Dr. Jeff Masters' WunderBlog

Tropical Storm Emily remains weak with roadblocks ahead
Posted by: Dr. Jeff Masters, 6:14 PM GMT on August 02, 2011 +20
Tropical Storm Emily took a moment to pause this morning, with no forward motion to speak of in the 11am EDT advisory from the National Hurricane Center, who say Emily might have been reorganizing. Emily eventually picked up some speed, and was moving west at 12 mph with maximum sustained winds of 45 mph in the 2pm EDT advisory. Satellite loops suggest that the storm has improved since yesterday, with strong thunderstorm activity surrounding the center of circulation accompanied by moderately strong outflow at higher levels. Recent satellite estimates of circulation show some consolidation at low levels (850mb), but weak circulation at higher levels (500mb). Despite the organized presentation on satellite, Hurricane Hunters found a generally disorganized storm this morning, with multiple potential centers. The lowest pressure that the Hunters found was 1007mb. Wind shear remains strong to the north of the storm, and this feature extends west across Puerto Rico and Hispaniola. Dry air, which has been lingering to the north of the system for the past few days, has begun to wrap around the northwest side of the storm. This, along with high wind shear along its potential track, could delay or prevent further intensification over the life of the storm. Another Hurricane Hunter mission is on its way to Emily now.


Figure 1. Visible satellite of Tropical Storm Emily at 1pm EDT.

Forecast for Tropical Storm Emily
The official forecast for Emily is a track toward the west-northwest over the next day and a half, after which it will make a turn to the northwest, and by Saturday, to the north. Although the National Hurricane Center has been shifting the forecast track to the east over the past few advisories, the U.S. coastline is still within the cone of uncertainty, and if we know something about this storm, it's that the forecast is uncertain. The CMC continues to be the western boundary of the model track forecasts, bringing Emily over Cuba and into the far eastern Gulf of Mexico. Today, on the eastern boundary of potential tracks fall the HWRF and the GFDL, which forecast Emily to cross over Hispaniola on a north-northwest trajectory, skirting the eastern edge of the Bahamas, and turning northeast before ever making connection with the U.S. coast. The Hurricane Center's official track follows the model consensus, and is the most likely track. Today, Emily is not forecast to strengthen into a hurricane within the next five days by the National Hurricane Center nor most of the models. Consensus seems to be that the storm will max out at a moderate to strong tropical cyclone, but this is assuming the storm can survive the wrath of Hispaniola.

Surviving Hispaniola

Hispaniola is somewhat notorious for being a major disruptor to tropical cyclones that dare cross over it. Since 1950, around two dozen tropical cyclones have crossed Hispaniola near where the National Hurricane Center is forecasting that Emily will pass over. A handful of these cyclones were of similar intensity with a track that was similar to Emily's forecast by various models, and although some went on to intensify (the warm Gulf of Mexico waters can be quite healing) many were fatally disrupted by the second largest island in the Caribbean.


Figure 2. Tropical cyclones that have crossed Hispaniola since 1950 (plotted using the NOAA Historical Hurricane Tracker).

Fay of 2008 developed in the Mona Passage on August 15th as a tropical storm. After a rough track westward over the length of Hispaniola, Fay emerged back into open water with little to no organized circulation, but managed to survive, and skirted the southern coast of Cuba for the next couple of days before turning north toward Florida. Many remember 2008's Fay as the storm that intensified and developed an eye-like feature over Florida after making landfall.

Cindy of 1993 was not as lucky in a battle with Hispaniola. Cindy developed as a tropical depression just east of the Lesser Antilles, and over the course of two days, tracked west-northwest through the Caribbean toward Hispaniola, strengthening into a tropical storm and reaching peak intensity just before landfall. Almost immediately upon landfall in the Dominican Republic, Tropical Storm Cindy deteriorated and the National Hurricane Center stopped issuing advisories on the system.

Emily of 1987 developed well east of the Lesser Antilles in late September and tracked northwest into the Caribbean, where it underwent a period of rapid intensification and was upgraded to a hurricane and then a major hurricane (category 3) just before landfall in the Dominican Republic. As the hurricane approached Hispaniola, it began deteriorating, and within 12 hours of landfall, Emily had weakened to a tropical storm and never regained its strength. Emily then took a turn to the northeast and tracked into the open Atlantic. Hurricane Katie of 1955 had a similar fate.

Angela
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1551. Tazmanian 12:16 AM GMT on August 03, 2011    
Quoting MiamiHurricanes09:
If there were an eyewall it would be evident on radar.



this one thing the rader from PR is too far a way yet too tell LOL
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1552. chevycanes 12:16 AM GMT on August 03, 2011    
Quoting TropicalAnalystwx13:


Is it?

look at the radar ike posted. no eye wall.
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1553. Patrap 12:16 AM GMT on August 03, 2011    
New convective Burst a rising on the fetch inflow side..

Emily learning the Dance.


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1554. bird72 12:16 AM GMT on August 03, 2011    
Quoting Levi32:


The mid-level circulation is inconsequential to the impacts that will be felt in PR. Rain bands with winds near or just below tropical storm force will likely be around for the next 24-36 hours. Emily may have yet to make her closest pass to PR, which should occur before she makes landfall in the Dominican Republic.


Thanks. One more question and thanks in advance, you see emily moving toward the west or moving to west north west?
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1556. Tazmanian 12:17 AM GMT on August 03, 2011    
Quoting Patrap:
New convective Burst a rising on the fetch inflow side..

Emily learning the Dance.





i dace with here
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1557. PcolaDan 12:17 AM GMT on August 03, 2011    
never mind
answered by Skye
this is what happens when you stop midway through a post
:|
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1558. Levi32 12:18 AM GMT on August 03, 2011    
Quoting bird72:


Thanks. One more question and thanks in advance, you see emily moving toward the west or moving to west north west?


Without recon to give us a decent center position it's hard to tell, but it looks closer to WNW than W.
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1559. GetReal 12:18 AM GMT on August 03, 2011    
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1560. weatherxtreme 12:18 AM GMT on August 03, 2011    
Guess it's a wait and see on what Emily will do once past Hispaniola, may not be much left but wait and see for sure. (biting nails now!)
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1561. OracleDeAtlantis 12:18 AM GMT on August 03, 2011    
Quoting bappit:

Nice pic. I see clear skies NW of the largest blob of convection. Looks like arc clouds from dry air oriented as if moving NW away from the center. The clearing seems to circle around the edges of that big blob of convection. Not all that healthy.
I don't know, it looks like the freakin' Witch of the East reborn to me. Look how she's kissed the surrounding air.



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1562. ncstorm 12:19 AM GMT on August 03, 2011    
Quoting P451:


Notice how the curve is must farther north? each advisory takes it up about 50 more miles..I dont think this is going to be a sharp turn
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1563. zoomiami 12:19 AM GMT on August 03, 2011    
Quoting aquak9:
iamajeepsmom- I'm with ya on the cat food. Them cute little varmints will kill ya in the middle of the night if ya don't feed'm proper.

don't forget the kitty litter, too.


One storm, I spent two hours trying to find a store that had kitty litter. Try to keep extras all the time during hurricane season, cause stinky kitty litter is the pits.
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1564. Tazmanian 12:19 AM GMT on August 03, 2011    
Quoting PcolaDan:
Is this other little guy anything?



could be some in down the rd
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1566. GTcooliebai 12:20 AM GMT on August 03, 2011    
Quoting weatherxtreme:
Guess it's a wait and see on what Emily will do once past Hispaniola, may not be much left but wait and see for sure. (biting nails now!)
Don't worry soon you will be pulling your hair out :P
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1567. iamajeepmom 12:20 AM GMT on August 03, 2011    
Quoting aquak9:
iamajeepsmom- I'm with ya on the cat food. Them cute little varmints will kill ya in the middle of the night if ya don't feed'm proper.

don't forget the kitty litter, too.


Ummm...one will wake me at 3am for food emergency, the other will bring a baby bird through the cat door and put it near food bowl. Cat litter is a given for the same one that wakes me every night .... thanks for the reminder (ps...if you have kitties, try the aldi brand, sandy like and very scoopable and CHEAP) ...
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1568. KoritheMan 12:20 AM GMT on August 03, 2011    
Quoting PcolaDan:
Is this other little guy anything?



That's actually just ITCZ convection. An actual tropical wave exists farther to the west, closer to 50W.
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1569. Levi32 12:21 AM GMT on August 03, 2011    
That looks like the center on Puerto Rico long-range radar. The location is close enough on satellite imagery, and the arcing of the echos would support the center being somewhere in that area.
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1570. bappit 12:21 AM GMT on August 03, 2011    
Quoting OracleDeAtlantis:
I don't know, it looks like the freakin' Witch of the East reborn to me. Look how she's kissed the surrounding air.




I think the visible pics were able to look through the thin veil of cirrus over the NW. Looks like the IR pics only register the cirrus.
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1571. weatherxtreme 12:22 AM GMT on August 03, 2011    
Quoting GTcooliebai:
Don't worry soon you will be pulling your hair out :P


LOL! for sure. Not panicking too much yet here in NE Florida just waiting to see more. keep it coming...
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1572. dolig 12:22 AM GMT on August 03, 2011    
Quoting DestinJeff:


I'm on probation as part of my parole from WunQuentin.

I can't violate that or it's back to the Slammer for me.


!!!!!!!lol!!!!!!!!
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1573. IKE 12:22 AM GMT on August 03, 2011    

Quoting P451:
Looks like the lower 48 may avoid another one.
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1574. BahaHurican 12:22 AM GMT on August 03, 2011    
Quoting Chicklit:


As of 8 p.m. tonight, Emily is not officially forecast to intensify above tropical storm status.
About the only good news re. Emily that eventuated today... lol

Quoting j2008:
Oops sorry, I forgot Tomas was a Cat 2 in the Antillies. Lets hope Emily doesnt pull a fast one, and goes into RI.
I didn't realize how much damage Tomas had wreaked elsewhere, even as a TD in the southern Caribbean... actually its impacts on Haiti were miraculously minor by comparison with other storms.

Quoting GetReal:






After closely observing the WV loop, and latest steering layer currents, I am of the opinion that Emily will continue to track to the left of the official NHC forecast. Even worse, it appears that the high pressure over the SE CONUS, and the Azore/Bermuda high are beginning to build a bridge between them, closing Emily's escape route NW towards the Bahamas. I'll be watching to see if that weakness over the Bahamas continues to close.
hmmm.... looking @ ur steering map, I was just thinking that's the best the opening's looked all day. Granted I pretty much missed the 2 - 6 p.m. period....

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1576. iamajeepmom 12:24 AM GMT on August 03, 2011    
Quoting zoomiami:


One storm, I spent two hours trying to find a store that had kitty litter. Try to keep extras all the time during hurricane season, cause stinky kitty litter is the pits.


Under normal circumstances its bad...can NOT imagine under THOSE conditions! It was in high demand huh? :(
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1579. BahaHurican 12:24 AM GMT on August 03, 2011    
Quoting bahamacast:
Great Exuma east of George Town.
Kewl.... welcome to the blog! I'd appreciate any input you have from Exuma... I have a few contacts in Long Island, Crooked Island and Mayaguana, but nobody on Exuma right now.

Stay safe!
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1581. atmoaggie 12:25 AM GMT on August 03, 2011    
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1582. doubtit 12:25 AM GMT on August 03, 2011    
Quoting OracleDeAtlantis:
I don't know, it looks like the freakin' Witch of the East reborn to me. Look how she's kissed the surrounding air.





The storm is not healthy, the outflow to the north and east is almost non-existent. The main are of convedtion is shrinking and there are arc clouds showing that Emily is sucking in dry air.
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1584. OracleDeAtlantis 12:25 AM GMT on August 03, 2011    
Quoting bappit:

I think the visible pics were able to look through the thin veil of cirrus over the NW. Looks like the IR pics only register the cirrus.
I see that, but the precip. shows she's walled herself off, at least for now. She's not gulping in dry air at the moment, because I can see clearly when this occurred with Don, when viewing this animation. It was obvious.



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1585. bird72 12:25 AM GMT on August 03, 2011    
Quoting Levi32:


Without recon to give us a decent center position it's hard to tell, but it looks closer to WNW than W.


Thanks for the info. Many people here in PR are waiting for emily effects to take on the island. There still also many people who are seeing the delay of Emily effects as if the storm effects are not going to have any effects on us.
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1586. weatherxtreme 12:25 AM GMT on August 03, 2011    
Glad to see at least that Jason character with the mega screen names by the hour isn't littering up the blog tonight so we can stick to the weather at hand LOL!
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1587. stormpetrol 12:25 AM GMT on August 03, 2011    
I feel sorry for the poor Haitians, looks like no matter now what track Emily takes they could get life threatening floods, ain't they seen enough! SAD!!!
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1588. EYEStoSEA 12:26 AM GMT on August 03, 2011    
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1590. Hurricanes12 12:26 AM GMT on August 03, 2011    
Levi, if Emily continues moving west, would this promote a more eastern or western route down the road in regards to Florida & the Bahamas?
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1591. DontAnnoyMe 12:27 AM GMT on August 03, 2011    
Quoting weatherxtreme:
Glad to see at least that Jason character with the mega screen names by the hour isn't littering up the blog tonight so we can stick to the weather at hand LOL!


It's starting. See 1577.
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1592. HurricaneHunterJoe 12:27 AM GMT on August 03, 2011    
Quoting NICycloneChaser:
I really don't think recon are going until a 06Z run. Not sensible.


you better get em on the phone and let em know
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1593. charlottefl 12:28 AM GMT on August 03, 2011    
Quoting iamajeepmom:


Under normal circumstances its bad...can NOT imagine under THOSE conditions! It was in high demand huh? :(


Can remember when they had Ivan projected to hit the W. Coast of FL, had just been through Charley in Port Charlotte, and people started spreading rumors about gas, so all the stations ran out. I ran out of gas after lookin at almost every station in town. This was after Frances and just before Jeanne. Was a little frustrated at the time needless to say.
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1594. jasoniscoolman99 12:28 AM GMT on August 03, 2011    
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1595. thedawnawakening3 12:29 AM GMT on August 03, 2011    
Lack of outflow on the western semicircle is really impeding development of Emily. Latest convective burst is quite impressive, but all she will be able to do with this is go through pulse modes if she can't get outflow on the western side going and if she can't get good outflow channels going.
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1596. ProgressivePulse 12:29 AM GMT on August 03, 2011    
000
FXUS62 KMFL 022301
AFDMFL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MIAMI FL
701 PM EDT TUE AUG 2 2011

.PREV DISCUSSION... /ISSUED 528 PM EDT TUE AUG 2 2011/

UPDATE...
THE LATEST FORECAST FROM THE NATIONAL HURRICANE CENTER HAS MOVED
THE LATEST FORECAST TRACK OF EMILY TO THE EAST. THIS HAS CONFINED THE
TROPICAL STORM FORCE WINDS EAST OF THE CWA ATLANTIC WATERS FOR
LATE FRIDAY NIGHT INTO SATURDAY MORNING. HOWEVER...THE EASTERN
PORTION OF SOUTH FLORIDA INCLUDING THE ATLANTIC AND BISCAYNE BAY
WATERS ARE STILL WITHIN THE CONE OF UNCERTAINTY. PEOPLE STILL
NEED TO MONITOR THE LATEST FORECAST FROM THE NATIONAL HURRICANE
CENTER ON TROPICAL STORM EMILY.
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1597. bappit 12:29 AM GMT on August 03, 2011    
Hmmmmmm ... Wicked Witch said "I'm eroding, eroding. Oh what world, what a world." Or something like that.

The more Emily strengthens, the more it tends to pull in dry air. It is caught in a negative feedback loop. Reminds me of how Don rained its butt off just offshore from Brownsville then evaporated. Heck knows there's lots of dry air over Texas. Maybe not as much dry air over by Emily, but it is there.

I thought I saw a post that said the next recon was canceled and we have to wait. So we just have to watch the pictures.
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1599. beell 12:30 AM GMT on August 03, 2011    
I'm a little hesitant about calling this a two-trough scenario. Lowered heights in the modeled zonal flow are more than likely associated with Emily and not a shortwave. A slightly more southward track in the zonal flow perhaps. A slow ride out into the westerlies.
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1600. weatherxtreme 12:30 AM GMT on August 03, 2011    
Quoting DontAnnoyMe:


It's starting. See 1577.


Ahh, you are right, my bad LOL! he is still making screen name after name WOW
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About JeffMasters
Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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