Dr. Jeff Masters' WunderBlog

Tropical Storm Don forms in the Gulf of Mexico
Posted by: Dr. Jeff Masters, 21:29 GMT le 27 juillet 2011 +8
Tropical Storm Don, the fourth tropical cyclone of the 2011 season, has formed in the Gulf of Mexico just north of the Yucatan Peninsula. Hurricane Hunters began investigating the system earlier this afternoon and quickly found a closed surface circulation. As the mission continued to gather data from what was thought to be a tropical depression at the time, winds of around 39 mph were found, as well as a 1001 mb central pressure, bringing the system up to tropical storm strength.


Figure 1. Satellite loop of Tropical Storm Don. This loop will stay current.

The official forecast for Don agrees with what most of the models have been suggesting over the past 24 hours. Don will make its way toward the northwest over the next 48 hours before making landfall somewhere between Brownsville and Galveston. The statistical models tend to suggest a more southerly track toward Brownsville, and the dynamical models are forecasting anything from Corpus Christi to Galveston. They all tend to agree landfall will occur late on the 29th (Friday night). Whether or not Don will reach hurricane status is still in question. The Hurricane Center's initial forecast is that Don will remain a tropical storm until landfall. Today some models were intensifying Don to a strong tropical storm, but none crossed the hurricane threshold. Now that we have data from aircraft reconnaissance, the models will be able to get a better handle on potential intensity. The runs that occur later tonight and early tomorrow will have much less uncertainty than those from today.


Figure 2. Model forecast tracks for Tropical Storm Don as of Wednesday afternoon.

I believe Jeff will be back tomorrow for an update.

Angela
Categories: Hurricane
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1701. ProgressivePulse 14:04 GMT le 28 juillet 2011    
Quoting Vincent4989:
POLL TIME!
Do you think Don's rains will be....
A. Beneficial to Texas
B. Harmful to Texas



C. All of the above
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1703. Orcasystems 14:04 GMT le 28 juillet 2011    
I can see one or two 1000.2 readings in that loop the loop he did.

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1704. RitaEvac 14:05 GMT le 28 juillet 2011    
Quoting Levi32:
The center of Don is only half-way covered by the current convective burst, but it has been enough to lower the pressure by 3mb in 1 hour 40 minutes.


That's pretty impressive
Member Since: 14 juillet 2008 Posts: 1 Comments: 8912
1705. ProgressivePulse 14:06 GMT le 28 juillet 2011    
These little shakes an wobbles add up over time. While not a big deal over the open ocean, they get increasingly important as you get closer to land.
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1706. barbamz 14:06 GMT le 28 juillet 2011    
Quoting Levi32:
Good morning.

Blog update:

Tropical Tidbit for Thursday, July 28th, with Video


Very good. Thanks again for spending your time on this service, Levi!
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1707. HimacaneBrees 14:08 GMT le 28 juillet 2011    
Quoting ProgressivePulse:
Don running with a starboard bias.





Would that be to the right? Yes it's right or is it left. Depends on if your facing forward or aft. I'm confused now. Just joking it's right. And I do agree with you.
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1708. CybrTeddy 14:08 GMT le 28 juillet 2011    
IMO 45 mph, 999 mb at 11 am.
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1709. RitaEvac 14:09 GMT le 28 juillet 2011    
50mph could be reasonable with that 999mb pressure reading
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1710. Neapolitan 14:09 GMT le 28 juillet 2011    
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1712. NICycloneChaser 14:11 GMT le 28 juillet 2011    
Quoting CybrTeddy:
IMO 45 mph, 999 mb at 11 am.


That would be my guess too.
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1714. xcool 14:12 GMT le 28 juillet 2011    
newwwwwwwwww blogggggggg
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1716. SPadreguy 14:28 GMT le 28 juillet 2011    
Looks like it's strengthening as it clears the Yucatan and heads for warmer water. Possibly getting a bit larger too.

Depending on how much the High to the north effects it I'd still guess a landfall somewhere between Port Mansfield and Aransas Pass as a strong TS, possibly a even a small hurricane.

I guess all that with nothing more than fifty years experience of watching Texas hurricanes. In the end Don will do what it does. I haven't done any more down here on the far south Laguna Madre than tie up my boat good.
This one is fairly small so it looks like there won't be much surge, and when you live on the Laguna Madre and your bottom floor is all of 1i or so feet above MSL that's your first concern.
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1717. MahFL 14:32 GMT le 28 juillet 2011    
Looks like a west track atm, to MX, no rain for TX....
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1718. hydrus 14:33 GMT le 28 juillet 2011    
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1719. Vincent4989 14:33 GMT le 28 juillet 2011    
NEW BLOOOOOOOOOOGGGG!!!!
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1720. HurricaneHunterJoe 14:35 GMT le 28 juillet 2011    
Quoting MrstormX:


I'd agree with that, he obviously had overnight troubles.
I Think dry air and land interaction were tough on him last night. he seems to be doing ok now
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1721. HurricaneHunterJoe 14:36 GMT le 28 juillet 2011    
Quoting OracleDeAtlantis:
Not only was the Yucatan impeding it, dry air, and shear, but upwelling.

Now he's free ...




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agreed, he had a bit of a rough go last night into this am, he's doing better now
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1722. HurricaneHunterJoe 14:39 GMT le 28 juillet 2011    
Quoting Jax82:
If Don does make landfall in Corpus Christi he'll be going right smack in the middle of the Exceptional Drought areas of Texas, 75% of Texas is in the Exceptional Drought, 92% in Extreme.

I think Corpus is the best locaation for landfall to help the most with their rainfall issues.
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1723. HurricaneHunterJoe 14:48 GMT le 28 juillet 2011    
Quoting MrstormX:


Not really, it is clearly them most organized we have seen this since we lost visible images last night.
agreed, def looks the best since he was named
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1724. HurricaneHunterJoe 14:50 GMT le 28 juillet 2011    
Quoting hydrus:
Don has a tail...
the don has coattails
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1725. HurricaneHunterJoe 14:56 GMT le 28 juillet 2011    
Quoting Levi32:
The center of Don is only half-way covered by the current convective burst, but it has been enough to lower the pressure by 3mb in 1 hour 40 minutes.


Levi, Why are the circulations not stacking? Is it that the steering currents at differnt levels of the atmosphere are slightly different? Or shear, which was light, and thought to be getting lighter?
Member Since: 18 septembre 2010 Posts: 0 Comments: 2690
1726. HurricaneHunterJoe 14:58 GMT le 28 juillet 2011    
Quoting ProgressivePulse:
These little shakes an wobbles add up over time. While not a big deal over the open ocean, they get increasingly important as you get closer to land.
just ask the people in Punta Gorda Florida
Member Since: 18 septembre 2010 Posts: 0 Comments: 2690

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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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