Dr. Jeff Masters' WunderBlog

A late look at Invest93L
Posted by: Dr. Jeff Masters, 06:52 AM GMT am 27. Juni 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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401. SomeRandomTexan 03:13 PM GMT am 27. Juni 2009    
plywood---

its the MLC
Member Since: August 30, 2007 Posts: 0 Comments: 1814
402. TampaFLUSA 03:13 PM GMT am 27. Juni 2009    
Quoting KEEPEROFTHEGATE:
AOI/INV/93L
MARK
19.8N/84.7W

Looks like its on life support.
Member Since: Juni 21, 2007 Posts: 10 Comments: 1656
403. IKE 03:14 PM GMT am 27. Juni 2009    
What time does recon update schedule? 10:30 CDST?
Member Since: Juni 9, 2005 Posts: 23 Comments: 37044
404. IKE 03:15 PM GMT am 27. Juni 2009    
Quoting TampaFLUSA:

Looks like its on life support.


I said that earlier. Looks better now.
Member Since: Juni 9, 2005 Posts: 23 Comments: 37044
405. plywoodstatenative 03:15 PM GMT am 27. Juni 2009    
if that mess passes over the part of cuba without mountains and hits the gulfstream waters.....
Member Since: November 15, 2005 Posts: 16 Comments: 4147
406. futuremet 03:15 PM GMT am 27. Juni 2009    
Nice new model/Satellite image site I just found. It is filled with data.

I recommend that you guys bookmark it.
Member Since: Juli 19, 2008 Posts: 43 Comments: 4049
407. KEEPEROFTHEGATE (Mod) 03:16 PM GMT am 27. Juni 2009    
Quoting Weather456:
The next round of convective burst maybe is what will take the feature off.
convective burst should commence around 2 pm right after NHC update and the start of the daytime heat maximum from 2 till 4
Member Since: Juli 15, 2006 Posts: 143 Comments: 40493
408. Ossqss 03:16 PM GMT am 27. Juni 2009    
Is that some banding taking place over Cuba?
Member Since: Juni 12, 2005 Posts: 6 Comments: 8154
409. reedzone 03:16 PM GMT am 27. Juni 2009    
Quoting TampaFLUSA:

Looks like its on life support.


not even close, there is nothing hindering it from developing, shear is low, temps are high, TCHP is good, maybe some land interaction but other then that, once it gets a closed low, it will most likely take off with the favorable conditions it is in.
Member Since: Juli 1, 2008 Posts: 13 Comments: 7247
410. plywoodstatenative 03:16 PM GMT am 27. Juni 2009    
Tampa, whats your base on track of both sets?
Member Since: November 15, 2005 Posts: 16 Comments: 4147
412. robbieNDBC 03:17 PM GMT am 27. Juni 2009    
Quoting atmoaggie:


Could that steep, and temporary, drop in pressure just have been a result of a good, hard, cold rain cooling the air?


Yes, because it dropped the three millibars in an hour's time and then rebounded up two millibars in just another hour. And if it was something like a low pressure center passing over it, I think you would expect a bigger shift in wind direction, which didn't really happen.

Quoting atmoaggie:



G'Morning. BTW, I work in Bldg. 1103 at SSC. You guys get a new hire for Steve Collins position yet? I used to have that dude on speed dial. Good guy.


Haha well I'm actually the wrong guy to ask. I'm just a student-intern at the time. This is my second stint as an intern at the NDBC and I can't say I remember him from my previous time. I'm a student at LSU also. I could ask around though on Monday!
413. HurricaneKing 03:18 PM GMT am 27. Juni 2009    
Link


The mid level center has finally organized itself enough I can make it out around 20.2n 83.9w moving nnw.

Also on the loop is a weird I'd guess land breeze induced surface swirl around 17n 88w. It's slowly drifting east.
Member Since: Juli 6, 2005 Posts: 71 Comments: 2430
414. plywoodstatenative 03:18 PM GMT am 27. Juni 2009    
futuremet, do me one favor. Next time you tell us to bookmark something. Have a look at the last time it was updated.
Member Since: November 15, 2005 Posts: 16 Comments: 4147
415. SomeRandomTexan 03:19 PM GMT am 27. Juni 2009    
The feature near cuba is the MLC which is soaking up a lot of the energy... its not a surface low...
Member Since: August 30, 2007 Posts: 0 Comments: 1814
416. IKE 03:20 PM GMT am 27. Juni 2009    
Quoting SomeRandomTexan:
The feature near cuba is the MLC which is soaking up a lot of the energy... its not a surface low...


Yeah I see it moving on.
Member Since: Juni 9, 2005 Posts: 23 Comments: 37044
417. Drakoen 03:20 PM GMT am 27. Juni 2009    
That site that Futuremet gave is updated lol.
Member Since: Oktober 28, 2006 Posts: 57 Comments: 29010
418. futuremet 03:21 PM GMT am 27. Juni 2009    
Quoting plywoodstatenative:
futuremet, do me one favor. Next time you tell us to bookmark something. Have a look at the last time it was updated.


Some are old and some are new. You should be able to differentiate. This is not only for tropical weather, but all types: severe, winter, tropical, etc.
Member Since: Juli 19, 2008 Posts: 43 Comments: 4049
419. plywoodstatenative 03:21 PM GMT am 27. Juni 2009    
high burst of convection off the coast of the Yucatan, my issue is that everyone is watching what is left of the system south of Cuba. While the rest of it is getting nicely set up, this could be a "sleeper storm"
Member Since: November 15, 2005 Posts: 16 Comments: 4147
420. fldr11 03:22 PM GMT am 27. Juni 2009    
prolly wont amount to a strong hurricane squalls and gusty winds. us here in louisiana could use the rain anyways;but never the less it reminds us who live along the gulf of mexico like i do to be alert and keep an eye out if sumtin gets in gulf huh?
421. KEEPEROFTHEGATE (Mod) 03:22 PM GMT am 27. Juni 2009    
Quoting WeatherStudent:
I'm telling y'all, look east, that's the place to look at. Clearly 93L is beyond RIP already.
only thing beyond is you beyond help
Member Since: Juli 15, 2006 Posts: 143 Comments: 40493
422. IKE 03:22 PM GMT am 27. Juni 2009    
Cozumel pressure went from 29.90 to 29.93.....it was at 29.86 earlier.

Cozumel, MX (Airport)
Updated: 29 min 12 sec ago
Mostly Cloudy
75 °F
Mostly Cloudy
Humidity: 94%
Dew Point: 73 °F
Wind: 5 mph from the ESE
Pressure: 29.93 in (Rising)
Visibility: 7.0 miles
UV: 5 out of 16
Clouds:
Scattered Clouds 1500 ft
Mostly Cloudy 8000 ft
Mostly Cloudy 20000 ft
(Above Ground Level)
Elevation: 16 ft
Member Since: Juni 9, 2005 Posts: 23 Comments: 37044
423. IKE 03:22 PM GMT am 27. Juni 2009    
Quoting KEEPEROFTHEGATE:
only thing beyond is you beyond help


LMAO!
Member Since: Juni 9, 2005 Posts: 23 Comments: 37044
424. washingaway 03:23 PM GMT am 27. Juni 2009    
Quoting plywoodstatenative:
futuremet, do me one favor. Next time you tell us to bookmark something. Have a look at the last time it was updated.


The site is current, I just checked some the links on it.
Member Since: Juli 14, 2006 Posts: 0 Comments: 1127
425. Ossqss 03:23 PM GMT am 27. Juni 2009    
It is banding. Quote -- from this earlier discussion.

Showers and thunderstorms associated with this disturbance have decreased somewhat over the past few hours, however, satellite imagery does show a feeder band with a curved appearance on the east side of the tropical wave axis. Curved bands like what we are seeing is a sign of organization because that means we are experiencing some low to mid level turning in the atmosphere which would force the convection to arc this way. So, even though convection has waned some overnight, this disturbance is organized and I suspect we will see another blowup of thunderstorm activity as the morning progresses.
Member Since: Juni 12, 2005 Posts: 6 Comments: 8154
426. plywoodstatenative 03:25 PM GMT am 27. Juni 2009    
Drak, have a look at the base of the page. Says last updated in dec. 08
Member Since: November 15, 2005 Posts: 16 Comments: 4147
427. futuremet 03:27 PM GMT am 27. Juni 2009    
Quoting plywoodstatenative:
Drak, have a look at the base of the page. Says last updated in dec. 08


These are the parameters and the composition of the site, not the models. However, it seems they are only updated at 00z and the 12z. There are also some archives there. This is nonetheless a great site for forecasting.

I think this is 00z GFS

Member Since: Juli 19, 2008 Posts: 43 Comments: 4049
428. SomeRandomTexan 03:28 PM GMT am 27. Juni 2009    
If we could get rid of the MLC thats taking energy away from the area off of Cozumel we could see the area really blow up.... imo.
Member Since: August 30, 2007 Posts: 0 Comments: 1814
429. IKE 03:29 PM GMT am 27. Juni 2009    
Headed toward 5 knots of shear....

Member Since: Juni 9, 2005 Posts: 23 Comments: 37044
430. Chicklit 03:29 PM GMT am 27. Juni 2009    
oh yeah, 93L is going to fizzle out just as it reaches lower shear and warm gulf waters...not to mention the gulf eddy. Where's Levi?
Member Since: Juli 11, 2006 Posts: 14 Comments: 10253
431. MrstormX 03:29 PM GMT am 27. Juni 2009    


^ Anyone know if this is a current model run.
Member Since: Mai 27, 2009 Posts: 0 Comments: 4232
432. nrtiwlnvragn 03:29 PM GMT am 27. Juni 2009    
Quoting IKE:
What time does recon update schedule? 10:30 CDST?


Normal Operations

5.5.1. DOC Requests for Aircraft Reconnaissance Data.

5.5.1.1. Coordination. The Tropical Prediction/National Hurricane Center (TPC/NHC) will coordinate with the Central Pacific Hurricane Center (CPHC) to determine a list of the total DOC requirements for data on tropical and subtropical cyclones or disturbances for the next 24-hour period (1100 to 1100 UTC) and an outlook for the succeeding 24-hour period. This coordinated request will be provided to CARCAH as soon as possible, but not later than 1630 UTC each day in the format of Figure 5-6. Amendments will be provided as required.
Member Since: September 23, 2005 Posts: 11 Comments: 8923
433. futuremet 03:30 PM GMT am 27. Juni 2009    
Quoting Chicklit:
Where's Levi?


He probably just woke up. It is early in Alaska.
Member Since: Juli 19, 2008 Posts: 43 Comments: 4049
434. Drakoen 03:30 PM GMT am 27. Juni 2009    
Probably won't see significant development until it goes through the Yucatan channel.
Member Since: Oktober 28, 2006 Posts: 57 Comments: 29010
435. HurricaneKing 03:30 PM GMT am 27. Juni 2009    
Quoting SomeRandomTexan:
If we could get rid of the MLC thats taking energy away from the area off of Cozumel we could see the area really blow up.... imo.


You do know that sometimes the mlc's win out and develop their own surface centers. I think that's actually porbably what will happen as the tropical wave moves into central America leaving the mlc to move into the gulf and develop.
Member Since: Juli 6, 2005 Posts: 71 Comments: 2430
436. kmanislander 03:31 PM GMT am 27. Juni 2009    
Quoting IKE:
KMAN I'm still watching that area.

Looks like you were right again.

I'm still ready to visit that paradise island!


Let me know when you're coming, I'll show you around.

All the discussion about where the " center " is reminded me of the 5 friends who went to Rome to see a famous cathedral.

As they stood in the middle of the big square, the first pointed to the East and said " well, there it is ". The second pointed to the South and said " no, it's over there ". The third friend pointed West and said " I am certain that is it over there " and the fourth pointed to the North and said " the three of you are wrong, I see it clearly there ".

At this point the four of them turned to the fifth and said " well, it's up to you now " to which he replied " I have no idea where it is but at least we have seen it ! ".

Time to run errands now. Have a great day all.
Back later.
Member Since: August 19, 2006 Posts: 0 Comments: 14939
437. IKE 03:31 PM GMT am 27. Juni 2009    
Quoting nrtiwlnvragn:


Normal Operations

5.5.1. DOC Requests for Aircraft Reconnaissance Data.

5.5.1.1. Coordination. The Tropical Prediction/National Hurricane Center (TPC/NHC) will coordinate with the Central Pacific Hurricane Center (CPHC) to determine a list of the total DOC requirements for data on tropical and subtropical cyclones or disturbances for the next 24-hour period (1100 to 1100 UTC) and an outlook for the succeeding 24-hour period. This coordinated request will be provided to CARCAH as soon as possible, but not later than 1630 UTC each day in the format of Figure 5-6. Amendments will be provided as required.


Thanks.....
Member Since: Juni 9, 2005 Posts: 23 Comments: 37044
438. washingaway 03:31 PM GMT am 27. Juni 2009    
Quoting MrstormX:


^ Anyone know if this is a current model run.


No, it's in the future.
Member Since: Juli 14, 2006 Posts: 0 Comments: 1127
439. IKE 03:32 PM GMT am 27. Juni 2009    
Quoting kmanislander:


Let me know when you're coming, I'll show you around.

All the discussion about where the " center " is reminded me of the 5 friends who went to Rome to see a famous cathedral.

As they stood in the middle of the big square, the first pointed to the East and said " well, there it is ". The second pointed to the South and said " no, it's over there ". The third friend pointed West and said " I am certain that is it over there " and the fourth pointed to the North and said " the three of you are wrong, I see it clearly there ".

At this point the four of them turned to the fifth and said " well, it's up to you now " to which he replied " I have no idea where it is but at least we have seen it ! ".

Time to run errands now. Have a great day all.
Back later.


I'd love to see that place.
Member Since: Juni 9, 2005 Posts: 23 Comments: 37044
440. hurricane23 03:32 PM GMT am 27. Juni 2009    
Quoting Drakoen:
Probably won't see significant development until it goes through the Yucatan channel.


Hey Drak,

I concur with your statements there on this disturbance, development (if any) will take place in the GOM.One thing look pretty certain florida looks rather wet next.

Still looks rather disorganized.
Member Since: Mai 14, 2006 Posts: 8 Comments: 13276
441. Chicklit 03:34 PM GMT am 27. Juni 2009    
Quoting Drakoen:
Probably won't see significant development until it goes through the Yucatan channel.

I agree Drakoen. It's kind of up against two land masses but they are small enough and there's enough water in between for the Invest to make it to the Gulf where it will strengthen. Back to furniture refinishing!
TTFN.
Member Since: Juli 11, 2006 Posts: 14 Comments: 10253
442. SomeRandomTexan 03:34 PM GMT am 27. Juni 2009    
Quoting HurricaneKing:


You do know that sometimes the mlc's win out and develop their own surface centers. I think that's actually porbably what will happen as the tropical wave moves into central America leaving the mlc to move into the gulf and develop.


that is true, we have seen that happen, and i am not saying that it won't happen this time. Im just pointing out what is the closest thing to the surface low.

Member Since: August 30, 2007 Posts: 0 Comments: 1814
443. Drakoen 03:35 PM GMT am 27. Juni 2009    
Morning Adrian,

Yes things are going to get soggy with the frontal boundary and low pressure system approaching. Trough should be able to pull up all that moisture.
Member Since: Oktober 28, 2006 Posts: 57 Comments: 29010
445. Patrap 03:38 PM GMT am 27. Juni 2009    
Member Since: Juli 3, 2005 Posts: 370 Comments: 111373
447. Patrap 03:39 PM GMT am 27. Juni 2009    
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448. Patrap 03:40 PM GMT am 27. Juni 2009    
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449. Drakoen 03:40 PM GMT am 27. Juni 2009    
1,000mph winds JFV. Better shutter up now and move to Canada.
Member Since: Oktober 28, 2006 Posts: 57 Comments: 29010
450. hahaguy 03:41 PM GMT am 27. Juni 2009    
Quoting Drakoen:
1,000mph winds JFV. Better shutter up now and move to Canada.


LMAO
Member Since: August 12, 2007 Posts: 2 Comments: 2838

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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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