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
  Permalink | A A A
Reader Comments
Display: 0, 50, 100, 200 Sort: Newest First - Order Posted
Viewing: 2951 - 3001

Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66Blog Index

2951. weatherwart 12:11 PM GMT on August 23, 2010    
Quoting flstormhog:


Morning Storm,

Looks like the Left Ventricle is engorged. ;)


Congestive storm failure? ;)
Member Since: August 18, 2008 Posts: 0 Comments: 873
2953. homelesswanderer 12:14 PM GMT on August 23, 2010    
To me it looks like she's moving just north of 14n and almost due west. With all the prior stated caveats to my credentials. :)
Member Since: August 15, 2008 Posts: 10 Comments: 3665
2954. BobinTampa 12:15 PM GMT on August 23, 2010    
I would ask how many on here have more tools at their disposal and more knowledge than the NHC??

Member Since: August 14, 2008 Posts: 0 Comments: 508
2955. thebandman 12:16 PM GMT on August 23, 2010    
Quoting StormW:
Here ya go...this is in my synopsis, which I'm still typing, but try this:

Now, notice 2 things. Look in between the ridge centers, at around 40W. That is one weakness. If you look over the NC/VA area, and the flow off the Mid Atlantic coast, that's another "weakness" Even though the predominate flow is westerly, the storm is still going to "feel" or "see" these weaknesses, and have a tendency to want to head for them...the way out of the tropics, so to speak. If you take the direction toward the first break in the ridge, between the ATL ridge, that's about 315-320. The direction toward the east coast weakness is about 290. The predominate flow Danielle is in is 270. Add the numbers and divide by 3.


Now this makes sense. Thank you. I always learn from your posts.
Member Since: July 29, 2006 Posts: 0 Comments: 39
2956. wayfaringstranger 12:16 PM GMT on August 23, 2010    
Quoting StormW:
Here ya go...this is in my synopsis, which I'm still typing, but try this:

Now, notice 2 things. Look in between the ridge centers, at around 40W. That is one weakness. If you look over the NC/VA area, and the flow off the Mid Atlantic coast, that's another "weakness" Even though the predominate flow is westerly, the storm is still going to "feel" or "see" these weaknesses, and have a tendency to want to head for them...the way out of the tropics, so to speak. If you take the direction toward the first break in the ridge, between the ATL ridge, that's about 315-320. The direction toward the east coast weakness is about 290. The predominate flow Danielle is in is 270. Add the numbers and divide by 3.


So bascially in the 291-293 range.
Member Since: July 12, 2010 Posts: 0 Comments: 235
2957. CybrTeddy 12:17 PM GMT on August 23, 2010    
ECMWF is predicting the 10% off Africa will develop.
Member Since: July 8, 2005 Posts: 253 Comments: 20259
2958. PensacolaDoug 12:17 PM GMT on August 23, 2010    
Quoting BobinTampa:
I would ask how many on here have more tools at their disposal and more knowledge than the NHC??





(Hand springs up into the air)


Pick me, pick me! I know this one!!!!
Member Since: July 25, 2006 Posts: 0 Comments: 4828
2959. stillwaiting 12:17 PM GMT on August 23, 2010    
Hmmmm,morning everyone, the aoi offshore tpa might begin to orgainize if sheer relaxes...,been watching it spin since yesterday
Member Since: October 5, 2007 Posts: 20 Comments: 4970
2960. kmanislander 12:18 PM GMT on August 23, 2010    
Quoting StormW:
Here ya go...this is in my synopsis, which I'm still typing, but try this:

Now, notice 2 things. Look in between the ridge centers, at around 40W. That is one weakness. If you look over the NC/VA area, and the flow off the Mid Atlantic coast, that's another "weakness" Even though the predominate flow is westerly, the storm is still going to "feel" or "see" these weaknesses, and have a tendency to want to head for them...the way out of the tropics, so to speak. If you take the direction toward the first break in the ridge, between the ATL ridge, that's about 315-320. The direction toward the east coast weakness is about 290. The predominate flow Danielle is in is 270. Add the numbers and divide by 3.


Hi Storm,

You must be a mind reader as I was just about to post the image below. Danielle is about mid way the weakness between two bridging highs. That would account for where the system is now but as it progresses it will come under a stronger Westerly flow from the high to the West. This should flatten the track some and may already be influencing it.

Member Since: August 19, 2006 Posts: 0 Comments: 14939
2962. washingtonian115 12:19 PM GMT on August 23, 2010    
I see Danielle is organizing nicley.should be a hurricane by late tonight into tomorrow morning.And the wave off of africa could become a storm in the next few days.
Member Since: August 14, 2010 Posts: 5 Comments: 10655
2963. homelesswanderer 12:19 PM GMT on August 23, 2010    
Quoting CybrTeddy:
ECMWF is predicting the 10% off Africa will develop.


Yeah I saw that. But I'm ignoring the thing in the GOM. For now. Looks familiar some how. :)
Member Since: August 15, 2008 Posts: 10 Comments: 3665
2964. IKE 12:20 PM GMT on August 23, 2010    
Quoting barotropic:
"I know I shouldn't, as I know everyone is entitled to their opinion on Doc's blog, but I have to ask...how many of you that come on here and just make blanket statements and like stirring the pot, REALLY know anything about tropical meteorology?"

Very good point. Thats why this year I have mostly lurked. While this board has some knowledgeable folks on it, most are wishcasters to the hilt. That is in the often times face of fact, they have a sign on their foreheads that says "Please come hit me, I want a hurricane so bad", we CAN make this happen attitude. I mean some of you on this board I know are laughing right now because what I am saying is so so true! Case in point, a model consensus on a hurricane pointing directly at south Florida. Many "knowledgable folks on this board take issue when someone suggests that the storm will miss south florida and as a matter of fact, actually get pissed off. Yet, the same scenario with a solid model consensus of a storm recurving, they take issue with those that may suggest that florida or the US is pretty much out of the woods. So even those with knowledge often times on this site are highly biased. As a matter of fact, I read this board for entertainment. If I want an opinion I can read the numerous discussions issued by the NWS and the TPC. Those discussions are arrived at after some of the sharpest minds in tropical meteorology have reviewed the facts, the models and than added the human factor and opinion. What more do you need?


I can't argue with anything you said and I read it 3 times. I agree with your comments.
Member Since: June 9, 2005 Posts: 23 Comments: 37044
2965. scott39 12:21 PM GMT on August 23, 2010    
Quoting StormW:
Here ya go...this is in my synopsis, which I'm still typing, but try this:

Now, notice 2 things. Look in between the ridge centers, at around 40W. That is one weakness. If you look over the NC/VA area, and the flow off the Mid Atlantic coast, that's another "weakness" Even though the predominate flow is westerly, the storm is still going to "feel" or "see" these weaknesses, and have a tendency to want to head for them...the way out of the tropics, so to speak. If you take the direction toward the first break in the ridge, between the ATL ridge, that's about 315-320. The direction toward the east coast weakness is about 290. The predominate flow Danielle is in is 270. Add the numbers and divide by 3.
round off to 290
Member Since: June 13, 2009 Posts: 0 Comments: 6207
2966. 7544 12:21 PM GMT on August 23, 2010    
morning all looks like our ts doent want to play the model game and is going further south and moving west as of this hour . will this make the next run in a shift to the west . and will this be trend . as danaile misses the first trof . and she stalls that would give time for the high to build in and move her more west ? tia enjoy your coffee
Member Since: May 6, 2007 Posts: 0 Comments: 5925
2967. CybrTeddy 12:22 PM GMT on August 23, 2010    
Quoting CybrTeddy:
ECMWF is predicting the 10% off Africa will develop.


GFS also develops this.


Member Since: July 8, 2005 Posts: 253 Comments: 20259
2968. poknsnok 12:22 PM GMT on August 23, 2010    
Quoting CybrTeddy:
ECMWF is predicting the 10% off Africa will develop.


and be a fish

Member Since: August 17, 2008 Posts: 0 Comments: 222
2969. homelesswanderer 12:23 PM GMT on August 23, 2010    
Quoting BobinTampa:
I would ask how many on here have more tools at their disposal and more knowledge than the NHC??



I don't have what they have. Just my eyes and opinion. I could be completely wrong about where I see the center and how I think it's moving. But at least they let the under qualified like me make a complete fool of myself on this blog if I so choose. :)
Member Since: August 15, 2008 Posts: 10 Comments: 3665
2971. twhcracker 12:24 PM GMT on August 23, 2010    
Quoting StormW:


How about the same tools and same knowledge.


how about less tools and knowlege but great psychic powers.
Member Since: July 30, 2007 Posts: 6 Comments: 1448
2972. weatherguy03 12:25 PM GMT on August 23, 2010    
Member Since: July 5, 2005 Posts: 581 Comments: 29680
2973. BobinTampa 12:26 PM GMT on August 23, 2010    
Quoting StormW:


How about the same tools and same knowledge.


I would say that's probably a bit aggressive. NHC has a multi-million dollar budget. If you can do the same work as them out of your house, you should write Obama a letter. He's looking to cut budget.

And this isn't to bash you. I look forward to your posts. But the NHC bashing on here gets ridiculous sometimes. What is the NHC's motivation to put out incorrect information??
Member Since: August 14, 2008 Posts: 0 Comments: 508
2974. SeaMule 12:27 PM GMT on August 23, 2010    
Quoting StormW:
I know I shouldn't, as I know everyone is entitled to their opinion on Doc's blog, but I have to ask...how many of you that come on here and just make blanket statements and like stirring the pot, REALLY know anything about tropical meteorology?



How many meteoroligists really know for sure where this storm is headed? I haven't seen the first "expert" forecast a path south of where the "experts" thought it was going. This blog might go the way of FLhurricane.com...where unless you are some "expert"...your opinions and guesses aren't wanted. You will never hear them say...
"I really don't understand why the storm is heading more west than we thought. Then we they see the storm doing something that wasn't anticipated, they pretend to have covered their bases. Truth of the matter...the mets aren't right all the time...and I hate to think I'd have to listen to only experts. I'll take a free for all forum anyday. some people are just full of themselves, I guess
Member Since: October 29, 2007 Posts: 0 Comments: 113
2975. ryang 12:31 PM GMT on August 23, 2010    
Member Since: August 25, 2006 Posts: 329 Comments: 12333
2976. IKE 12:31 PM GMT on August 23, 2010    
Quoting StormW:


Well, I can...model consensus...still ain't happened yet. It will or should, but not yet. And the GFS that everyone worships, had her taking the hard north at 40W earlier in the period...where is the storm now?


The storm is close to where the NHC thought it was going to be at this time.

Here's the 36 hour forecast by the NHC issued at 5pm EDST Saturday....

36HR VT 23/0600Z 13.6N 38.2W 55 KT

Here's where it was.....

INITIAL 23/0900Z 14.8N 37.1W 50 KT
........

The NHC has a track well north and east of the islands. The NHC has a track east of Bermuda. Those are the most important things. No one is perfect on a forecast.

Member Since: June 9, 2005 Posts: 23 Comments: 37044
2977. smuldy 12:32 PM GMT on August 23, 2010    
Quoting BobinTampa:
I would ask how many on here have more tools at their disposal and more knowledge than the NHC??

ok cool then we can save some money cancel JMs blog and the comments and just read what NHC posts. Jees. Do they know the most? Well even - Max Mayfield prolly. But does that mean we shouldnt ever debate and agree or dissent?
Member Since: July 23, 2010 Posts: 0 Comments: 516
2978. weatherwart 12:32 PM GMT on August 23, 2010    
I don't much at all. The only thing I can say is nobody is right all the time with forecasting these storms, not the mets, not the people here, and certainly not the general public. Heck, most of them are oblivious and that's NOT a good thing.
Member Since: August 18, 2008 Posts: 0 Comments: 873
2979. hercj 12:32 PM GMT on August 23, 2010    
Quoting StormW:


Well, I can...model consensus...still ain't happened yet. It will or should, but not yet. And the GFS that everyone worships, had her taking the hard north at 40W earlier in the period...where is the storm now?

Senior, I have looked at this from 3 different satellite's and the best I can do is 275 - 280. Where is the COC?
Member Since: September 5, 2009 Posts: 0 Comments: 319
2980. Scimet 12:32 PM GMT on August 23, 2010    
It appears that Danielle will only be a threat to marine interests in the north central Atlantic. Anyone knows what the forecast models are saying about the new disturbance off the African coast and what possible track it might take? Perhaps it's too early to know whether the same troughs (that will steer Danielle northeast) will impact this disturbance.
Member Since: July 5, 2010 Posts: 0 Comments: 10
2981. surfmom 12:33 PM GMT on August 23, 2010    
Quoting stillwaiting:
Hmmmm,morning everyone, the aoi offshore tpa might begin to orgainize if sheer relaxes...,been watching it spin since yesterday


me too !!! very confused about it & I don't know how to frame an intelligent question LOL
Still, missed the post if you answered this yesterday
are the Tarpon running on our shoreline/Siesta Key now? have you seen any mean-finned ones?
Member Since: July 18, 2007 Posts: 30 Comments: 26538
2982. Stormchaser2007 12:33 PM GMT on August 23, 2010    
Member Since: June 9, 2007 Posts: 4 Comments: 15248
2983. wunderkidcayman 12:34 PM GMT on August 23, 2010    
hey Kman hmm I think it might even be possible for our TS to feel the next high and maybe turn from west to WSW then moves back W-WNW accordingf to that map you posted
Member Since: June 13, 2009 Posts: 2 Comments: 5449
2984. stormwatcherCI 12:34 PM GMT on August 23, 2010    
Member Since: October 9, 2008 Posts: 0 Comments: 8040
2986. mrpuertorico 12:36 PM GMT on August 23, 2010    
Quoting hercj:

Senior, I have looked at this from 3 different satellite's and the best I can do is 275 - 280. Where is the COC?


looks like center due south of next nhc forecast point
Member Since: July 10, 2006 Posts: 0 Comments: 833
2987. kmanislander 12:36 PM GMT on August 23, 2010    
Quoting wunderkidcayman:
hey Kman hmm I think it might even be possible for our TS to feel the next high and maybe turn from west to WSW then moves back W-WNW accordingf to that map you posted


I think a track more to the West short term but those two highs will not sit still. It would take a very strong high to force a strengthening storm to the S of a Westerly heading. Of course, it is always possible but not probable IMO.

Member Since: August 19, 2006 Posts: 0 Comments: 14939
2988. hercj 12:37 PM GMT on August 23, 2010    
Quoting BobinTampa:


no, not at all. I'm on your side on this one. StormW's post was basically saying "you guys don't know as much as me so shut up and listen."

I was responding to that.

No it wasn't. Storm never says ANYTHING like that. He posts his best EDUCATED analysis of the feature for anyone to read.
Member Since: September 5, 2009 Posts: 0 Comments: 319
2989. wayfaringstranger 12:37 PM GMT on August 23, 2010    
Easy guys

There is a lot to learn from watching Danielle.

There is no sense in bashing anyone or questioning credentials.

All the ladies on the blog are so cival. Do us fellas really have that much of an issue getting along with others?

Anyway, moving on.....
Member Since: July 12, 2010 Posts: 0 Comments: 235
2992. stormwatcherCI 12:38 PM GMT on August 23, 2010    
Quoting mrpuertorico:


looks like center due south of next nhc forecast point
I don't know how to post a link but if you look at NHC rainbow loop with the forecast points it IS due south and definitely moving almost due west.
Member Since: October 9, 2008 Posts: 0 Comments: 8040
2993. Stormchaser2007 12:38 PM GMT on August 23, 2010    
Rather impressive tropical wave.

Member Since: June 9, 2007 Posts: 4 Comments: 15248
2994. SLU 12:39 PM GMT on August 23, 2010    
991

WHXX01 KWBC 231237

CHGHUR

TROPICAL CYCLONE GUIDANCE MESSAGE

NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL

1237 UTC MON AUG 23 2010



DISCLAIMER...NUMERICAL MODELS ARE SUBJECT TO LARGE ERRORS.

PLEASE REFER TO NHC OFFICIAL FORECASTS FOR TROPICAL CYCLONE

AND SUBTROPICAL CYCLONE INFORMATION.



ATLANTIC OBJECTIVE AIDS FOR



TROPICAL CYCLONE DANIELLE (AL062010) 20100823 1200 UTC



...00 HRS... ...12 HRS... ...24 HRS. .. ...36 HRS...

100823 1200 100824 0000 100824 1200 100825 0000



LAT LON LAT LON LAT LON LAT LON

BAMS 14.8N 38.7W 15.7N 40.9W 17.2N 43.6W 19.1N 46.5W

BAMD 14.8N 38.7W 15.8N 41.3W 17.0N 43.6W 18.9N 45.7W

BAMM 14.8N 38.7W 15.9N 41.1W 17.2N 43.8W 19.1N 46.4W

LBAR 14.8N 38.7W 15.8N 41.3W 17.0N 44.3W 18.4N 47.3W

SHIP 50KTS 62KTS 74KTS 82KTS

DSHP 50KTS 62KTS 74KTS 82KTS



...48 HRS... ...72 HRS... ...96 HRS. .. ..120 HRS...

100825 1200 100826 1200 100827 1200 100828 1200



LAT LON LAT LON LAT LON LAT LON

BAMS 20.9N 49.6W 22.8N 53.3W 25.1N 52.0W 31.0N 51.5W

BAMD 21.1N 47.6W 26.3N 50.4W 30.3N 51.4W 34.1N 52.8W

BAMM 21.0N 48.9W 24.1N 52.2W 26.7N 52.2W 31.3N 51.7W

LBAR 19.8N 50.3W 23.7N 54.2W 28.0N 54.8W 31.4N 53.9W

SHIP 89KTS 95KTS 91KTS 88KTS

DSHP 89KTS 95KTS 91KTS 88KTS



...INITIAL CONDITIONS...

LATCUR = 14.8N LONCUR = 38.7W DIRCUR = 290DEG SPDCUR = 14KT

LATM12 = 13.9N LONM12 = 35.9W DIRM12 = 293DEG SPDM12 = 14KT

LATM24 = 12.2N LONM24 = 33.9W

WNDCUR = 50KT RMAXWD = 15NM WNDM12 = 40KT

CENPRS = 994MB OUTPRS = 1012MB OUTRAD = 240NM SDEPTH = M

RD34NE = 45NM RD34SE = 45NM RD34SW = 60NM RD34NW = 60NM



$$

NNNN
Member Since: July 13, 2006 Posts: 11 Comments: 2851
2997. kmanislander 12:39 PM GMT on August 23, 2010    
Quoting StormW:


I've got it near 14.8N 39.0W


When I first came on this morning I placed it at 14.5 N and 38.5 W so those numbers look pretty good to me.
Member Since: August 19, 2006 Posts: 0 Comments: 14939
2998. pottery 12:39 PM GMT on August 23, 2010    
Good Morning, from a Bright and Suynny island.
It looks like we will get a few days of mostly hot conditions as Danielle tends to draw the moist stuff away from here
D. looks good this morning.
And a little something behind....
And a larger something in the EPAC....
Going to be a fun couple of days/weeks/months.
Member Since: October 24, 2005 Posts: 0 Comments: 20708
2999. hercj 12:39 PM GMT on August 23, 2010    
Quoting StormW:


I've got it near 14.8N 39.0W

So its under the convection? NHC keeps saying it's on the eastern side but I can't see that.
Member Since: September 5, 2009 Posts: 0 Comments: 319
3000. nrtiwlnvragn 12:40 PM GMT on August 23, 2010    
The "holier-than-thou" attitude is really getting old and stale.
Member Since: September 23, 2005 Posts: 11 Comments: 8936
3001. smuldy 12:40 PM GMT on August 23, 2010    
Quoting BobinTampa:


no, not at all. I'm on your side on this one. StormW's post was basically saying "you guys don't know as much as me so shut up and listen."

I was responding to that.
oh ok sorry totally misread sarcasm and text and all lol; i respect whatever stormw wants to think cause i get 90% of my info from him and some are ridiculous with their one line fishstorm not fishstorm posts and if he meant novice casters like me he and he alone here has the right so i just shut my mouth and apologized if i came off to the very valuable experts here in any annoying way save for my humor posts
Member Since: July 23, 2010 Posts: 0 Comments: 516

Viewing: 2951 - 3001

Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66Blog Index

New Comment
Community Standards Policy Comments will take a few seconds to appear.
Post Your Comments
Please sign in to post comments.
Not only will you be able to leave comments on this blog, but you'll also have the ability to upload and share your photos in our Wunder Photos section.
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.

Local Weather
Light Rain
48 °F
Light Rain Mist
Community Activity