Dr. Jeff Masters' WunderBlog

A late look at Invest93L
Posted by: Dr. Jeff Masters, 6:52 AM GMT en Junio 27, 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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1201. gordydunnot 8:29 PM GMT en Junio 27, 2009    
That was good Ike. Even though you ignore mine.
Member Since: Agosto 18, 2008 Posts: 0 Comments: 3044
1202. homegirl 8:30 PM GMT en Junio 27, 2009    
I'd put the center a bit more to the SE of Cozumel at this point.

Looking at the RGB loop on the floater, the last few frames are looking interesting...Link
Member Since: Agosto 1, 2006 Posts: 45 Comments: 7425
1203. IKE 8:30 PM GMT en Junio 27, 2009    
Quoting gordydunnot:
That was good Ike. Even though you ignore mine.


???
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1204. eddye 8:30 PM GMT en Junio 27, 2009    
it will hit west palm beach lol
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1205. kingzfan104 8:31 PM GMT en Junio 27, 2009    
1207. Chicklit 8:32 PM GMT en Junio 27, 2009    
Quoting Tatyana:
Does the fact that this system, for the past two days, has basically defied d-max/min mean anything? As weak as many people have said it to be, you'd think that it would be more tied to diurnal cycles.

It's the Ying Yang effect.
Member Since: Julio 11, 2006 Posts: 14 Comments: 10254
1208. kingzfan104 8:33 PM GMT en Junio 27, 2009    
1209. cchsweatherman 8:34 PM GMT en Junio 27, 2009    
Quoting Funkadelic:
Hey CCHSweatherman, does this look like a possible wilma track? (much weaker of course)


To be honest with you, its too soon to tell. It will all depend upon whether or not this disturbance can finally get its act together and its condition when it gets out into the GOM.
Member Since: Abril 14, 2007 Posts: 8 Comments: 4926
1210. SLU 8:35 PM GMT en Junio 27, 2009    
Quoting extreme236:


By that stage of development, it would likely develop very soon. The point of the graphic is to give an early warning of potential development, not to state the obvious.



Yeh that makes sence ... but what you find is that every year many systems pop up and threaten to develop for a few days with good model support but they never strengthen. So you don't want to go around forecasting development for every cluster of thunderstorms you see. You may get over 30 invests every year but only half make it to tropical storm strength. That's why its good to wait for until you see a little more organisation before forecasting tropical storm formation.

That's why i'm not too fussy about the Cape Verde waves right now. It's only June 27th not August 27th. Nor is this a 2008-like season when we had Bertha in early July.
Member Since: Julio 13, 2006 Posts: 11 Comments: 2851
1211. tennisgirl08 8:35 PM GMT en Junio 27, 2009    
Please let me clarify - I am not trying to stir up any trouble. Just an opinion and I did note that the NHC is the true source.

Its a wait and see game, and it can be interesting to see if any of our predictions come true. Remember Orcas game at the beginning of the hurricane season - date of first named storm??

Member Since: Julio 17, 2008 Posts: 0 Comments: 1242
1212. BrandiQ 8:35 PM GMT en Junio 27, 2009    
Quoting kingzfan104:


if it does im betting phil ferro says the phrase "south florida will see the dirty side of the storm" at least 100 times


LOL. I love Phil but he does repeat himself way too much.

I sure hope it doesn't take the Wilma track.
Member Since: Mayo 25, 2009 Posts: 0 Comments: 155
1213. centex 8:36 PM GMT en Junio 27, 2009    
If this system is true to form, the convection to N will eject and disapate by morning along with the S convection. What is left will look like just like it did this morning. The question is whether it will survive the land crossing tonight and start acting like a normal developing wave.
Member Since: Agosto 10, 2007 Posts: 0 Comments: 2856
1214. cchsweatherman 8:37 PM GMT en Junio 27, 2009    
Quoting homegirl:
I'd put the center a bit more to the SE of Cozumel at this point.

Looking at the RGB loop on the floater, the last few frames are looking interesting...Link


In watching the latest satellite images, I'm finally starting to see some improved organization as it appears a low-level circulation maybe becoming better defined offshore between the two convective masses. Will try and get some coordinates where I see the center in a few.
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1215. Patrap 8:37 PM GMT en Junio 27, 2009    


Gustav,..last August
Member Since: Julio 3, 2005 Posts: 372 Comments: 111607
1216. presslord 8:38 PM GMT en Junio 27, 2009    
the circulation of 93 is nothin compared to the spinning in my head after reading all of y'all...

Will someone please call me if I need to shutter up?
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1217. WPBHurricane05 8:38 PM GMT en Junio 27, 2009    
From accuweather.com:

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1218. gordydunnot 8:38 PM GMT en Junio 27, 2009    
Ike I was wrong on both counts you read my post and upon reading yours again I misunderstood it.
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1219. IKE 8:39 PM GMT en Junio 27, 2009    
Quoting gordydunnot:
Ike I was wrong on both counts you read my post and upon reading yours again I misunderstood it.


:)
Member Since: Junio 9, 2005 Posts: 23 Comments: 37044
1220. RadarRich 8:40 PM GMT en Junio 27, 2009    
Hello folks, 2009 here and let the games begin. Our first invest, and just that. Beginning stages... Once it establishes some explicit area/level of a definitive llC maybe in the near future, as in the next day or say, it is a guessing game. Patience is a virtue, keep patient and let the storm take its course, when at that point something with definitive data can be established, IE, into the GOM, THEN theforcsting/predictions, where, when, and strength has much more validity to give credence to. But this place is great all said and done
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1221. RainyEyes 8:40 PM GMT en Junio 27, 2009    
accuweather isn't accurate with anything much less weather
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1222. Patrap 8:40 PM GMT en Junio 27, 2009    
Member Since: Julio 3, 2005 Posts: 372 Comments: 111607
1223. Fshhead 8:42 PM GMT en Junio 27, 2009    
Afternoon Everyone!
Spirited debate on here as usual. lol
The launch coverage of the new GOES-O satellite is starting on NASA T.V.

T- 1 1/2 hour from now. Storms approaching from the west..

NASA T.V.
Member Since: Noviembre 19, 2005 Posts: 9 Comments: 9960
1224. WPBHurricane05 8:41 PM GMT en Junio 27, 2009    
Quoting RainyEyes:
accuweather isn't accurate with anything much less weather


Yea...just for kicks and giggles.
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1225. Patrap 8:41 PM GMT en Junio 27, 2009    
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1227. CCstormer 8:42 PM GMT en Junio 27, 2009    
12-16 hours until it emerges from Yuc, does this sound about right to the masses

Would help if there was concensus on coordinates
Member Since: Julio 21, 2008 Posts: 0 Comments: 46
1228. cchsweatherman 8:42 PM GMT en Junio 27, 2009    
Quoting cchsweatherman:


In watching the latest satellite images, I'm finally starting to see some improved organization as it appears a low-level circulation maybe becoming better defined offshore between the two convective masses. Will try and get some coordinates where I see the center in a few.


Right now, I'm tracking the center at around 20.0N and 86.1W moving towards the NNW (estimated 345 degrees). Keep in mind this is just based upon my observations.
Member Since: Abril 14, 2007 Posts: 8 Comments: 4926
1229. IKE 8:43 PM GMT en Junio 27, 2009    
Quoting Funkadelic:
Heres the latest from Hurricanecity.com,

Invest 93L:

Lat: 19.9N, 87.3W

Winds: 25 kts

Pressure: 1008mb

Do you guys think this is reliable info?



Looks pretty accurate.
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1230. Patrap 8:43 PM GMT en Junio 27, 2009    
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1231. TampaFLUSA 8:44 PM GMT en Junio 27, 2009    
Quoting Patrap:


..and we Gots da "Funktop" Color Infrared Loop

Looks SE of Cozumel to me...
Member Since: Junio 21, 2007 Posts: 10 Comments: 1656
1232. gordydunnot 8:44 PM GMT en Junio 27, 2009    
Presslord you are the master of understatement.
Member Since: Agosto 18, 2008 Posts: 0 Comments: 3044
1233. CybrTeddy 8:44 PM GMT en Junio 27, 2009    
An example of why you should have patience.

If I were to go back in time on this blog (well, I was on it last year lol) and tell them that this would hit near Brownsville Texas as a Category 2 Hurricane and cause a Billion dollars in damaages becoming the 4th most destructive Hurricane to ever hit Texas (3rd at the time, till Ike became the first) I would have been banned and called a wishcaster. You never know what's going to slam you in the face.
Member Since: Julio 8, 2005 Posts: 253 Comments: 20263
1234. Patrap 8:44 PM GMT en Junio 27, 2009    
Member Since: Julio 3, 2005 Posts: 372 Comments: 111607
1235. canesrule1 8:44 PM GMT en Junio 27, 2009    
trust me everyone this low with our invest is already over land it was over playa del carmen about 30-60 minutes ago. if you want proof consult with kman.
1236. WPBHurricane05 8:45 PM GMT en Junio 27, 2009    
Quoting Funkadelic:
Heres the latest from Hurricanecity.com,

Invest 93L:

Lat: 19.9N, 87.3W

Winds: 25 kts

Pressure: 1008mb

Do you guys think this is reliable info?



They...like this site...get their data from here. So yes...it is accurate.
Member Since: Julio 31, 2006 Posts: 56 Comments: 7929
1237. Stormchaser2007 8:45 PM GMT en Junio 27, 2009    
Member Since: Junio 9, 2007 Posts: 4 Comments: 15248
1238. Dar9895 8:45 PM GMT en Junio 27, 2009    
Quoting Patrap:


Gustav,..last August


It is not Gustav it's Fay.
1239. homegirl 8:45 PM GMT en Junio 27, 2009    
I agree cchs, with each new frame it appears we are seeing a LLC developing. Will it hold as it crosses teh Yucatan? Don't know...but that's where I see it and I see it becoming a bit more organized. Then again...I'm an amature. :)
Member Since: Agosto 1, 2006 Posts: 45 Comments: 7425
1240. Drakoen 8:46 PM GMT en Junio 27, 2009    
I have the center at 20.2N 87.4W.
Member Since: Octubre 28, 2006 Posts: 57 Comments: 29010
1241. Patrap 8:46 PM GMT en Junio 27, 2009    
Well..then youll have to excuse me,I just got up from a Nap. Glasses are Upstairs..LOL

But props to that 50 year old memory Bank eh?
I remembered that Dvorak Look

LOL
Member Since: Julio 3, 2005 Posts: 372 Comments: 111607
1242. WPBHurricane05 8:47 PM GMT en Junio 27, 2009    
Of course, at this point there is no actual surface low so the "center" is just a guess.
Member Since: Julio 31, 2006 Posts: 56 Comments: 7929
1243. homegirl 8:48 PM GMT en Junio 27, 2009    
stormchaser2007, could you post the latest infrared from that site also! I was just looking at it, but I have never firgured out how to post a pic from that site...I alwasy get that block post script message. Thx
Member Since: Agosto 1, 2006 Posts: 45 Comments: 7425
1244. RainyEyes 8:48 PM GMT en Junio 27, 2009    
Where is StormW at? Is he still around??
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1245. centex 8:48 PM GMT en Junio 27, 2009    
Quoting IKE:


Looks pretty accurate.

Yea, but that seems to be current thinking. They just forget to mention it's only about 15% reliability give or take 1000 miles.
Member Since: Agosto 10, 2007 Posts: 0 Comments: 2856
1246. IpswichWeatherCenter 8:48 PM GMT en Junio 27, 2009    
Quoting Acemmett90:

GOOD Flow with this ANA thingy lol


It does look like a pair of lungs.. or a pair of conjoined twins.

However I have a feeling the most eastily "lung" may split off and have a crack with developing.
Member Since: Abril 27, 2008 Posts: 29 Comments: 2097
1247. gordydunnot 8:48 PM GMT en Junio 27, 2009    
Thats what I saw last night only warning is the system loves to generate mlc. We need a quick sat. or something to be sure.
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1248. CybrTeddy 8:48 PM GMT en Junio 27, 2009    
I can't find a good picture of 94L (Pre-Dolly 2008) but my point remains.
Member Since: Julio 8, 2005 Posts: 253 Comments: 20263
1249. Patrap 8:49 PM GMT en Junio 27, 2009    
Member Since: Julio 3, 2005 Posts: 372 Comments: 111607
1250. canesrule1 8:49 PM GMT en Junio 27, 2009    
Quoting Funkadelic:
Heres the latest from Hurricanecity.com,

Invest 93L:

Lat: 19.9N, 87.3W

Winds: 25 kts

Pressure: 1008mb

Do you guys think this is reliable info?

close but it is on 20.53 and 87.02 as me and kman concurred.
1251. Patrap 8:51 PM GMT en Junio 27, 2009    
What your seeing is whats called,Bi-lobing.
2 distinct Convective Burst around the mean center. 93L may find her balance tonight as she emerges into the GOM proper.
Member Since: Julio 3, 2005 Posts: 372 Comments: 111607

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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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