Dr. Jeff Masters' WunderBlog

Adieu to Danny
Posted by: Dr. Jeff Masters, 09:50 GMT le 29 août 2009 +0
Hi, Dr. Rob Carver filling in for Dr. Masters. With the 5AM EST update, NHC has discontinued issuing the tropical storm watches and will no longer issue any updates about the storm. Danny has gone extratropical and has merged with a frontal low off the Carolina coast. The most recent aircraft reconnaissance flight was unable to find a cyclonic circulation or tropical storm force winds in the remnants of Danny.

That isn't to say that Danny's remnants don't pose an element of risk for the East Coast. High surf from large swells is expected along the East Coast. New England can expect to see a lot of rain as Denny's remnants fly by.

Invest 94L

Invest 94L is still out near South America, but it's convective activity seems to be cycling down right now. The global models (GFS and GEM) do pull 94L (to be precise, a feature that could be 94L) north of the Lesser Antilles. Given how the GFDL has performed with other Invests this season, I can wait a day or so before they run the GFDL for this storm.

East Pacific and elsewhere

For those of you wanting to look at tropical storms, Jimena has just formed in the Eastern Pacific basin. The track uncertainty is fairly large, so I'll be keeping an eye on this storm to see if it will impact Mexico or the American Southwest. In the Western Pacific, Tropical Storm Krovahn looks like it will be grazing the Japanese coastline just east of Tokyo Bay.

I'll give Invest94L a chance to see the Sun and then I'll update this entry.

Update:1545 EDT

G'afternoon everybody, Invest94L has perked up a little since this's morning blog entry. In my judgment, the extent and peak magnitude of convection has increased, and scatterometer data shows that Invest94L has a weak cyclonic circulation. Here's the 9Z ascending pass:

Quickscat Pass over Invest94L
Figure 1Ascending Quikscat pass centered over Invest94L at 9Z Aug 29 2009.

There will be a big update tonight after the 00Z model cycle data comes in.
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851. plywoodstatenative 20:56 GMT le 29 août 2009    
What is that feature above 94L, is that a ULL?

As for 94L, I am waiting to see if it can get its act together before even considering where it will go. Thats the million dollar question, such it was with the other systems. Can it fight off the dry air and shear around it, moisten the environment and still maintain itself. That will be the item to watch, also think about this: As with Ana, she set the enviroment up for Bill, any chance this system will set the environment up for the one rolling off the coast of Africa with a broader circulation to it?
Member Since: 15 novembre 2005 Posts: 16 Comments: 4147
852. stormwatcherCI 20:57 GMT le 29 août 2009    
Quoting StormFreakyisher:

I doubt it will go in the Carib. I mean look every storm that formed went over the Antilles or over the islands and not in the Caribbean.
Felix 2007 developed into a depression on Aug 31 just 195 miles east of Barbados and traveled across the entire Caribbean basin where it dissapated over Nicaragua. Dean also crossed the entire basin the same year. When they form far south they tend to cross the Caribbean basin.
Member Since: 9 octobre 2008 Posts: 0 Comments: 8038
853. TriniGirl26 20:57 GMT le 29 août 2009    
(fingers crossed) come on erika! pass the caribbean, shoot for the north! be the best fish storm u can be !!!....Sorry guys i couldn't help it...lol
Member Since: 18 août 2009 Posts: 0 Comments: 201
854. StadiumEffect 20:57 GMT le 29 août 2009    
I'm still skeptical about this disturbance moving north of the Antilles. It appears that the system has commenced a west-northwestward movement, but a more northerly component will be necessary for it to pass north of the islands. The system is moving at a decent forward speed and remains relatively weak. If it does not organize quicker, I would expect the models to shift south. I'm more inclined to say that it will enter the north-eastern Caribbean (possibly over the islands), but not much further north than that once reaching about 62.5. The re-building of the high is going to be an important factor which will determine areas to be threatened in a couple days (assuming development occurs).
855. plywoodstatenative 20:57 GMT le 29 août 2009    
The GFS however was forecasting something to form in the Eastern Pacific and do a crossover into the BOC, any chance of seeing that happen?
Member Since: 15 novembre 2005 Posts: 16 Comments: 4147
857. StadiumEffect 21:01 GMT le 29 août 2009    
Quoting stormwatcherCI:
Felix 2007 developed into a depression on Aug 31 just 195 miles east of Barbados and traveled across the entire Caribbean basin where it dissapated over Nicaragua. Dean also crossed the entire basin the same year. When they form far south they tend to cross the Caribbean basin.


Ageed. Systems that far south while approacing the Antilles more often than not, tend to traverse the Caribbean. Weaknesses in the high have to be significant to induce enough northward movement to pull them north of the islands.
858. Barbados 21:02 GMT le 29 août 2009    
Does anyone have any record of where the models were forecasting Ivan to go in comparison to its actual path?
Member Since: 9 août 2006 Posts: 0 Comments: 253
859. noleweatherman 21:02 GMT le 29 août 2009    
Quoting caneluver:
The high is building to its north also, just like the CMC model predicts. Not a good thing for the East Coast of the U.S. if or when this wave devlopes. Sooner or later one and it only takes one,is going to squeek by.
like i said dude i dont think this one is gonna miss us this time i dont like the end of the cmc. reminds me of frances
860. MisterJohnny 21:03 GMT le 29 août 2009    
Is anyone having problems viewing the SFWMD Model plots web page?
861. HadesGodWyvern 21:03 GMT le 29 août 2009    
849. StormFreakyisher 8:54 PM GMT on August 29, 2009

LOL your avator reminds me of Giygas from Mother 2
Member Since: 24 mai 2006 Posts: 43 Comments: 36686
863. extreme236 21:04 GMT le 29 août 2009    
Quoting caneluver:
The high is building to its north also, just like the CMC model predicts. Not a good thing for the East Coast of the U.S. if or when this wave devlopes. Sooner or later one and it only takes one,is going to squeek by.


The High wont stay that way long with persistent troughing.
Member Since: 2 août 2007 Posts: 19 Comments: 19234
864. stormwatcherCI 21:05 GMT le 29 août 2009    
Quoting Barbados:
Does anyone have any record of where the models were forecasting Ivan to go in comparison to its actual path?
I don't have any records but they predicted at one point for it to pass N of the Cayman Islands when it in fact passed barely south of there.
Member Since: 9 octobre 2008 Posts: 0 Comments: 8038
866. BDAwx 21:06 GMT le 29 août 2009    
Jimena has the smallest eye that I've ever seen! or have i how does it compare to say Wilma's eye?
It also looks like its trying to go through rapid intensification as well
Member Since: 3 août 2009 Posts: 51 Comments: 509
869. centex 21:07 GMT le 29 août 2009    
Quoting extreme236:


The High wont stay that way long with persistent troughing.
It's going into carribean IMO, the long shot is weak system getting picked up.
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870. Barbados 21:07 GMT le 29 août 2009    
Quoting stormwatcherCI:
I don't have any records but they predicted at one point for it to pass N of the Cayman Islands when it in fact passed barely south of there.


Thanks stormwatcherCI, I was really meaning the models when it was still in the early stages in the mid atlantic. Were they forecasting a C'bean storm or a north of the islands?
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871. MisterJohnny 21:07 GMT le 29 août 2009    
Thank You iceman55
874. extreme236 21:08 GMT le 29 août 2009    
Quoting centex:
It's going into carribean IMO, the long shot is weak system getting picked up.


Its already moving WNW is gradually organizing...SHIPS doesnt keep it weak for long.
Member Since: 2 août 2007 Posts: 19 Comments: 19234
875. crowe1 21:09 GMT le 29 août 2009    
Quoting tornadodude:


how close is that to lake george?




Sorry it took so long to respond, folding laundry.
About 40 min driving, about 30 miles "as the crowe flies".
Member Since: 26 janvier 2007 Posts: 15 Comments: 914
876. Dakster 21:09 GMT le 29 août 2009    
Quoting MisterJohnny:
Is anyone having problems viewing the SFWMD Model plots web page?


This may have been answered already, but SFWMD is down until Sunday night... There was a notice on the site yesterday.
Member Since: 10 Mars 2006 Posts: 0 Comments: 4932
878. StormFreakyisher 21:10 GMT le 29 août 2009    
Quoting stormwatcherCI:
Felix 2007 developed into a depression on Aug 31 just 195 miles east of Barbados and traveled across the entire Caribbean basin where it dissapated over Nicaragua. Dean also crossed the entire basin the same year. When they form far south they tend to cross the Caribbean basin.

I am talking about this hurricane season 2009.
Member Since: 16 mai 2009 Posts: 0 Comments: 684
879. StadiumEffect 21:10 GMT le 29 août 2009    
Quoting stormwatcherCI:
I don't have any records but they predicted at one point for it to pass N of the Cayman Islands when it in fact passed barely south of there.


That should have been expected though. We put so much emphasis on the exact track and often fail to realize that a slight wobble or change in direction can create a nightmare. The official NHC track was about 100 miles off and that created a practical landfall for us.
880. stormwatcherCI 21:13 GMT le 29 août 2009    
Quoting Barbados:


Thanks stormwatcherCI, I was really meaning the models when it was still in the early stages in the mid atlantic. Were they forecasting a C'bean storm or a north of the islands?
Quoting Barbados:


Thanks stormwatcherCI, I was really meaning the models when it was still in the early stages in the mid atlantic. Were they forecasting a C'bean storm or a north of the islands?
Official track forecasts had, in general, a persistent right-of-track bias for the first 11 days of Ivan's existence as a tropical cyclone (Figure 5a). The official track forecasts relied heavily on the global model forecasts, which prematurely eroded the large and strong subtropical ridge to the north of Ivan that extended well westward across the Bahamas, Florida, and into the Gulf of Mexico. In fact, several of the GFS model forecast cycles consistently eroded the ridge across Bahamas and took Ivan well to the east of Florida, even as the hurricane was approaching Jamaica. Hope this helps.
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881. Relix 21:11 GMT le 29 août 2009    


Something doesn't make much sense in the steering layers =P. It'll probably move west back again soon, I doubt a WSW movement would take place though.
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884. stormwatcherCI 21:12 GMT le 29 août 2009    
Quoting StadiumEffect:


That should have been expected though. We put so much emphasis on the exact track and often fail to realize that a slight wobble or change in direction can create a nightmare. The official NHC track was about 100 miles off and that created a practical landfall for us.
You in Cayman ?
Member Since: 9 octobre 2008 Posts: 0 Comments: 8038
886. HadesGodWyvern 21:15 GMT le 29 août 2009    
Hurricane Watch likely for Baja California Peninsula in the future it looks like.
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887. stormpetrol 21:15 GMT le 29 août 2009    
Quoting TriniGirl26:
(fingers crossed) come on erika! pass the caribbean, shoot for the north! be the best fish storm u can be !!!....Sorry guys i couldn't help it...lol

I understand where ya coming from, it would be good for it to head due North now, but really imo opinion the models are way off on this, been from the start, of course things can change , but I doubt it.
Member Since: 29 avril 2007 Posts: 0 Comments: 6396
889. Drakoen 21:17 GMT le 29 août 2009    
Relix, the trough advecting off the eastern seaboard will push the high backwards and induce more northerly movement of 94L
Member Since: 28 octobre 2006 Posts: 57 Comments: 29010
890. BenBIogger 21:19 GMT le 29 août 2009    
Quoting Drakoen:
Relix, the trough advecting off the eastern seaboard will push the high backwards and induce more northerly movement of 94L


Hey Drak!
8 to 10 DAY 500MB MEAN


Member Since: 19 Mars 2009 Posts: 0 Comments: 1419
891. stormpetrol 21:20 GMT le 29 août 2009    
Quoting Barbados:
Does anyone have any record of where the models were forecasting Ivan to go in comparison to its actual path?

Ivan was forcasted originally when it developed to move more northernly into Bahamas and probably hit the east coast , maybe you can check the archive and find out.
Member Since: 29 avril 2007 Posts: 0 Comments: 6396
892. StadiumEffect 21:20 GMT le 29 août 2009    
Quoting stormwatcherCI:
You in Cayman ?


Not at the moment. I'm in Miami to finish school.
893. extreme236 21:20 GMT le 29 août 2009    
Quoting DM21Altestic:
not to mention, Felix was a 94L at the SAME TIME OF YEAR.

also, the East Coast is northcasting, 'cause it's going Florida points southward!


Incorrect.
Member Since: 2 août 2007 Posts: 19 Comments: 19234
894. Drakoen 21:21 GMT le 29 août 2009    
Quoting BenBIogger:


Hey Drak!
8 to 10 DAY 500MB MEAN




Yes. We may be look at a flatter trough or a trough that may allow a storm to slip under it's high. The geopotential heights will be anomalously above average.
Member Since: 28 octobre 2006 Posts: 57 Comments: 29010
896. stormwatcherCI 21:21 GMT le 29 août 2009    
Quoting stormpetrol:

Ivan was forcasted originally when it developed to move more northernly into Bahamas and probably hit the east coast , maybe you can check the archive and find out.
See post 880. This comes from NHC archives.
Member Since: 9 octobre 2008 Posts: 0 Comments: 8038
897. HadesGodWyvern 21:22 GMT le 29 août 2009    
943
TCNA20 RJTD 292100
CCAA 29210 47644 KROVANH(0911) 14302 11437 132/4 2//// 93116=

21:00 PM UTC August 29 2009
STS Krovanh (0911) "14th system"
30.2N 143.7E
Member Since: 24 mai 2006 Posts: 43 Comments: 36686
898. stormwatcherCI 21:22 GMT le 29 août 2009    
Quoting StadiumEffect:


Not at the moment. I'm in Miami to finish school.
I don't mean at the moment. Are you from here or do you live here ?
Member Since: 9 octobre 2008 Posts: 0 Comments: 8038
899. jipmg 21:23 GMT le 29 août 2009    
LOL at invest 94 in the pacific, the models are completely lunatic..
900. thegoldenstrand 21:25 GMT le 29 août 2009    
It looks like the low is still behind and lower than most of the moisture in the storm and it is getting pushed north just a little for the next few hours and then depending on how far north it gets pushed either the trough above to its west draws it up further north like the models are predicting or... it resumes to the west in which case it could become a Gulf Storm in about 12-14 days. Long way to go. It looks like the wave behind it has helped get some of the dry air away from it to its northeast and also gotten the dry air away from the next wave ready to emerge off the west coast of Africa later tonight or tommorrow morning and this next bears watching too. All just potential for the moment.. so far so good for the Gulf of Mexico and the Florida Keys... but this could change with this invest and the one that should emerge behind it.
Member Since: 16 août 2008 Posts: 0 Comments: 102
901. BurnedAfterPosting 21:26 GMT le 29 août 2009    
Quoting jipmg:
LOL at invest 94 in the pacific, the models are completely lunatic..


why are they lunatic?

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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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