Dr. Jeff Masters' WunderBlog

Bonnie barely alive
Posted by: Dr. Jeff Masters, 12:58 PM GMT on July 24, 2010 +3
Tropical Depression Bonnie is barely clinging to life. Wind shear of 25 knots and dry air from an upper-level low pressure system over the Gulf of Mexico are taking their toll on Bonnie, which is now just a swirl of low clouds accompanied by a small clump of heavy thunderstorms on the north side of the center of circulation. These thunderstorms are now visible on New Orleans long range radar, and will arrive in coastal Louisiana early this afternoon, well ahead of the center. The Hurricane Hunters are in Bonnie, and have found a much weaker storm with top winds of just 30 mph.


Figure 1. Morning satellite image of Tropical Depression Bonnie. At the time, Bonnie had sustained winds of 30 mph.

Forecast for Bonnie
The current NHC forecast for Bonnie looks good, with the storm making landfall in Louisiana near 9pm CDT Saturday night. According to the latest tide information, this will be near the time of low tide. This will result in much less oil entering the Louisiana marshlands than occurred during Hurricane Alex in June. That storm brought a storm surge of 2 - 4 feet and sustained winds of 20 - 30 mph that lasted for several days, including several high tide cycles. Bonnie will be lucky to be a tropical depression at landfall, and should only create a storm surge of 1 - 2 feet that will come at low tide. This will result in a storm tide level that will inundate land to at most one foot above ground level.

Resources for the BP oil disaster
Map of oil spill location from the NOAA Satellite Services Division
My post, What a hurricane would do the Deepwater Horizon oil spill
My post on the Southwest Florida "Forbidden Zone" where surface oil will rarely go
My post on what oil might do to a hurricane
NOAA's interactive mapping tool to overlay wind and ocean current forecasts, oil locations, etc.
Gulf Oil Blog from the UGA Department of Marine Sciences
Oil Spill Academic Task Force
University of South Florida Ocean Circulation Group oil spill forecasts
ROFFS Deepwater Horizon page
Synthetic Aperture Radar (SAR) imagery from the University of Miami

Elsewhere in the tropics
There are no other threat areas of concern today. The only model calling for possible tropical development in the next week is the NOGAPS model, which predicts a strong tropical disturbance could form off the coast of Nicaragua in the Southwest Caribbean about a week from now.

Next update
The next updates will be by wunderground meteorologists Rob Carver and Shaun Tanner. I'm taking advantage of a break in the tropical action to take a few days away. I'll be back blogging on Friday, at the latest.

Jeff Masters
Categories: Hurricane
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501. seflagamma 7:50 PM GMT on July 24, 2010    
Quoting Levi32:


Lol. I don't think so.


I like the term "Mischeif" myself! :o)
and disagree with post 487...
Member Since: August 29, 2005 Posts: 286 Comments: 40485
502. CanesfanatUT 7:50 PM GMT on July 24, 2010    
Quoting sammywammybamy:
Look at Miami...



Huh. That is interesting. Was surprised to see Va Beach up that high. I thought it would have been NO or Tampa #2.
Member Since: September 3, 2007 Posts: 0 Comments: 459
503. Hurricanes101 7:50 PM GMT on July 24, 2010    
Quoting unf97:


This is a fairly broad question. Do you mean what point in longitude or latitude?


both

as in lets say the coordinate 24N 77W has the distinction of having more storms tracks pass through it than any other point in the Atlantic Basin
Member Since: March 10, 2010 Posts: 1 Comments: 6902
504. unf97 7:53 PM GMT on July 24, 2010    
Quoting hunkerdown:
ahhh...coordinate would be the position, i.e longitude and latitude


It's still a broad question. He is looking for a fixed position of where most storms pass through in the Atlantic basin right?
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505. Orcasystems 7:54 PM GMT on July 24, 2010    
Gaining a bit of strength.



AOI
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506. hunkerdown 7:54 PM GMT on July 24, 2010    
Quoting unf97:


It's still a broad question. He is looking for a fixed position of where most storms pass through in the Atlantic basin right?
no, he is looking for the fixed position that have had the most storms pass through
Member Since: August 15, 2008 Posts: 0 Comments: 2514
507. Hurricanes101 7:54 PM GMT on July 24, 2010    
Quoting unf97:


It's still a broad question. He is looking for a fixed position of where most storms pass through in the Atlantic basin right?


yes and that is not a broad question or else you wouldn't use the term fixed point
Member Since: March 10, 2010 Posts: 1 Comments: 6902
509. bappit 7:55 PM GMT on July 24, 2010    
I can't wait for that ole mischief myself. Good times ahead.
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510. Asta 7:55 PM GMT on July 24, 2010    
Quoting atmoaggie:

All TCs:


As for the world, The Philippines might have an argument.

Typhoons 1980 to 2005:

LOL!! Looks like my Chickens scratched up the map!!
Member Since: July 4, 2008 Posts: 30 Comments: 1018
511. CanesfanatUT 7:55 PM GMT on July 24, 2010    
Quoting bappit:
"Mischeif" is a good spelling for an obnoxious phrase. Just look at the death and destruction done by tropical systems or simple interruption of daily life (see CanesFanatUT and southlousiana's posts) that can cause significant economic repercussions. Not saying that anyone using the mischief phrase is a wishcaster, of course. The term is just inappropriate.


That's a little over done, honestly. I wouldn't say inappropriate.

It's just a term they are using to tell folks on this blog "hey watch this area - I'm not saying it's Wilma Pt 2 but you might want to take a look".
Member Since: September 3, 2007 Posts: 0 Comments: 459
512. atmoaggie 7:55 PM GMT on July 24, 2010    
Quoting ElConando:


You might get some gusts near 30 mph look out for it.
I live in the woods, essentially. I doubt the gusts will be that high with all of the wind drag I have surrounding me.

Now, if I went down to the lakefront, yeah, maybe.
Member Since: August 16, 2007 Posts: 6 Comments: 12461
513. unf97 7:56 PM GMT on July 24, 2010    
Quoting hunkerdown:
no, he is looking for the fixed position that have had the most storms pass through


OK just wanted to clarify. Sorry about that. Based on the tropical cyclone history map someone posted on this page a bit earlier I would hedge a guess and say 25.0N and 74.0 or 75.0 W.
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514. IKE 7:56 PM GMT on July 24, 2010    
Not sure if this has already been posted...12Z ECMWF shows little to nothing significant through August 2nd.

Here's the eastern Atlantic view...nothing.
Member Since: June 9, 2005 Posts: 23 Comments: 37044
516. seflagamma 7:57 PM GMT on July 24, 2010    
Quoting Orcasystems:
Gaining a bit of strength.



AOI



Orca, what is that? sometimes I do not understand just a post of a map..

is that something forming????
Member Since: August 29, 2005 Posts: 286 Comments: 40485
517. CanesfanatUT 7:57 PM GMT on July 24, 2010    
Quoting atmoaggie:

All TCs:


As for the world, The Philippines might have an argument.

Typhoons 1980 to 2005:


Your kid take a crayon to that map???

I can't even see the Philippines. Geez
Member Since: September 3, 2007 Posts: 0 Comments: 459
518. Orcasystems 7:58 PM GMT on July 24, 2010    
Quoting DestinJeff:


every 1 mb drop in pressure brings 5 bloggers back on


Is slowly dropping.... key word...S l o w l y
Member Since: October 1, 2007 Posts: 77 Comments: 26077
519. MechEngMet 7:58 PM GMT on July 24, 2010    
Good afternoon all. May I celebrate the lack of impact from Bonnie yet? I haven't gotten a bit of rain or any breezes yet. I'll gladly take all of these weak-things mother nature can send.

Atmo: I'll keep an eye out for those pesky falling pine-needles though. We've got a few of them around here ready to break off at any minute. They might even bend a blade of grass on my lawn as they impact. (Shudder the thought)

LOL!!! Bonnie?! Nya nya!
Member Since: April 13, 2010 Posts: 0 Comments: 353
521. Orcasystems 7:59 PM GMT on July 24, 2010    
Quoting seflagamma:



Orca, what is that? sometimes I do not understand just a post of a map..

is that something forming????


It shows the latest HH information and location of the Vortex reports.

For Bonnie.. or what ever you want to call it now :)
Member Since: October 1, 2007 Posts: 77 Comments: 26077
522. atmoaggie 7:59 PM GMT on July 24, 2010    
Quoting CanesfanatUT:


Huh. That is interesting. Was surprised to see Va Beach up that high. I thought it would have been NO or Tampa #2.

Return frequency for landfalling TCs in an area is prolly the best way to gauge this. (CAVEAT: Some areas simply didn't have people along the coast for substantial portions of our records going back to the mid-1800s).

For cat 1:



For cat 3:



More here: http://www.nhc.noaa.gov/HAW2/english/basics/return.shtml
Member Since: August 16, 2007 Posts: 6 Comments: 12461
523. bluehaze27 7:59 PM GMT on July 24, 2010    
Do you guys think there will be a persistence in the atmospheric patterns that would continue to all storms to go north of hispanola but generally westward? Accuweather has a graphic that shows a congregation of tracks that's pretty scary for Florida.Link
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524. atmoaggie 8:00 PM GMT on July 24, 2010    
Quoting CanesfanatUT:


Your kid take a crayon to that map???

I can't even see the Philippines. Geez
Nor Taiwan.
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525. bappit 8:00 PM GMT on July 24, 2010    
Let's lay some bodies out and talk about mischief.
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527. hunkerdown 8:01 PM GMT on July 24, 2010    
Quoting DestinJeff:
This season is a bus.

no, a bust



or a a bust...


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528. Seflhurricane 8:01 PM GMT on July 24, 2010    
Quoting sammywammybamy:
Florida Hurricane Capital of the World?

and this is major's only! not counting Cat2 and below!


and that chart is wrong because hurricane Andrew was in August 24, 1992 not september
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529. unf97 8:01 PM GMT on July 24, 2010    
Quoting Hurricanes101:


both

as in lets say the coordinate 24N 77W has the distinction of having more storms tracks pass through it than any other point in the Atlantic Basin


Oh you gave the answer Hurricanes101. I did not realize it at first LOL. I hedged a guess a few posts back but it was a close guess to the actual answer.

That makes sense the answer because it is at this point where many cyclones recurve out into the Atlantic.
Member Since: September 25, 2007 Posts: 0 Comments: 1193
530. hurricane23 8:02 PM GMT on July 24, 2010    
As far as possible U.S. landfalls for the remainder of the season, it is still just too early to make a definitive forecast as to where the majority of TC's will track during the remainder of the season. That being said, I do not personally expect that the U.S. will make it through the 2010 hurricane season without multiple hurricane landfalls and at least one major land falling event. It is important to remember that 30 days is a very long time in attempting to forecast the probable atmospheric set up with regards to the upper level steering currents. Even then, it is still possible for an unforeseen trough to come along and steer a particular TC farther N and away from the U.S. Consequently, any respective track forecasts outside of 7-10 days carries a very large degree of possible error. Regardless, I do anticipate that Florida will encounter at least 1-2 hurricane landfalls before this particular hurricane season comes to a close. I also expect that there will be at least 2-3 land falling hurricanes and at least one major hurricane landfall in the U.S. during the season. We will just simply have to wait and see what actually does materialize during the succeeding 3 months or so.

adrian
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531. earthlydragonfly 8:02 PM GMT on July 24, 2010    
Quoting bappit:

Sounds like the law of small numbers at work. Here's a Wikipedia reference.


I tend to agree. however one cannot ignore the fact of how the season set up, although not law, but just a point of reference... Simular to what we spoke of earlier on the probability of precipitation... when it is a 10% chance of rain it really means that when the day sets up this way 100 times it rains 10 times.. Simular in a greater way to the tropical season.... If the AB high and other variables such as el nino, la nina, sst, shear and the strengths of all of those factors and more will affect the tropics on the greater scale. IMO all of these things will present tendencies in the weather patterns and therefore increasing the probability that storms will go certian places... Not every time since the variables are not a constant.
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532. Hurricanes101 8:03 PM GMT on July 24, 2010    
Quoting unf97:


Uh You gave the answer Hurricanes101. LOL. I hedged a guess a few posts back but it was a close guess to the actual answer.

That makes sense the answer becuase it is at this point where many cyclones recurve out into the Atlantic.


it was an example, the question was not a trivia question; I do not know the answer, I was looking for one.
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533. jlp09550 8:04 PM GMT on July 24, 2010    
Almost looks like what's left of Bonnie in the north-eastern GOM is moving due west or almost stationary.

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534. unf97 8:04 PM GMT on July 24, 2010    
Quoting Hurricanes101:


it was an example, the question was not a trivia question; I do not know the answer, I was looking for one.


Oh OK LOL.. I thought you gave the actual answer. Well then that remains a very good question to pose to an expert like StormW or Dr. Masters.
Member Since: September 25, 2007 Posts: 0 Comments: 1193
536. earthlydragonfly 8:05 PM GMT on July 24, 2010    
Quoting earthlydragonfly:


I tend to agree. however one cannot ignore the fact of how the season set up, although not law, but just a point of reference... Simular to what we spoke of earlier on the probability of precipitation... when it is a 10% chance of rain it really means that when the day sets up this way 100 times it rains 10 times.. Simular in a greater way to the tropical season.... If the AB high and other variables such as el nino, la nina, sst, shear and the strengths of all of those factors and more will affect the tropics on the greater scale. IMO all of these things will present tendencies in the weather patterns and therefore increasing the probability that storms will go certian places... Not every time since the variables are not a constant.
of course I could be just stupid...
Member Since: July 1, 2005 Posts: 10 Comments: 1649
537. atmoaggie 8:07 PM GMT on July 24, 2010    
Quoting hunkerdown:
no, a bust



or a a bust...


Nice bust...
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539. turtlegirl9 8:09 PM GMT on July 24, 2010    
97oW 22oN in Gulf of Mexico. Is it an optical illusion? It looks like circulation. Even so its right on the shoreline so no real chance of further development. Just looked at satellite and it caught my eye.
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541. bluehaze27 8:10 PM GMT on July 24, 2010    
Thanks hurricane23 and StormW...it will be interesting in a few weeks.
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542. seflagamma 8:10 PM GMT on July 24, 2010    
thanks!
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544. unf97 8:11 PM GMT on July 24, 2010    
Quoting turtlegirl9:
97oW 22oN in Gulf of Mexico. Is it an artificial illusion? It looks like circulation. Even so its right on the shoreline so no real chance of further development. Just looked at satellite and it caught my eye.


Surface trough located right on the coast of Southern Mexico. There is a spin there but the system is likely to keep moving inland into Mexico.
Member Since: September 25, 2007 Posts: 0 Comments: 1193
546. hurricane23 8:12 PM GMT on July 24, 2010    
Quoting bluehaze27:
Thanks hurricane23 and StormW...it will be interesting in a few weeks.


No problem! I'am with stormw on a very busy season just around the corner.
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547. atmoaggie 8:12 PM GMT on July 24, 2010    
Ooooo, you should prolly put up one a little different...

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549. bappit 8:16 PM GMT on July 24, 2010    
.
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550. turtlegirl9 8:22 PM GMT on July 24, 2010    
Quoting unf97:


Surface trough located right on the coast of Southern Mexico. There is a spin there but the system is likely to keep moving inland into Mexico.


Thanks!
Member Since: August 13, 2009 Posts: 0 Comments: 16
551. atmosweather 8:24 PM GMT on July 24, 2010    
Afternoon guys and girls!

Well at least we don't need HH data to see the center of Bonnie/remnant low!
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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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