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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2251. txsweetpea 3:35 AM GMT on August 23, 2010    
Quoting CyclonicVoyage:


I use IKE as an example because Broward EOC was fully activated on high alert and briefing the public on near future EVAC orders due to CAT 4 IKE's arrival, oops.

It is NOT impossible for this to go further west ...I agree with you and there have been alot of storm tracks that have. I do realize that it all depends all depends onthe strength of Danielle and the troughs /ridging. If the troughs/ridging dont move according to planned this could play an important role also.
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2252. FLPandhandleJG 3:35 AM GMT on August 23, 2010    
Ho77ywood..

Yeah same here.. but it didnt start 12:30 in the afternoon.. then off and on til like 6ish.. Had a nice storm came through around 4 when I went to BestBuy today.. I think I will get more rain tomorrow like I did the last few days or so..
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2253. Chicklit 3:35 AM GMT on August 23, 2010    


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2254. PcolaDan 3:36 AM GMT on August 23, 2010    
Quoting Halyn:
Would someone please post a pic of her area so she can see what is happening ?


Heavy line of thunderstorms coming through. Looks to passing pretty quickly.

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2255. Neapolitan 3:36 AM GMT on August 23, 2010    
Quoting Halyn:
Would someone please post a pic of her area so she can see what is happening ?


Well, what is BR? Boca Raton? Baton Rouge? Brazil? Banana Republic?
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2256. FLPandhandleJG 3:36 AM GMT on August 23, 2010    
Quoting MississippiWx:
I'm out, everyone. Don't let the GFS put Danielle on our doorstep next week. Night.

Goodnight!
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2258. KoritheMan 3:36 AM GMT on August 23, 2010    
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2259. txsweetpea 3:37 AM GMT on August 23, 2010    
Quoting crashingwaves:



I agree here, no one knows for sure what's going to happen down the road. Even jeff Masters quoted as saying "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. So nothing is certain at this point, I've seen the models predict this and that, only to see a storm barreling down on us. I say wait & see if the 2 troughs will steer Danielle out to sea.jmo

Absolutely right!
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2260. Halyn 3:37 AM GMT on August 23, 2010    
Thank you, Dan .. :)
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2261. CyclonicVoyage 3:37 AM GMT on August 23, 2010    
Quoting truecajun:
seiously. the north winds are literally howling. the cat is freaking out. of course, the local channels aren't telling me anyhting.


Looks like a gust front developed out ahead of the storm complex, straight line winds.

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2262. ho77yw00d 3:38 AM GMT on August 23, 2010    
goodnight everyone cant wait until morning to see Danielle lol :) nite
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2263. txsweetpea 3:38 AM GMT on August 23, 2010    
Quoting KoritheMan:
For those interested, I just wrote a blog on Danielle.

Always interested!
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2264. AllStar17 3:38 AM GMT on August 23, 2010    
Don't forget about the wave behind Danielle. It's father south and could sneak up on some people.





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2265. truecajun 3:38 AM GMT on August 23, 2010    
Quoting Neapolitan:


Well, what is BR? Boca Raton? Baton Rouge? Brazil? Banana Republic?


LOL! sorry i didn't realize that i put BR. that was silly. Baton Rouge. i really haven't heard wind like this except during canes. it's really strange that the local channels aren't saying anything. there is no rain, just constant howling winds and a little thunder in the distant north.
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2266. LADobeLady 3:39 AM GMT on August 23, 2010    
Quoting CyclonicVoyage:


Looks like a gust front developed out ahead of the storm complex, straight line winds.



The winds are ripping, more from this that we got from TD5 and XTD5
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2267. cirrocumulus 3:39 AM GMT on August 23, 2010    
It seems the center of Danielle may relocate to the southwest. It is still in the early stages.
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2268. FLPandhandleJG 3:39 AM GMT on August 23, 2010    
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2269. awp5141 3:39 AM GMT on August 23, 2010    
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2271. HadesGodWyvern 3:39 AM GMT on August 23, 2010    
** WTPQ20 BABJ 230300 ***
SUBJECTIVE FORECAST
TS MINDULLE 1005 (1005) INITIAL TIME 230300 UTC
00HR 16.1N 110.4E 988HPA 20M/S (40 knots)
30KTS 100KM
P12HR WNW 15KM/H=

China Meteorological Administration
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2272. TampaSpin 3:40 AM GMT on August 23, 2010    


We need to watch these time frames. If Danielle is delayed one day by a point on this graphic she might miss her point of parking and ask for a more upscale landfall and cost a lot more.
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2273. wunderkidcayman 3:40 AM GMT on August 23, 2010    
anyway guys I am off till early morning I will see what our TS is doing
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2274. Hurricanes101 3:40 AM GMT on August 23, 2010    
Quoting cirrocumulus:
It seems the center of Danielle may relocate to the southeast. It is still in the early stages.


the circulation is very strong, a relocation is unlikely at this stage
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2276. smuldy 3:40 AM GMT on August 23, 2010    
I'll go against the crowd. This is speculation this far out especially given model continuity, but I still refuse to buy a trough that deep and strong in August. IF the storm ramps up by tomorrow it could very well use its outflow to STRENGTHEN the ridge to its north. Given that the models forecast nearly a northerly movement from where it is, AND that even the NHC concedes it will head WNW for the next 48 hours, I find it highly troubling to call the models reliable as yet. Should the storm defy expectations, continue to feel a weakness to its north in the ridge, and should the ridge of high pressure break apart allowing a giant august nor'easter to form allowing a trough of low pressure to dip to 20n then the models will verify. At this time I have about 25% confidence of that happening. Where it goes will depend entirely on which components pan out and which do not, but until it recurves, or until the ridge weakens or splits, or until the large trough dips down at such an enormous strength, this needs to be watched by just about everyone on the Atlantic coastline or in Bermuda. Tropical cyclones are very difficult to predict, but given the number of extremely unusual components factored into the model forecast runs and given the current conditions showing little sign that these anomalies are shaping up save for computer runs, I feel this may well be the storm that models have the toughest time getting a handle on for this entire season in so far as track. Everyone should pay attention closely over the next few days to a)strength of the cyclone and its outflow b)latitude c) the mid atlantic ridge and d)any trough split around georgia sending a non tropical low pressure system up the us east coast, as these will be the key factors in the storms track.
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2277. putintang3 3:40 AM GMT on August 23, 2010    
Houma La here It is kicking outside tonight
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2278. errantlythought 3:40 AM GMT on August 23, 2010    
Quoting txsweetpea:

It is NOT impossible for this to go further west ...I agree with you and there have been alot of storm tracks that have. I do realize that it all depends all depends onthe strength of Danielle and the troughs /ridging. If the troughs/ridging dont move according to planned this could play an important role also.


There's nothing blocking it from continuing west, AFAIK. The poleward movement predicted is, as you said, because of troughs.

That doesn't mean that Danielle CANT go west, it simply means that the more probable outcome will be poleward.
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2279. AllStar17 3:41 AM GMT on August 23, 2010    
Nice blog, Kori.
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2280. truecajun 3:42 AM GMT on August 23, 2010    
Quoting LADobeLady:


The winds are ripping, more from this that we got from TD5 and XTD5


where are you? the howling finally stopped here. i'm in brusly (west baton rouge)
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2281. LADobeLady 3:42 AM GMT on August 23, 2010    
where are you? the howling finally stopped here. i'm in brusly (west baton rouge)


I'm in Houma, it's storming here.
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2282. ChrisDcat5Storm 3:43 AM GMT on August 23, 2010    
the stronger the storm the more west movement?
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2283. atmoaggie 3:43 AM GMT on August 23, 2010    
No great big changes here...

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2284. Chicklit 3:43 AM GMT on August 23, 2010    
Btw, Koritheman's done a really nice blog on Danielle tonight. Really, good night!
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2285. FLPandhandleJG 3:43 AM GMT on August 23, 2010    






Here's some images..
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2286. CyclonicVoyage 3:44 AM GMT on August 23, 2010    
Quoting truecajun:


where are you? the howling finally stopped here. i'm in brusly (west baton rouge)


Actually looks like 2 gust fronts developed.
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2287. LADobeLady 3:44 AM GMT on August 23, 2010    
Quoting atmoaggie:


Aggie I love it when you post that, it really shows how much (or little) the forecast track changes, thanks!
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2288. will45 3:44 AM GMT on August 23, 2010    
Quoting errantlythought:


There's nothing blocking it from continuing west, AFAIK. The poleward movement predicted is, as you said, because of troughs.

That doesn't mean that Danielle CANT go west, it simply means that the more probable outcome will be poleward.


when that anticyclone gets dead center over her the northwest will start
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2289. truecajun 3:44 AM GMT on August 23, 2010    
Quoting LADobeLady:
where are you? the howling finally stopped here. i'm in brusly (west baton rouge)


I'm in Houma, it's storming here.


ah. yes. here is the rain. that wind was unnerving. i didn't like it catching me by surprise like that.
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2290. HadesGodWyvern 3:45 AM GMT on August 23, 2010    
Japan Meteorological Agency
Tropical Cyclone Advisory #8
TROPICAL STORM MINDULLE (T1005)
12:00 PM JST August 23 2010
===============================

SUBJECT: Category One Typhoon In South China Sea

At 3:00 AM UTC, Tropical Storm Mindulle (994 hPa) located at 16.1N 110.5E has 10 minute sustained winds of 35 knots with gusts of 50 knots. The storm is reported as moving west at 12 knots

Dvorak Intensity:

Gale Force Winds
=================
150 NM from the center

Forecast and Intensity
=======================
24 HRS: 18.1N 107.1E - 45 knots (CAT 1/Tropical Storm)
45 HRS: 19.8N 105.4E - 45 knots (CAT 1/Tropical Storm)
69 HRS: 21.0N 103.0E - 30 knots (Tropical Depression)
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2291. PcolaDan 3:45 AM GMT on August 23, 2010    
Quoting truecajun:


LOL! sorry i didn't realize that i put BR. that was silly. Baton Rouge. i really haven't heard wind like this except during canes. it's really strange that the local channels aren't saying anything. there is no rain, just constant howling winds and a little thunder in the distant north.


Was quite easy to figure out Baton Rouge, considering your handle is "truecajun". DOH!

Not seeing any warnings nor watches for your area. Should be over pretty soon.
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2292. xcool 3:45 AM GMT on August 23, 2010    


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2293. JLPR2 3:46 AM GMT on August 23, 2010    
Quoting cirrocumulus:
It seems the center of Danielle may relocate to the southeast. It is still in the early stages.


I'm thinking more of the mid level circulation dragging the LLC under it.
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2294. Seastep 3:47 AM GMT on August 23, 2010    
Danielle is at ~14N/37W.

Check the nice outflow to the E of that.
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2295. truecajun 3:48 AM GMT on August 23, 2010    
Quoting PcolaDan:


Was quite easy to figure out Baton Rouge, considering your handle is "truecajun". DOH!

Not seeing any warnings nor watches for your area. Should be over pretty soon.


thanks.
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2296. PcolaDan 3:48 AM GMT on August 23, 2010    
Quoting atmoaggie:
No great big changes here...



Unless you live in Bermuda. Then that last one is huge. ;)
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2297. CyclonicVoyage 3:50 AM GMT on August 23, 2010    
Quoting truecajun:


ah. yes. here is the rain. that wind was unnerving. i didn't like it catching me by surprise like that.


Gust fronts can produce nasty straight line winds of CAT 2 strength. Dry line between the gust front and the storm complex is why you weren't seeing any rain.
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2298. xcool 3:50 AM GMT on August 23, 2010    
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2299. FLPandhandleJG 3:51 AM GMT on August 23, 2010    
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2300. crashingwaves 3:51 AM GMT on August 23, 2010    
Quoting smuldy:
I'll go against the crowd. This is speculation this far out especially given model continuity, but I still refuse to buy a trough that deep and strong in August. IF the storm ramps up by tomorrow it could very well use its outflow to STRENGTHEN the ridge to its north. Given that the models forecast nearly a northerly movement from where it is, AND that even the NHC concedes it will head WNW for the next 48 hours, I find it highly troubling to call the models reliable as yet. Should the storm defy expectations, continue to feel a weakness to its north in the ridge, and should the ridge of high pressure break apart allowing a giant august nor'easter to form allowing a trough of low pressure to dip to 20n then the models will verify. At this time I have about 25% confidence of that happening. Where it goes will depend entirely on which components pan out and which do not, but until it recurves, or until the ridge weakens or splits, or until the large trough dips down at such an enormous strength, this needs to be watched by just about everyone on the Atlantic coastline or in Bermuda. Tropical cyclones are very difficult to predict, but given the number of extremely unusual components factored into the model forecast runs and given the current conditions showing little sign that these anomalies are shaping up save for computer runs, I feel this may well be the storm that models have the toughest time getting a handle on for this entire season in so far as track. Everyone should pay attention closely over the next few days to a)strength of the cyclone and its outflow b)latitude c) the mid atlantic ridge and d)any trough split around georgia sending a non tropical low pressure system up the us east coast, as these will be the key factors in the storms track.




I totaly agree here. Believe me, I will definetly watch this storm and every other storm that forms in the Atlantic. I think we get use to the models and forget the fact that theres a lot to play here. Time has to be right, in order for the troughs to steer Danielle out to sea. What if Danielle slows down or stalls. What if Danielle changes track. A lot of People are going to be in danger. Seeing that Danielle if forecasted to strengthen with time.jmo.
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2301. duajones78413 3:51 AM GMT on August 23, 2010    
Quoting ho77yw00d:
goodnight everyone cant wait until morning to see Danielle lol :) nite


Why?
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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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