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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902. PcolaDan 06:47 PM GMT am 27. Juni 2009    
Figured out what I was doing wrong.
West Cuba radar.

Member Since: August 22, 2008 Posts: 12 Comments: 6008
903. BahaHurican 06:47 PM GMT am 27. Juni 2009    
Quoting rainraingoaway:


Anybody?
Try the settings button at the top of the page.
Member Since: Oktober 25, 2005 Posts: 19 Comments: 17588
904. jeffs713 06:49 PM GMT am 27. Juni 2009    
Quoting rainraingoaway:


Anybody?

If I remembered how to do it myself... I would be happy to help. :)
Member Since: August 3, 2008 Posts: 15 Comments: 5722
906. WPBHurricane05 06:49 PM GMT am 27. Juni 2009    
Ya know...there is such a thing as Wunderground e-mail???
Member Since: Juli 31, 2006 Posts: 55 Comments: 7895
909. Levi32 06:49 PM GMT am 27. Juni 2009    
Drak what's your opinion on the upper pattern in the gulf? I'm leaning towards more poleward movement but the delicate pattern seems to favor a wide spread of possible tracks, all depending on the position of 93L and the depth of the east US trough.
Member Since: November 24, 2005 Posts: 586 Comments: 25441
910. Drakoen 06:50 PM GMT am 27. Juni 2009    
Quoting louisianaboy444:
I want Opinions from Drak and Levi on this one....What would it take for this storm to come up to Louisiana and give me some much needed rain....and is that possible at this stage based on current observations and models?


That is possible but not probable. The flow around the trough is still favorable for a tropical storm to get eject eastward. If it remains weak in the GOM it will likely follow the BAMM guidance. Keep in mind the BAMM guidance is not very dynamic are are heavily based on current conditions. They may not be able to pick up on a longwave trough coming down from the north favoring a ridge that is closer.
Member Since: Oktober 28, 2006 Posts: 57 Comments: 29010
911. atmoaggie 06:50 PM GMT am 27. Juni 2009    
Quoting PcolaDan:
Figured out what I was doing wrong.
West Cuba radar.



A link might be better for that one...they seem not to have the bandwidth for sharing the plot on the blog...sloooooooowww.
Member Since: August 16, 2007 Posts: 6 Comments: 12461
913. Cavin Rawlins 06:51 PM GMT am 27. Juni 2009    
Regardless of how many questions he asks, he is human and has feelings.
Member Since: Juli 24, 2005 Posts: 407 Comments: 19076
914. WPBHurricane05 06:51 PM GMT am 27. Juni 2009    
Quoting hurricaneseason2006:


Umm...who cares???
Member Since: Juli 31, 2006 Posts: 55 Comments: 7895
916. rainraingoaway 06:52 PM GMT am 27. Juni 2009    
Thanks Baja & Jeffs....."settings" is probably where its fixed but I cant find it or figure out how. Hmmpf.
Member Since: August 19, 2007 Posts: 3 Comments: 273
917. Levi32 06:52 PM GMT am 27. Juni 2009    
Quoting Drakoen:


That is possible but not probable. The flow around the trough is still favorable for a tropical storm to get eject eastward. If it remains weak in the GOM it will likely follow the BAMM guidance. Keep in mind the BAMM guidance is not very dynamic are are heavily based on current conditions. They may not be able to pick up on a longwave trough coming down from the north favoring a ridge that is closer.


That basically answers my question lol. I agree a non-classified system may get pulled west, but poleward movement seems the most likely to me.
Member Since: November 24, 2005 Posts: 586 Comments: 25441
918. PcolaDan 06:52 PM GMT am 27. Juni 2009    
Quoting atmoaggie:


A link might be better for that one...they seem not to have the bandwidth for sharing the plot on the blog...sloooooooowww.


spoil sport :)

think you're right, faster on mine from cache i think
will del
Member Since: August 22, 2008 Posts: 12 Comments: 6008
919. atmoaggie 06:53 PM GMT am 27. Juni 2009    
LA boy, I have trouble with the mid-level steering putting this into Louisiana...just not likely.

Once this system picks a direction in the next day or so, it will be one way or the other. Down the middle doesn't really seem possible, but stay tuned, of course.

Member Since: August 16, 2007 Posts: 6 Comments: 12461
920. louisianaboy444 06:53 PM GMT am 27. Juni 2009    
thanks guys and i'm sorry if i shorted anyone on the blog i know there is alot of smart people here i just respect their observations sorry if i offended anyone
Member Since: August 29, 2006 Posts: 17 Comments: 1218
921. rainraingoaway 06:53 PM GMT am 27. Juni 2009    
Quoting atmoaggie:


You have to upload it again and check the primary portrait box at the bottom (if I remember correctly).


Ok. I will try that now. Thanks.
Member Since: August 19, 2007 Posts: 3 Comments: 273
923. Drakoen 06:56 PM GMT am 27. Juni 2009    
Quoting Levi32:
Drak what's your opinion on the upper pattern in the gulf? I'm leaning towards more poleward movement but the delicate pattern seems to favor a wide spread of possible tracks.


On Sunday the system will no doubt be moving in a more poleward fashion as the low level steering indicates by the dynamic computer forecast models. Steering will be weak as the system gets wedge between the ridge in the west and the trough in the east probably have a system moving anywhere from drifting to 10knots at maximum. The longwave flow cuts in very aggressively on Monday with the GFS and CMC being the strongest with the trough. If it becomes a large enough tropical storm on Monday it's heading eastward. If not it could head westward.
Member Since: Oktober 28, 2006 Posts: 57 Comments: 29010
924. Cavin Rawlins 06:56 PM GMT am 27. Juni 2009    
Quoting hurricaneseason2006:
I often wonder, Drak is not a met but he spends this much time devoted to it that it bears the question, what does he really do with his life. If he is a hobbyist, it is really consuming his entire life. You could imagine his productivity at work, he's friends, etc. Gosh. His posts are so detail that it indicates someone who sits by a computer 24/7 analysing every angle?


I think he and others can find a balance.
Member Since: Juli 24, 2005 Posts: 407 Comments: 19076
925. sporteguy03 06:56 PM GMT am 27. Juni 2009    
Quoting louisianaboy444:
thanks guys and i'm sorry if i shorted anyone on the blog i know there is alot of smart people here i just respect their observations sorry if i offended anyone


You provide some great insight much appreciated.
Member Since: Juli 7, 2005 Posts: 0 Comments: 4824
927. Chicklit 06:57 PM GMT am 27. Juni 2009    
Quoting hurricane23:
18z view @ Statistical/Simple Models

18z view @ Dynamic Models

Assuming the center is that far west.
Member Since: Juli 11, 2006 Posts: 14 Comments: 10244
928. Levi32 06:57 PM GMT am 27. Juni 2009    
Quoting Drakoen:


On Sunday the system will no doubt be moving in a more poleward fashion as the low level steering indicates by the dynamic computer forecast models. Steering will be weak as the system gets wedge between the ridge in the west and the trough in the east probably have a system moving anywhere from drifting to 10knots at maximum. The longwave flow cuts in very aggressively on Monday with the GFS and CMC being the strongest with the trough. If it becomes a large enough tropical storm on Monday it's heading eastward. If not it could head westward.


I agree.
Member Since: November 24, 2005 Posts: 586 Comments: 25441
930. sporteguy03 06:58 PM GMT am 27. Juni 2009    
It is none of my business how people handle their personal life, there is no law or rule how long one can blog.
Member Since: Juli 7, 2005 Posts: 0 Comments: 4824
931. Levi32 06:58 PM GMT am 27. Juni 2009    
Quoting WeatherStudent:


is it a toss-up then, levi? at least for the present time being that is.


Pretty much still wait and see. Again the models don't do so well with ill-defined systems. What we really need is for this to get a closed circulation and declared a tropical depression so we can better gauge where it might go.
Member Since: November 24, 2005 Posts: 586 Comments: 25441
932. IKE 06:59 PM GMT am 27. Juni 2009    
Member Since: Juni 9, 2005 Posts: 23 Comments: 37044
933. louisianaboy444 07:00 PM GMT am 27. Juni 2009    
The two Clip models have it going into Louisiana but aren't those models based on climatology?
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934. Dar9895 07:00 PM GMT am 27. Juni 2009    
Hi everyone, it seems is getting some action in the African coast too.
935. Cavin Rawlins 07:00 PM GMT am 27. Juni 2009    
2 PM Update

2009062718, , BEST, 0, 199N, 873W, 25, 1008, DB, 34, NEQ,

Member Since: Juli 24, 2005 Posts: 407 Comments: 19076
936. Drakoen 07:01 PM GMT am 27. Juni 2009    
LOL. I don't sit at my computer all day. I leave my browser up on my computer and do other stuff when I need to and check back for updates. Also, it doesn't take me that long to look at things. Right now i'm doing some house cleaning lol!
Member Since: Oktober 28, 2006 Posts: 57 Comments: 29010
937. Chicklit 07:01 PM GMT am 27. Juni 2009    
No 2 p.m. Discussion.
By 8 maybe things will be more discernable.
If not, maybe 2 a.m. or then again 8 a.m. Sunday!
I would say there's a chance the center is shifting east.
Member Since: Juli 11, 2006 Posts: 14 Comments: 10244
938. Levi32 07:02 PM GMT am 27. Juni 2009    
Quoting louisianaboy444:
The two Clip models have it going into Louisiana but aren't those models based on climatology?


Yes they are. They shouldn't be counted as track guidance, just a reference. As atmo said a path up the middle is not very likely but it is still possible.
Member Since: November 24, 2005 Posts: 586 Comments: 25441
939. atmoaggie 07:02 PM GMT am 27. Juni 2009    
Quoting louisianaboy444:
The two Clip models have it going into Louisiana but aren't those models based on climatology?


exactly, and persistence, which is somewhat like including XTRP in an ensemble.

And based in the mid-level steering, and the current guessed location, I am heavily leaning towards a Northern Mexico path.

I do not think it will become a deep enough system to consider upper level steering until spending a while in the BOC.
Member Since: August 16, 2007 Posts: 6 Comments: 12461
941. louisianaboy444 07:03 PM GMT am 27. Juni 2009    
Yes they are. As atmo said a path up the middle is not very likely but it is still possible.

Thanks guys, I'm going to school to be a Met but i'm only starting my 2nd year of college still have lots to learn apparently
Member Since: August 29, 2006 Posts: 17 Comments: 1218
942. sporteguy03 07:03 PM GMT am 27. Juni 2009    
Quoting louisianaboy444:
The two Clip models have it going into Louisiana but aren't those models based on climatology?

Correct based on past storms who were in the same area as the current system. Not to be ignored but since it is based on past systems it does not take into account present conditions.
Member Since: Juli 7, 2005 Posts: 0 Comments: 4824
944. scottsvb 07:05 PM GMT am 27. Juni 2009    
Everything matters on how much of the trough digs down and retrogrades into the Deep South. If 93L makes it west of 90W.. it may meander long or even push WSW towards the BOC.. but the best odds are on it staying east of 88W and moving NE or even ENE.. questions will arise on is this a system or just a disturbance heading towards florida.

Also just to note... the models are having a hard time recognizing a center 48hrs-84hrs out cause the pressure in the northeastern GOM will be falling to around 1004-1008mb... so the global model will have to see 93L as a developed 1004mb or stronger system to really pronounce it on the map...also this will be probably a small compact system like charley..but not nowhere as strong if anything at all develops.
So anotherwords..this is most likely why the globals dont show alot...cause the presure in the NE GOM will be low also from the trough!
Member Since: Januar 22, 2006 Posts: 0 Comments: 1065
945. cg2916 07:05 PM GMT am 27. Juni 2009    
Quoting Acemmett90:
Sat Update
It has banding



No offense... but I don't see banding.
Member Since: Dezember 21, 2007 Posts: 13 Comments: 2908
946. BahaHurican 07:07 PM GMT am 27. Juni 2009    
I have to give kudos to the amateur bloggers here (i.e. those who don't do this for a living) who still manage to follow the tropics with such diligence - and excellent accuracy. IMO we've some of the best of their ilk on this blog, and I'm hoping some of the younger ones among them are able to pursue meteorology as career. There's still so much to learn and understand about tropical cyclones; it's the passionate ones who can help us move to the next level.

I'm willing to put personalities aside in respect for that kind of interest in and devotion towards tropical weather observation and forecasting.
Member Since: Oktober 25, 2005 Posts: 19 Comments: 17588
947. WPBHurricane05 07:06 PM GMT am 27. Juni 2009    
I think the NAVY center is just a guess. Its been going .7 N .7 W every 6 hours for about 18 hours now...which would probably be unlikely if we had an actual surface low. Link
Member Since: Juli 31, 2006 Posts: 55 Comments: 7895
948. Cavin Rawlins 07:07 PM GMT am 27. Juni 2009    
Quoting WeatherStudent:


so it made official landfall already according to that image then, weather456?


The best track center appears to be along the coast. But it seems that track is being extrapolated.
Member Since: Juli 24, 2005 Posts: 407 Comments: 19076
949. sporteguy03 07:07 PM GMT am 27. Juni 2009    
Quoting scottsvb:
Everything matters on how much of the trough digs down and retrogrades into the Deep South. If 93L makes it west of 90W.. it may meander long or even push WSW towards the BOC.. but the best odds are on it staying east of 88W and moving NE or even ENE.. questions will arise on is this a system or just a disturbance heading towards florida.

Also just to note... the models are having a hard time recognizing a center 48hrs-84hrs out cause the pressure in the northeastern GOM will be falling to around 1004-1008mb... so the global model will have to see 93L as a developed 1004mb or stronger system to really pronounce it on the map...also this will be probably a small compact system like charley..but not nowhere as strong if anything at all develops.
So anotherwords..this is most likely why the globals dont show alot...cause the presure in the NE GOM will be low also from the trough!

Interesting info Scott thanks.
Member Since: Juli 7, 2005 Posts: 0 Comments: 4824
950. Chicklit 07:08 PM GMT am 27. Juni 2009    
Quoting BahaHurican:
I have to give kudos to the amateur bloggers here (i.e. those who don't do this for a living) who still manage to follow the tropics with such diligence - and excellent accuracy. IMO we've some of the best of their ilk on this blog, and I'm hoping some of the younger ones among them are able to pursue meteorology as career. There's still so much to learn and understand about tropical cyclones; it's the passionate ones who can help us move to the next level.

I'm willing to put personalities aside in respect for that kind of interest in and devotion towards tropical weather observation and forecasting.

Well said Baha.
Member Since: Juli 11, 2006 Posts: 14 Comments: 10244
951. cg2916 07:09 PM GMT am 27. Juni 2009    
Quoting Weather456:
2 PM Update

2009062718, , BEST, 0, 199N, 873W, 25, 1008, DB, 34, NEQ,


Where did you get that picture?
Member Since: Dezember 21, 2007 Posts: 13 Comments: 2908

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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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