXPECT THAT IT WILL ARRIVE THEN OR
SLIGHTLY EARLIER. CONSIDERABLE UNCERTAINTY REMAINS REGARDING THE
TRACK AND INTENSITY OF THIS SYSTEM AND AFRICAN DUST STREAMING TO
THE NORTH OF THE WAVE IS LIKELY SLOWING THE DEVELOPMENT JUST AS IT
HAS THE LAST SEVERAL SYSTEMS THAT HAVE ENDEAVORED TO STRENGTHEN.
ALSO THE WAVE IN QUESTION APPEARS TO BE GROWING AT THE EXPENSE OF
THE WAVE AHEAD OF IT WHICH IT IS OVERTAKING. THEREFORE HAVE
INCREASED THE WINDS IN THE GRIDS AND THE POPS OVER A MORE GENERAL
AREA BEGINNING TUESDAY WITH THE EXPECTED PASSAGE OF THE FIRST WAVE
AND THEN WEDNESDAY AND THURSDAY USING THE CURRENT TIMING TO
INFLUENCE THE DIRECTION WITHOUT EXPLICITLY DEFINING THE CENTER OR
TRACK...WITH THE GENERAL IDEA THAT THE SYSTEM WILL PASS SOUTH OF
THE AREA. THIS SYSTEM STILL HAS THE POTENTIAL TO VEER NORTH AND TO
SPREAD DANGEROUS WINDS AND VERY HEAVY RAINS ACROSS THE AREA BEFORE
FRIDAY...THEREFORE EVERYONE SHOULD REMAIN VIGILANT WITH REGARDS TO
THE PROGRESS AND DEVELOPMENT OF THIS SYSTEM. THE GFS ALSO DEVELOPS
ANOTHER WAVE BEHIND THIS SYSTEM AND IT SHOULD PASS THROUGH
SATURDAY NIGHT OR SUNDAY.
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#354 Postby Extratropical94 » Sun Aug 19, 2012 6:46 am

Stays at 60% for now:

SHOWERS AND THUNDERSTORMS ASSOCIATED WITH A TROPICAL WAVE LOCATED
ABOUT 800 MILES WEST OF THE CAPE VERDE ISLANDS HAVE CHANGED LITTLE
IN ORGANIZATION OVER THE PAST FEW HOURS. ENVIRONMENTAL CONDITIONS
APPEAR CONDUCIVE FOR A TROPICAL DEPRESSION TO FORM DURING THE NEXT
DAY OR TWO...AND THIS SYSTEM HAS A HIGH CHANCE...60 PERCENT...OF
BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS AS IT MOVES
WESTWARD AT 20 TO 25 MPH.
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#355 Postby Gustywind » Sun Aug 19, 2012 7:30 am

Stays at 1.0/1.0

19/1145 UTC 14.8N 36.5W T1.0/1.0 94L
19/0545 UTC 14.1N 34.6W T1.0/1.0 94L
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#356 Postby CalmBeforeStorm » Sun Aug 19, 2012 7:32 am

I see an ideal setup for a hurricane threat for the Caribbean Islands and possibly the CONUS. We have a strong wave with a nice turn to it at a good latitude coming into the heart of hurricane season with no major negative factors forecast ahead of it. The system has not developed quickly which means it won't be infuenced by any weakness to it's north for now (as per the CMC and NOGAPS). That none of the reliable models show development is interesting but not all that unusual. I think we will see a tropical storm by 50 longitude and a hurricane by 60 longitude.

Just my opinion and in no way an official forecast. Afterall, what do I really know?

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#357 Postby Gustywind » Sun Aug 19, 2012 7:40 am

805 AM TWD



000
AXNT20 KNHC 191156
TWDAT

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
805 AM EDT SUN AUG 19 2012

TROPICAL WEATHER DISCUSSION FOR NORTH AMERICA...CENTRAL
AMERICA...GULF OF MEXICO...CARIBBEAN SEA...NORTHERN SECTIONS OF
SOUTH AMERICA...AND ATLANTIC OCEAN TO THE AFRICAN COAST FROM THE
EQUATOR TO 32N. THE FOLLOWING INFORMATION IS BASED ON SATELLITE
IMAGERY...WEATHER OBSERVATIONS...RADAR...AND METEOROLOGICAL
ANALYSIS.

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
1115 UTC.

...SPECIAL FEATURES...

AN ACTIVE TROPICAL WAVE IS LOCATED IN THE ERN/CENTRAL TROPICAL
ATLC ALONG 34W...WITH AN ASSOCIATED 1009 MB LOW NEAR 14N35W
EMBEDDED WITHIN THE MONSOONAL GYRE. THIS SYSTEM IS MOVING
WESTWARD AROUND 20 KT. SCATTERED SHOWERS AND THUNDERSTORMS ARE
FROM 10N-18N BETWEEN 31W-38W...WITHIN THE BROAD CONVECTIVE
REGION ASSOCIATED TO THE MONSOON TROUGH. ENVIRONMENTAL CONDITIONS
APPEAR CONDUCIVE FOR A TROPICAL DEPRESSION TO FORM DURING THE
NEXT DAY OR TWO...AND THIS SYSTEM HAS A HIGH CHANCE OF BECOMING
A TROPICAL CYCLONE DURING THE NEXT 48 HOURS AS IT MOVES WESTWARD
AT 20 KT.
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Re: ATL: INVEST 94L

#358 Postby cycloneye » Sun Aug 19, 2012 7:46 am

12z Best Track

Continues at a fast pace moving west at 16kts.

AL, 94, 2012081912, , BEST, 0, 144N, 362W, 25, 1011, DB

ftp://ftp.nhc.noaa.gov/atcf/tcweb/inves ... 012.invest

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Re: ATL: INVEST 94L

#359 Postby tolakram » Sun Aug 19, 2012 8:07 am

Latest HiRes shot. Not much to see.

Image

A broader view (large image): http://img198.imageshack.us/img198/7023/zztemp2.jpg

Both of these from: ftp://goes.gsfc.nasa.gov/pub/goeseast/f ... llres/vis/
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Re: ATL: INVEST 94L

#360 Postby Blown Away » Sun Aug 19, 2012 8:08 am

If the models shift a little north or south of the big islands I think we will see 94L as a hurricane. 06z GFS wanted to strengthen 94L but it went near PR, Hispaniola, and Cuba and the result of that is remnants. IMO, 94L is starting to pull together this morning.
http://www.ssd.noaa.gov/goes/east/tatl/loop-avn.html
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