Dr. Jeff Masters' WunderBlog

Tropical Depression Six arrives
Posted by: Dr. Jeff Masters, 5:14 PM GMT on August 22, 2010 +4
Tropical Storm Tropical Depression Six is here, but it will not be a threat to land for at least the next five days. Tropical Depression Six is a classic "Cape Verdes"-type storm common during the peak part of hurricane season. Cape Verdes-type storms are so named because they form from tropical waves that come off the coast of Africa and pass near the Cape Verdes Islands just west of Africa. Cape Verdes hurricanes are the largest and most dangerous types of hurricane in the Atlantic, since they spend a long time over water have and have of opportunity to reach full maturity. Tropical Depression Six has a ways to go before it becomes a hurricane, as the storm is embedded in a strong easterly flow of wind courtesy of the African Monsoon that is generating a moderately high 15 - 20 knots of wind shear. There is also a tropical disturbance to the northeast of TD 6 that is sucking away some moisture and is interfering with the storm's circulation. Sea Surface Temperatures (SSTs) are a warm 28°C, and the storm is embedded in a moist environment, so wind shear is the primary inhibiting factor for development. The strong east winds imparting the shear are keeping any heavy thunderstorms from developing on the east side of the center of circulation, which is exposed to view in satellite imagery (Figure 1.)


Figure 1. Afternoon satellite image of Tropical Depression Six.

Forecast for Tropical Depression Six
A ridge of high pressure will force Tropical Depression Six to the west-northwest for the next five days, and the system should increase its forward speed from its current 10 mph to 15 mph by Monday night. A powerful trough of low pressure over the mid-Atlantic Ocean will begin to pull Tropical Depression Six more to the northwest late this week, and the storm should pass well to the northeast of the Lesser Antilles Islands. It remains to be seen, however, it this trough will be strong enough to fully recurve Tropical Depression Six out to sea. The GFS predicts that Tropical Depression Six may pass close to Bermuda about eight days from now, and it is also possible that Tropical Depression Six could eventually hit the U.S. East Coast 9 - 15 days from now. However, we have no skill in making these sort of ultra-long range forecasts, and the long-range fate of TD 6 is uncertain.

Elsewhere in the tropics
The ECMWF and NOGAPS models are predicting formation of a tropical depression off the coast of Africa 3 - 4 days from now.

Jeff Masters
Categories: Hurricane
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1201. cirrocumulus 11:15 PM GMT on August 22, 2010    
It looks like we may have hurricane status approaching imminently. What rapid development on infrared satellite!
Member Since: September 30, 2005 Posts: 0 Comments: 1606
1202. Relix 11:15 PM GMT on August 22, 2010    
Quoting Thundercloud01221991:



Although I am not saying this IS an eye I did say do you think this could be an eye or eyewall developing remember we do not always know the true intensity of these storms... for instance Hurricane Alex has a ADT number of a cat 4 hurricane (or cat 3 cant remember) but it was only a 1 at the time of the readings... so ADT can be way off and so if this is way off we could have a 65-70 mph storm????


It just formed into a tropical storm. A few hours ago in fact. It isn't gonna jump like that in so little time, trust me =P
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1203. RMM34667 11:15 PM GMT on August 22, 2010    
Quoting Ryuujin:


I just love how you discount the GFS when it's not to suit your liking, but ride it's coat-tails when it says what you want it to say IKE. Stop relying so much on Models! They're there for /guidance/ not for factual basis. It's weather, anything can happen. That's why I'm not getting suckered into "this is going to be a fish storm" especially with the GFS model's known cold bias AND the fact that almost all of the other models rely on the GFS data stream.


Where is the Question in this post?
EDIT: And the sarcasim is obvious with the "I'm gonna board up" part.
Member Since: September 7, 2006 Posts: 5 Comments: 910
1205. xcool 11:15 PM GMT on August 22, 2010    
Air Temperature (ATMP): 79.3 °F
Water Temperature (WTMP): 83.1 °F
Wind Speed (WSPD): 18.1 kts
Wind Direction (WDIR):
Member Since: September 26, 2009 Posts: 2 Comments: 15503
1206. TOMSEFLA 11:15 PM GMT on August 22, 2010    
Experimental forecast Tropical Cyclone Genesis Potential Fields
added two new models to model page
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1207. Patrap 11:15 PM GMT on August 22, 2010    
Please remember were all in this together.
Life.

Esp when we track and discuss the Current .

We all have feelings,were all not PHD's.

I made a mistake with Ike yesterday myself,,and I regret it.
But I man up and apologize and move on.


No one wants disaster or calamity. if you do,,odds r your never seen,felt,,nor smelled it.

Lets all be a lil xtra patient this week as we will likely have a Major to watch,,and also,,come the weekend,a significant Anniversary for a Event 5 years ago along the Gulf Coast.

Member Since: July 3, 2005 Posts: 372 Comments: 111607
1208. NCHurricane2009 11:15 PM GMT on August 22, 2010    
Quoting scott39:
Timing


Yeah, Timing, sometime in the next 7 to 20 days, yepper! LOL.
Member Since: September 15, 2009 Posts: 277 Comments: 3357
1209. Huracaneer 11:16 PM GMT on August 22, 2010    
While most to our eyes are focused on the far side of the Atlantic, there seems to be a trend of falling pressures and increased thunderstorm activity in the Gulf west of Florida. At the same time the CMC keeps on hinting (which I take with a grain of salt) of something developing near Florida. Is this the return of TD5, the zombie storm?
Member Since: August 21, 2007 Posts: 0 Comments: 298
1210. doorman79 11:16 PM GMT on August 22, 2010    
Quoting Patrap:
18z Early Cycle NHC model tracks
Statistical/Simple Models (CLIPER,BAMs,LBAR,other Statistical Models)



Dynamic Models (More sophisticated models)


hiya Pat!! Hows life on the southshore? We getting a nice cooling shower up on the northend!!
Member Since: August 11, 2010 Posts: 0 Comments: 895
1211. washingtonian115 11:16 PM GMT on August 22, 2010    
Quoting Patrap:
18z Early Cycle NHC model tracks
Statistical/Simple Models (CLIPER,BAMs,LBAR,other Statistical Models)



Dynamic Models (More sophisticated models)


Some of the models take it up to a major in 156.
Member Since: August 14, 2010 Posts: 5 Comments: 10665
1212. IKE 11:16 PM GMT on August 22, 2010    
Quoting plywoodstatenative:
Ike you got a reading on the buoy that door man just posted about


Which buoy?
Member Since: June 9, 2005 Posts: 23 Comments: 37044
1213. Hurricanes101 11:17 PM GMT on August 22, 2010    
Quoting RMM34667:


Where is the Question in this post?


He never said he was asking a question
Member Since: March 10, 2010 Posts: 1 Comments: 6902
1214. Patrap 11:17 PM GMT on August 22, 2010    
Quoting doorman79:
hiya Pat!! Hows life on the southshore? We getting a nice cooling shower up on the northend!!


I can see yer T-Showers tops,,and Im a rooting for it to make it here.

Been torrid today,..simply torrid.
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1215. hurricanehunter27 11:17 PM GMT on August 22, 2010    
Guys what u think of this?
Member Since: July 22, 2010 Posts: 1 Comments: 3473
1216. plywoodstatenative 11:17 PM GMT on August 22, 2010    
apparently there is a buoy near to where this storm is
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1217. smuldy 11:17 PM GMT on August 22, 2010    
Quoting Ryuujin:
I don't care if IKE reads this or not, as I can only assume that "Poof" is his clever word for putting a user on ignore. But I will postulate this for the rest of the blog that seems to wish to have a level headed discussion of both tropical formation and forecasting.

If the GFS has the storm curving out to sea continually, or having a sharp right hand turn (Ala Alex earlier in the year) because of it's known cold bias, then why are we all 100% sure of it's projected path for Danielle now? I mean, I'm not hoping this thing hits the CONUS or any of the leeward islands, or bermuda. I'm simply not sticking my head in the sand as to the possibility that a computer generated model could be wrong. What do you all think?
well said. until model consensus has a recurve within 48 hours it is reasonable to question the turn being a foregone conclusion.
Member Since: July 23, 2010 Posts: 0 Comments: 516
1218. tropics21 11:17 PM GMT on August 22, 2010    
Quoting Thundercloud01221991:



Although I am not saying this IS an eye I did say do you think this could be an eye or eyewall developing remember we do not always know the true intensity of these storms... for instance Hurricane Alex has a ADT number of a cat 4 hurricane (or cat 3 cant remember) but it was only a 1 at the time of the readings... so ADT can be way off and so if this is way off we could have a 65-70 mph storm????
definitely not an eye not strong enough yet look at the RGB on her not the AVN in fact for a bit she looked a liuttle undressed but came back under
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1219. aquak9 11:18 PM GMT on August 22, 2010    
yay taco!! hear hear!
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1220. TropicalAnalystwx13 11:18 PM GMT on August 22, 2010    
Guess who formed tomorrow 5 years ago...

HURRICANE KATRINA
Member Since: July 6, 2010 Posts: 89 Comments: 25331
1221. Patrap 11:18 PM GMT on August 22, 2010    


Member Since: July 3, 2005 Posts: 372 Comments: 111607
1222. stormtopz 11:18 PM GMT on August 22, 2010    
Quoting Huracaneer:
While most to our eyes are focused on the far side of the Atlantic, there seems to be a trend of falling pressures and increased thunderstorm activity in the Gulf west of Florida. At the same time the CMC keeps on hinting (which I take with a grain of salt) of something developing near Florida. Is this the return of TD5, the zombie storm?


I see
Member Since: August 21, 2010 Posts: 0 Comments: 48
1223. JupiterFL 11:18 PM GMT on August 22, 2010    
Quoting aquak9:
how many weeks out is 324 hours, ike? is that like, next year?

might as well be...

(dewey- it's AQUA. AQUA. As in, AQUA canine. Not AQUAK. I'm not a duck. I'm a dog.)


I always thought it was Aquak like "really crazy lady"
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1225. Ryuujin 11:19 PM GMT on August 22, 2010    
Quoting RMM34667:


Where is the Question in this post?


The question was posted actually yesterday. And it was as simple as the one I posted after. It's why the crutch like clutching to the GFS model? Why aren't we simply trying to use that as a basis, use our eyes, and use the steering currents, what the Lows actually are and where to try and give the best possible path to forecast the track of the storm? Is it just me or is that why weather forecasting has gone downhill in the last twenty years. We have this marvelous new technology and we rely on it so much to tell us it's not raining outside that we don't turn to look at the water droplets hitting our windows.
Member Since: August 20, 2010 Posts: 0 Comments: 364
1226. doorman79 11:19 PM GMT on August 22, 2010    
Quoting Patrap:


I can see yer T-Showers tops,,and Im a rooting for it to make it here.

Been torrid today,..simply torrid.
Here too till about ten minutes ago!
Member Since: August 11, 2010 Posts: 0 Comments: 895
1227. VAstorms 11:19 PM GMT on August 22, 2010    
Quoting cirrocumulus:
It looks like we may have hurricane status approaching imminently. What rapid development on infrared satellite!

No pressure change as of most recent report. One buoy does not a hurricane make.
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1228. Patrap 11:19 PM GMT on August 22, 2010    
NEXRAD Radar
New Orleans, Base Reflectivity 0.50 Degree Elevation Range 124 NMI

Member Since: July 3, 2005 Posts: 372 Comments: 111607
1229. NCHurricane2009 11:19 PM GMT on August 22, 2010    
Quoting cirrocumulus:
It looks like we may have hurricane status approaching imminently. What rapid development on infrared satellite!


If I was in Vegas, I'd be careful about betting on that statement. There is no outflow east of center, this is not the best brething environment for a system to go from minimal tropical storm to hurricane in less than a day. Its tough for Danielle to do that now.
Member Since: September 15, 2009 Posts: 277 Comments: 3357
1230. MiamiHurricanes09 11:20 PM GMT on August 22, 2010    
The circulation appears to be completely under the convection. Check it out on shortwave.
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1231. FLPandhandleJG 11:20 PM GMT on August 22, 2010    
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1232. scott39 11:20 PM GMT on August 22, 2010    
Quoting NCHurricane2009:


Thanks for confirming that with me Scott39.

By the way, if you are looking for where steering troughs are located at, check out the CIMSS products:

http://cimss.ssec.wisc.edu/tropic/real-time/atlantic/winds/winds-dlm.html

One of the best links for tropical weather I have found. I have made a forecast based on the speed of the troughs between 0300Z August 21 and 0300Z August 22.
Thanks, Great site and enjoyed you forecast.
Member Since: June 13, 2009 Posts: 0 Comments: 6207
1233. washingtonian115 11:20 PM GMT on August 22, 2010    
Quoting TropicalAnalystwx13:
Guess who formed tomorrow 5 years ago...

HURRICANE KATRINA
Boooooo that storm sucked.Never bing it up again.Lol.
Member Since: August 14, 2010 Posts: 5 Comments: 10665
1234. aquak9 11:20 PM GMT on August 22, 2010    
uhmmm...thanks Jupiter? I think?
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1235. doorman79 11:21 PM GMT on August 22, 2010    
Quoting IKE:


Which buoy?
http://www.ndbc.noaa.gov/station_page.php?station=13008
Member Since: August 11, 2010 Posts: 0 Comments: 895
1236. maryweather84 11:21 PM GMT on August 22, 2010    
good evening everyone!!! hey any one worried about the blob in the gulf? i live on se tx coast and have kiddos starting school...any answers would be great!!
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1237. Patrap 11:21 PM GMT on August 22, 2010    
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1238. TropicalAnalystwx13 11:21 PM GMT on August 22, 2010    
Hurricane Katrina's Track:



Peak Intensity:

Member Since: July 6, 2010 Posts: 89 Comments: 25331
1239. PcolaDan 11:22 PM GMT on August 22, 2010    
Quoting Ryuujin:


I'm just saying. And my questions are valid ones. Why would you ignore what I'm saying?
Quoting Hurricanes101:


He never said he was asking a question


He said "...my questions are valid ones."

And Ryuujin if you have never heard people use the term poof here you are obviously new here. Not Ike's term and used by many.
Member Since: August 22, 2008 Posts: 12 Comments: 6008
1241. IKE 11:23 PM GMT on August 22, 2010    
Quoting plywoodstatenative:
apparently there is a buoy near to where this storm is


Here's one at 12N and 38W with winds from the NNW...Link

Member Since: June 9, 2005 Posts: 23 Comments: 37044
1242. TropicalAnalystwx13 11:23 PM GMT on August 22, 2010    
QUIKSCAT of Hurricane Katrina at Category 4 Strength:

Member Since: July 6, 2010 Posts: 89 Comments: 25331
1243. JupiterFL 11:23 PM GMT on August 22, 2010    
Quoting aquak9:
uhmmm...thanks Jupiter? I think?


Come on, you get it right?

A quack is someone who offers medical treatment or advice (ie weather) without the qualifications to do so.
Member Since: August 10, 2005 Posts: 0 Comments: 2146
1245. CaptnDan142 11:24 PM GMT on August 22, 2010    
Quoting IKE:


And all I was doing was teasing.


You were teasing?!?

And to think, I ran out and bought a D-cell battery and a 1/2 liter bottle of Aquifina... I was duped. Oh well, Guess these supplies will keep. ;-)
Member Since: August 21, 2007 Posts: 0 Comments: 856
1246. Ryuujin 11:24 PM GMT on August 22, 2010    
Quoting PcolaDan:


He said "...my questions are valid ones."

And Ryuujin if you have never heard people use the term poof here you are obviously new here. Not Ike's term and used by many.


I am new here, I've stated that repeatedly, just as I've stated my questions to the blog repeatedly. It's simply obvious that some people either aren't comfortable debating them, or cannot find them.
Member Since: August 20, 2010 Posts: 0 Comments: 364
1247. Dakster 11:24 PM GMT on August 22, 2010    
Quoting aquak9:
uhmmm...thanks Jupiter? I think?


Maybe you should change your handle to waterdog so people would understand?

I like how the convective bursts in danielle are off the chart.... Does appear to be strengthening at the moment.
Member Since: March 10, 2006 Posts: 0 Comments: 4938
1249. doorman79 11:24 PM GMT on August 22, 2010    
Quoting Patrap:
NEXRAD Radar
New Orleans, Base Reflectivity 0.50 Degree Elevation Range 124 NMI

Dang it Pat, You posted the radar and now the rain has stopped. The sun is trying to peek back out.
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1251. IKE 11:25 PM GMT on August 22, 2010    
Here's another buoy at 15N and 38W....north wind and 29.87 pressure...
Member Since: June 9, 2005 Posts: 23 Comments: 37044

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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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