Dr. Jeff Masters' WunderBlog

A late look at Invest93L
Posted by: Dr. Jeff Masters, 06:52 GMT le 27 juin 2009 +1
Hi everybody, this is Rob Carver, R&D Scientist for Wunderground, filling in for Jeff Masters.

Summary of the situation

In the Tropical Weather Outlook NHC has tagged a tropical wave in the NW Caribbean Sea as Invest93L and believes that it has a 30-50% chance of developing into a tropical cyclone in the next 48 hours. As of now (11 PM PDT, June 26), the Hurricane Hunters are scheduled to investigate this area on June 28. The track models have Invest93L moving through the Yucatan Straits into the Gulf of Mexico. After that, most of the models take the cyclone north and east making landfall along a wide swath of Florida's Gulf Coast on Wednesday of next week. The intensity models predict that at landfall, the system will be a weak Category 1 hurricane or strong tropical storm.


Figure 1. Plot of upper-level wind shear from CIMSS

Wind Shear Aloft

The wind shear patterns are favorable for intensification of Invest93L if it can make it through the Yucatan Straits. Figure 1 shows that currently, Invest93L is an unfavorable environment, with shear > 20 knots. However, north of the Yucatan Straits and SW of Florida, the shear drops to a favorable 5 knots. Both the GFS and NAM predict that that this shear pattern will be fairly constant over the next several days. Also, the water temperatures in the Gulf of Mexico are either normal or slightly above normal, so that will be favorable for storm development.

What happens next?
If Invest93L can survive long enough to get in the Gulf of Mexico, then I believe it can develop into TS Ana, the first named storm of the year. However, survival is not guaranteed, the convection around Invest93L is not that persistent. That said, people with interests along the coast of the Gulf of Mexico should keep an eye on this storm this weekend and into the early part of the next week.

Rob Carver
Categories: Hurricane
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1601. canesrule1 22:41 GMT le 27 juin 2009    
1602. Vortex1094 22:41 GMT le 27 juin 2009    
Quoting WPBHurricane05:
Would be nice to see Levi, 456, StormW, Drak, and a few others soon....
speaking of Levi check out his blog for his video forecast of this storm it's well worth the 6 minutes
1603. FMDawg 22:41 GMT le 27 juin 2009    
Quoting CycloneOz:
Here's a theoretical what-if:

What if you lived west of Texas...and
What if you liked to hunt hurricanes...and
What if you had a feeling 93L would become a Cat 1 hurricane...and
What if you had a weeks vacation...and
What if you had friends in Pensacola & Tampa...

Question...

Would you leave right now or wait?


Yes!
Member Since: 25 juillet 2008 Posts: 0 Comments: 95
1604. bappit 22:42 GMT le 27 juin 2009    
Looked at the visible loop and there is a lot of shear. Neat to watch one thunderstorm with pretty intense convection and clouds being blown on either side around the convection. That convection probably will back build under the diffluence it is creating. That will give the appearance that the thunderstorms are not moving that fast--but they are. Just reforming on the upwind side of the convection.

With all the shear, the big clouds are all to the north of whatever center this thing has. I saw a little swirl of low level clouds (first time with this thing!) off the coast of Belize. The clouds evaporated but I suspect the swirl if any is in that vicinity.

Shear rules!
Member Since: 18 mai 2006 Posts: 3 Comments: 4372
1605. CosmicEvents 22:42 GMT le 27 juin 2009    
Quoting StSimonsIslandGAGuy:
Most of the USA east of the Rockies is in a low pressure environment.


That's a very astute macro thought.
Not sure if it means anything about the future of blobo#2, but I like it.
Member Since: 3 août 2005 Posts: 10 Comments: 5099
1607. FloridaTigers 22:42 GMT le 27 juin 2009    
what time will it launch?
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1608. HaboobsRsweet 22:43 GMT le 27 juin 2009    
I got a feeling 93L wont become TD2 until the hurricane hunters take a peak at it. You may even see a jump from invest status to TS depending on when they finish taking a look at all the data.
Member Since: 20 mai 2009 Posts: 0 Comments: 1640
1609. BenBIogger 22:43 GMT le 27 juin 2009    
Quoting TampaSpin:


Based upon satellite. Very strong Convection and a Surface Low that will be in place by 11pm in my opinion. Its just above the surface now....look at the 850mb vorticity and divergence returns.


No west wind
Member Since: 19 Mars 2009 Posts: 0 Comments: 1419
1610. plywoodstatenative 22:44 GMT le 27 juin 2009    
Tigers, depends on when Nasa feels that there are no other storms nearby. Check Nasa's site for information, thats the best bet.
Member Since: 15 novembre 2005 Posts: 16 Comments: 4147
1611. TampaSpin 22:44 GMT le 27 juin 2009    
Quoting hurricane2009:


850mb and divergence has been in favor of this thing about 3 or 4 times before in the last 2 days and it hasnt formed a surface low

I guess we will see, but even if it builds a surface low now the NHC wants a bit of persistence with this said low, so 11pm would likely be too early


Never had the deep convection before thats the difference before.........
Member Since: 2 septembre 2007 Posts: 175 Comments: 19747
1613. kmanislander 22:45 GMT le 27 juin 2009    
My estimated position for the area of lowest pressure is 21N 87.6W still moving NW.

It will be a few hours before it reemerges over water.
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1614. stormpetrol 22:45 GMT le 27 juin 2009    
Getting very close to TD Status IMO.
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1618. Chicklit 22:46 GMT le 27 juin 2009    
Waiting for Code Red.
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1619. plywoodstatenative 22:46 GMT le 27 juin 2009    
Tampa, with the movement to ENE or NE, whats the track then.

As I said before, the storm split in half to avoid land mass and shear from the ULL. Thats classic from last year.
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1620. Patrap 22:47 GMT le 27 juin 2009    
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1621. TampaSpin 22:46 GMT le 27 juin 2009    
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1624. HaboobsRsweet 22:47 GMT le 27 juin 2009    
Def thinking code red tonight and TD tomorrow.
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1625. WPBHurricane05 22:47 GMT le 27 juin 2009    
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1628. kmanislander 22:47 GMT le 27 juin 2009    
Quoting hurricane2009:


21N 87.6W?


Yes, a typo. Corrected it.
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1629. FMDawg 22:48 GMT le 27 juin 2009    
Quoting FloridaTigers:
what time will it launch?


T minus one minute
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1630. plywoodstatenative 22:48 GMT le 27 juin 2009    
Tampa, english please.
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1631. wunderkidcayman 22:48 GMT le 27 juin 2009    
here in cayman pressu 1010mb and falling a mb per hour
Member Since: 13 juin 2009 Posts: 2 Comments: 5416
1632. TampaSpin 22:49 GMT le 27 juin 2009    
Quoting plywoodstatenative:
Tampa, with the movement to ENE or NE, whats the track then.

As I said before, the storm split in half to avoid land mass and shear from the ULL. Thats classic from last year.


The upper level low is booking out.....LOOK
Member Since: 2 septembre 2007 Posts: 175 Comments: 19747
1633. Tazmanian 22:49 GMT le 27 juin 2009    
June 2009 Is Now The 2nd Wettest Denver June

June 2009 has moved into the second wettest June since Denver weather records began in 1872. So far for June 2009...through June 26th...the Denver International Airport (DIA) has measured 4.86 inches of liquid (and there are still 4 more days left in June). The 4.86 inches of water is 3.52 inches above normal through the 26th. Last year...June 2008 had only measured 0.73 inch again through the same June time frame.

The wettest June on record for Denver was in June 1882 when 4.96 inches of moisture was collected in the rain bucket.

For the 2009 year so far, 10.38 inches of water has been measured at DIA which is a very impressive 2.51 inches above the normal through June 26th. Last year in June, only 3.04 inches had been recorded through the same time frame.

Note: The average Denver annual precipitation is 15.81 inches
Member Since: 21 mai 2006 Posts: 5088 Comments: 111346
1634. Patrap 22:49 GMT le 27 juin 2009    
IR Loop


WV loop
Member Since: 3 juillet 2005 Posts: 371 Comments: 111403
1637. WPBHurricane05 22:50 GMT le 27 juin 2009    
Quoting WPBHurricane05:
Upper divergence is up to 50.

Lower convergence at 15.

850mb Vorticity continues to get stronger.

Wind shear continues to drop.


Alright those links dont work. :(

Maybe this will.
Member Since: 31 juillet 2006 Posts: 56 Comments: 7921
1639. canesrule1 22:51 GMT le 27 juin 2009    
i think our low is east of Benito Suarez, Mexico.
1640. StormFreakyisher 22:52 GMT le 27 juin 2009    
If it stays at code orange, would give a reason why please?
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1641. plywoodstatenative 22:52 GMT le 27 juin 2009    
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1642. kingzfan104 22:52 GMT le 27 juin 2009    
1643. kmanislander 22:53 GMT le 27 juin 2009    
Quoting wunderkidcayman:
here in cayman pressu 1010mb and falling a mb per hour


Pressure here is 1012.3 and steady
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1644. FloridaTigers 22:53 GMT le 27 juin 2009    
So how drastic of a turn is feasible? Anything from big bend to Ft. Myers?
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1645. TampaSpin 22:53 GMT le 27 juin 2009    
Quoting plywoodstatenative:
Tampa, english please.


Right now im not sure the High is going to break down as fast as models are saying...will have a better idea tomorrow late.....but my best guess would be toward Texas/Louisiana
Member Since: 2 septembre 2007 Posts: 175 Comments: 19747
1646. canesrule1 22:54 GMT le 27 juin 2009    
Quoting Acemmett90:
LAstest sat still looks bad for floridians
yea, i think its going to make landfall like fay did in 08' in my opinion if it keeps going NE as we are seeing.
1647. FloridaTigers 22:54 GMT le 27 juin 2009    
Quoting kingzfan104:
can someone tell me the sign that would make this thing make a more southern landfall, like in s florida if this thing develops? thanks you so much in advance


Too early for an exact turn, but if it develops, the whole west coast of Florida should pay attention.
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1649. plywoodstatenative 22:54 GMT le 27 juin 2009    
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1650. crosbyweatherfan 22:54 GMT le 27 juin 2009    
Does anyone know if the Hurricane hunters are scheduled into this anytime soon?
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1651. KEEPEROFTHEGATE (Mod) 22:55 GMT le 27 juin 2009    
MARINE WEATHER DISCUSSION

GULF OF MEXICO...AN E TO W RIDGE EXTENDING FROM SW FL TO THE TX
COAST WILL SPLIT LATE TONIGHT AS THE NORTHERN EXTENSION OF A
TROPICAL WAVE SEPARATES FROM ITS PARENT WAVE. THE TROUGH WILL
DRIFT N THROUGH THE YUCATAN CHANNEL AND S CENTRAL GULF WATERS
TONIGHT AND LIE UNDER THE FAVORABLE DIFFLUENCE E OF AN UPPER
TROUGH AND CUT OFF CYCLONE OVER THE BAY OF CAMPECHE. BASICALLY
EXPECTING THE TROUGH TO BEGIN DRIFTING E SUN AND SUN NIGHT WITH
A LOW PRES DEVELOPING ALONG THE TROUGH. THE LOW HAS THE
POSSIBILITY OF STRENGTHENING TO A TROPICAL CYCLONE. PLENTY OF
UNCERTAINTY IN THE DEVELOPMENT...STRENGTH AND TRACK OF THIS LOW
AND LATEST GUIDANCE MUCH LESS AGGRESSIVE SO TONED DOWN THIS
MORNINGS TEXT PACKAGE AND TONING DOWN GRAPHICAL PACKAGE IN
PROGRESS.

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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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