Dr. Jeff Masters' WunderBlog

TD 7 dies; 93L little threat to develop
Posted by: Dr. Jeff Masters, 3:55 PM GMT on August 11, 2012 +32
Tropical Depression Seven is dead, ripped apart by moderate wind shear of 10 - 20 knots this Saturday morning. The storm was too small and fragile to survive the shear, thanks to dry air from the Sahara that had infiltrated the storm environment. None of the reliable models forecasts that TD 7 will regenerate as it tracks westwards across the Caribbean over the next four days. The remains of the storm should arrive in Mexico's Yucatan Peninsula on Wednesday.


Figure 1. Morning satellite image of the remnants of TD 7.

93L
A large tropical wave(Invest 93L) is located in the Eastern Atlantic about 300 miles northwest of the Cape Verde Islands. Satellite loops show a pronounced spin to the atmosphere at mid levels, but little in the way of heavy thunderstorm activity. The latest Saharan Air Layer Analysis from the University of Wisconsin shows that there is a large area of dry air from the Sahara surrounding 93L, which has infiltrated into the storm. This dry air will be a significant impediment to development during the coming week, as the 8 am EDT run of the SHIPS model predicts dryness at mid-levels of the atmosphere will increase during the next five days. None of the reliable computer models develop 93L during the coming seven days, and the storm is expected to move west-northwest and then north, recurving well to the east of Bermuda. In their 8 am Tropical Weather Outlook, NHC gave 93L a 20% chance of becoming a tropical depression by Monday morning.

I'll have a new post on Sunday.

Jeff Masters
Categories: Hurricane
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151. PalmBeachWeather 6:14 PM GMT on August 11, 2012    
Quoting kmanislander:


The behaviour on the blog is inversely proportional to tropical storm activity.
You can set a watch by it
Member Since: October 3, 2008 Posts: 0 Comments: 3084
152. pmzqqzmp 6:16 PM GMT on August 11, 2012    
Quoting PalmBeachWeather:
wash......... Trust me friend.. Not fun at all... As a very young girl I was in the Xenia Ohio tornado April 3,1974, then moved to Florida... Was on the edge of Andrew August 1992, then was in Francis and Jeanne 2004...... Then Wilma 2005... I tell all of my friends "Don't follow me" The tornado and Wilma both had me thinking about death..... Not fun .


Amen. Wishcasters just have a sickness I keep telling myself. It keeps me from going crazy on them.

I was without power in my neighborhood for 6 months after Andrew. I was in the middle of Cutler Ridge in south Dade. I know what the power of 165 mph sustained winds can do, and its not fun to think you are going to die for 4 hours of storm, and then in the aftermath wished you had died because of the nightmare I lived afterwards.

I had to even shoot someone to protect my property. I've never lost that guilty feeling even though it was in self-defense.
Member Since: August 25, 2011 Posts: 0 Comments: 34
153. washingtonian115 6:20 PM GMT on August 11, 2012    
Not my fault you had to go through Andrew.That's where you moved that's where you wanted to live.Just have to go through the consequences of living in south Florida which is known for hurricane alley.How does that make me a wishcaster for wanting me myself and I to go through a storm only?..I didn't say I wanted death or destruction.
Member Since: August 14, 2010 Posts: 5 Comments: 10679
154. ncstorm 6:21 PM GMT on August 11, 2012    
If anyone on this blog thinks the GFS has a good handle on these CV storms that its shows going in circles is sadly mistaken..watch the runs shift back more west..
Member Since: August 19, 2006 Posts: 7 Comments: 8489
155. MAweatherboy1 6:23 PM GMT on August 11, 2012    
End of the 12z GFS run... Lots of recurve action:

Member Since: February 11, 2012 Posts: 67 Comments: 6379
156. ncstorm 6:26 PM GMT on August 11, 2012    
Quoting washingtonian115:
Not my fault you had to go through Andrew.That's where you moved that's where you wanted to live.Just have to go through the consequences of living in south Florida which is known for hurricane alley.How does that make me a wishcaster for wanting me myself and I to go through a storm only?..I didn't say I wanted death or destruction.


whatever Wash, let em be...I love tracking storms and the excitement of them heading towards me..I have been through at LEAST 10 storms..three of them majors..I have been without power for over three weeks in NC humidity..standing in lines in 100 degree weather for ice..having to rebuild..but yet I am still here tracking storms..you dont have to explain yourself..some will admit and some wont..
Member Since: August 19, 2006 Posts: 7 Comments: 8489
157. ncstorm 6:28 PM GMT on August 11, 2012    
Quoting GTcooliebai:
Too bad we were so young to remember the '93 Superstorm that brought that intense line of thunderstorms and brought numerous tornadoes throughout the state. I was outside in my porch when it came through and my mom had to pull me inside because debris was flying around outside that ended up damaging our porch. When it passed our street was blocked off and they wouldn't let my dad in.

Not to mention a storm surge higher than most hurricanes!



We got the ice and loss of power..will never forget that one
Member Since: August 19, 2006 Posts: 7 Comments: 8489
158. washingtonian115 6:29 PM GMT on August 11, 2012    
Quoting ncstorm:


whatever Wash, let em be...I love tracking storms and the excitement of them heading towards me..I have been through at LEAST 10 storms..three of them majors..I have been without power for over three weeks in NC humidity..standing in lines in 100 degree weather for ice..having to rebuild..but yet I am still here tracking storms..you dont have to explain yourself..some will admit and some wont..
Well I'm glad the models at least show some action in the tropics.just what the Doctor order.Some strong cape verde storms way out to sea.
Member Since: August 14, 2010 Posts: 5 Comments: 10679
159. Grothar 6:30 PM GMT on August 11, 2012    



I don't ask you people for much, but I would really like it if you would read my blog. I just did. You may find it useful considering the discussions.

Go ahead, go take a look. It is brief.


Member Since: July 17, 2009 Posts: 57 Comments: 19554
160. LoneStarWeather 6:31 PM GMT on August 11, 2012    
Quoting washingtonian115:
Not my fault you had to go through Andrew.That's where you moved that's where you wanted to live.Just have to go through the consequences of living in south Florida which is known for hurricane alley.How does that make me a wishcaster for wanting me myself and I to go through a storm only?..I didn't say I wanted death or destruction.

+1000000. The only people on here with a sickness are those who bash the folks who are excited about hurricanes. None of us are wishing for death and/or destruction. We just admire and are in awe of these magnificent heat engines that none of us have any influence over. Blame mother nature for your situation, not your fellow weather enthusiast.
Member Since: September 8, 2001 Posts: 0 Comments: 391
161. kmanislander 6:32 PM GMT on August 11, 2012    
This is interesting. It's not 93L but it does match up with the area of vorticity to the South of 93L. Two separate features.



Member Since: August 19, 2006 Posts: 0 Comments: 14939
162. unknowncomic 6:33 PM GMT on August 11, 2012    
Quoting KEEPEROFTHEGATE:



green line is where we are in the season lots of season too come
one or two weeks and it will be totally different.
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163. ncstorm 6:34 PM GMT on August 11, 2012    
12z Euro running

whats that in the BOC? 144 hours
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164. stormpetrol 6:35 PM GMT on August 11, 2012    
I think ex td7 has redeveloped a weak surface circulation.
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165. washingtonian115 6:36 PM GMT on August 11, 2012    
Quoting ncstorm:
12z Euro running

whats that in the BOC? 144 hours
Maybe the energy of 97L?.Does seem like a possibility since the steering flow would take it in that direction.

Thanks LoneStarWeather.
Member Since: August 14, 2010 Posts: 5 Comments: 10679
166. GTcooliebai 6:37 PM GMT on August 11, 2012    
Quoting MAweatherboy1:
End of the 12z GFS run... Lots of recurve action:

This makes sense to have 4 storms out there nearing the peak of the hurricane season, of course it is 384 hrs. out and like always, subject to change.
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167. kmanislander 6:37 PM GMT on August 11, 2012    
Quoting stormpetrol:
I think ex td7 has redeveloped a weak surface circulation.


It is certainly looking mighty suspicious and much stronger than 6 hours ago. The vort at 850 mb has spiked up as well.

Member Since: August 19, 2006 Posts: 0 Comments: 14939
168. aislinnpaps 6:37 PM GMT on August 11, 2012    
Quoting LoneStarWeather:

+1000000. The only people on here with a sickness are those who bash the folks who are excited about hurricanes. None of us are wishing for death and/or destruction. We just admire and are in awe of these magnificent heat engines that none of us have any influence over. Blame mother nature for your situation, not your fellow weather enthusiast.


I don't mind the adults so much, but the kids sometimes get to me. They don't understand what they are wishing for.
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169. Tazmanian 6:38 PM GMT on August 11, 2012    
hey guys i took back my ipad 2 and got me the new ipad today and love marh better
Member Since: May 21, 2006 Posts: 5088 Comments: 111360
170. wunderkidcayman 6:39 PM GMT on August 11, 2012    
hey guys I just look at some stuff and "tropcal wave 7's" environment is not as bad as previously thought as on new shear map it is noted that an ULAC or upper level anticyclone is now starting to develop with this system curently located on the southern half of the wave if that ULAC can build as it moves WNW then we could be looking at more than 10% of redevelopment





just saying this Could Be

also remeber I said yesterday that ULL in the atlantic would move S and the one in the NW caribbean would move NW and that an ULAC could develop well I think that could be happening

so for NOW 10% for RDEVELOPMENT
depending on what happen to the conditions later today and tomorrow that 10% could be bumped up
Member Since: June 13, 2009 Posts: 2 Comments: 5510
171. Grothar 6:40 PM GMT on August 11, 2012    
Quoting stormpetrol:
I think ex td7 has redeveloped a weak surface circulation.


What you are seeing is an unexpected flareup of convection. Let's see how long it lasts.
Member Since: July 17, 2009 Posts: 57 Comments: 19554
172. nofailsafe 6:40 PM GMT on August 11, 2012    
Quoting MAweatherboy1:
End of the 12z GFS run... Lots of recurve action:



This is what I would call: "A ludicrously long time from now."
Member Since: June 18, 2010 Posts: 3 Comments: 834
173. wunderkidcayman 6:41 PM GMT on August 11, 2012    
Quoting stormpetrol:
I think ex td7 has redeveloped a weak surface circulation.

you could be corect but for now I'll leave it as open wave
Member Since: June 13, 2009 Posts: 2 Comments: 5510
174. washingtonian115 6:41 PM GMT on August 11, 2012    
Quoting GTcooliebai:
This makes sense to have 4 storms out there nearing the peak of the hurricane season, of course it is 384 hrs. out and like always, subject to change.
Also the MJO is suppose to be over here with a strong pulse over africa.

168..l'm a adult and fully know what I'm getting into.
Member Since: August 14, 2010 Posts: 5 Comments: 10679
175. ncstorm 6:41 PM GMT on August 11, 2012    
NC/SC is getting slammed with thunderstorms..cloud cover was supposed to inhibit convection but the sun has been showing here with some clouds most of the day..

Member Since: August 19, 2006 Posts: 7 Comments: 8489
176. kmanislander 6:42 PM GMT on August 11, 2012    
Winds in Barbados are 22 KPH out of the South so no surface low apparently as one would expect a West wind there. Still just a sharp wind shift as seen by the HH earlier. Convection is on the rise though.
Member Since: August 19, 2006 Posts: 0 Comments: 14939
177. kmanislander 6:45 PM GMT on August 11, 2012    
Crown Point Tobago winds from the SE @ 15 KPH

Definitely no resumption of a surface low at this time with 97L as winds here would have to also be out of the West.
Member Since: August 19, 2006 Posts: 0 Comments: 14939
178. hurrtracker1994 6:45 PM GMT on August 11, 2012    
Quoting wunderkidcayman:
hey guys I just look at some stuff and "tropcal wave 7's" environment is not as bad as previously thought as on new shear map it is noted that an ULAC or upper level anticyclone is now starting to develop with this system curently located on the southern half of the wave if that ULAC can build as it moves WNW then we could be looking at more than 10% of redevelopment





just saying this Could Be

also remeber I said yesterday that ULL in the atlantic would move S and the one in the NW caribbean would move NW and that an ULAC could develop well I think that could be happening

so for NOW 10% for RDEVELOPMENT
depending on what happen to the conditions later today and tomorrow that 10% could be bumped up


You also need to take into account the dry sinking air in front of the system.

Member Since: May 23, 2010 Posts: 6 Comments: 127
179. popartpete 6:45 PM GMT on August 11, 2012    
Quoting GTcooliebai:
Too bad we were so young to remember the '93 Superstorm that brought that intense line of thunderstorms and brought numerous tornadoes throughout the state. I was outside in my porch when it came through and my mom had to pull me inside because debris was flying around outside that ended up damaging our porch. When it passed our street was blocked off and they wouldn't let my dad in.

Not to mention a storm surge higher than most hurricanes!

I was in the 1993 superstorm derecho in Pasco County, Florida. We were not expecting it. No one mentioned it earlier that day. It had been the most normal day and absolutely beautiful in the mid-80's. Around 10 p.m. that night we heard the warnings from the Weather Channel and all hell broke loose about midnight or just thereafter. It was worse than any hurricane I've been through. We had no time to prepare at all, and I think that made it so much worse.
Member Since: July 10, 2007 Posts: 0 Comments: 415
180. ncstorm 6:45 PM GMT on August 11, 2012    
NWS, wilmington, NC

they must have been reading this blog lately..the models dont have a handle on the severe weather threat

.NEAR TERM /THROUGH TONIGHT/...
AS OF 1:25 PM SATURDAY...MAIN FORECAST DILEMMA WILL BE POPS MAINLY
FOR THE OVERNIGHT HOURS AS THE GFS AND TO SOME EXTENT THE NAM ARE
BULLISH ON THE SYNOPTIC SCENARIO. IT APPEARS THE MAIN 200MB JET
ROTATES PERFECTLY ACROSS THE REGION FOR RIGHT ENTRANCE REGION
DYNAMICS AND WITH WATER VAPOR IMAGERY SHOWING A MOISTURE LADEN
ATMOSPHERIC RIVER...CATEGORICAL POPS SEEM LIKE A LOGICAL CHOICE.
THIS FEATURE APPEARS TO BE THE CATALYST FOR THE CONVECTION CURRENTLY
ALONG THE GULF COAST. WILL NOWCAST THE NEXT FEW HOURS...THEN A MORE
GENERALLY 80-90 POP FOR THE OVERNIGHT EARLY MORNING HOURS.
MAINTAINED A STRATEGY OF GOING SLIGHTLY WARMER THAN GUIDANCE FOR LOW
TEMPERATURES.

Member Since: August 19, 2006 Posts: 7 Comments: 8489
181. stormpetrol 6:46 PM GMT on August 11, 2012    


Conditions ahead of ex td7 are alot less hostile for redevelopment than they are now , just my opinion though, I've seen storms die out in this area only to strengthen again central caribbean.
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182. kmanislander 6:48 PM GMT on August 11, 2012    
Quoting stormpetrol:


Conditions ahead of ex td7 are alot less hostile for redevelopment than they are now , just my opinion though, I've seen storms die out in this area only to strengthen again central caribbean.


Never say never but conditions also dry as a bone

Member Since: August 19, 2006 Posts: 0 Comments: 14939
183. popartpete 6:48 PM GMT on August 11, 2012    
For all of us that were calling these "pre-Gordon" and "pre-Helene" days ago...bad to count chickens before they're hatched.
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184. 954FtLCane 6:49 PM GMT on August 11, 2012    
hey wash I suggest if you want to get hit by a storm that you move to a more hurricane prone area. We don't need DC being hit with a storm. I mean how would the politicians get anything done?....lol
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185. Clearwater1 6:49 PM GMT on August 11, 2012    
Quoting GTcooliebai:
The GFS has been on and off with development of Cape Verde Waves so far which leads me to believe that we might not have a very active Cape Verde Season which is kind of dangerous because it leads to more home grown development that have a higher chance of making landfall. We'll see though because the peak of the hurricane season is not until the 2nd week of Sept. which is still a month away.


I'm wondering why you think that an inactive CV season would lead to a more active home grown season. Your reasoning please.
Member Since: August 26, 2006 Posts: 0 Comments: 1502
186. WoodyFL 6:50 PM GMT on August 11, 2012    
Quoting Grothar:



I don't ask you people for much, but I would really like it if you would read my blog. I just did. You may find it useful considering the discussions.

Go ahead, go take a look. It is brief.




nice blog gro, you should have been a teacher.
Member Since: April 24, 2011 Posts: 1 Comments: 442
187. Grothar 6:50 PM GMT on August 11, 2012    
Quoting WoodyFL:


nice blog gro, you should have been a teacher.



Very funny! :)
Member Since: July 17, 2009 Posts: 57 Comments: 19554
188. Grothar 6:51 PM GMT on August 11, 2012    
Quoting 954FtLCane:
hey wash I suggest if you want to get hit by a storm that you move to a more hurricane prone area. We don't need DC being hit with a storm. I mean how would the politicians get anything done?....lol


hey 954, Getting those heavy rains right now?
Member Since: July 17, 2009 Posts: 57 Comments: 19554
189. weatherh98 6:52 PM GMT on August 11, 2012    
Quoting Grothar:



Very funny! :)
not passed teaching fifth graders though:P
Member Since: June 17, 2011 Posts: 11 Comments: 6095
190. Tribucanes 6:52 PM GMT on August 11, 2012    
ncstorm as a wishcaster?? Never have I read ncstorm wishcasting. Pretty sick though being without power for six months after Andrew. Like you said ncstorm a few days ago: We all watch here for the big one, we get excited when it happens, we don't want destruction; but it's hard to turn away while it's happening. It's quite possible to pray for those in the path of and still watch in awe when the cane does what it's going to do anyway; irregardless of what we think or feel. I feel horrible for anyone who's ever suffered through a major. My folks live on the east coast of Florida. They've been there for about five years now. They think the big one, literally, can't or won't hit them. They went through the eye wall of Beryl this year and got tapped a little by Debbie, which gave them a false sense of security during named storms. They've had a few false alarms where they boarded up and left, so I doubt they'd leave in a major now. They are seven miles from the sea, they think that's far enough to avoid any surge. Talk about a double face palm. ncstorm is a very quality member here imo.
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191. Tazmanian 6:53 PM GMT on August 11, 2012    
Where is 97L?
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192. HurricaneDevo 6:53 PM GMT on August 11, 2012    
Quoting Grothar:



I don't ask you people for much, but I would really like it if you would read my blog. I just did. You may find it useful considering the discussions.

Go ahead, go take a look. It is brief.





That blog is exactly correct. The hard part of psychological aspects is getting people to see their own behavior in an objective light.
Member Since: April 19, 2011 Posts: 0 Comments: 116
193. Abacosurf 6:53 PM GMT on August 11, 2012    
Quoting aislinnpaps:


I don't mind the adults so much, but the kids sometimes get to me. They don't understand what they are wishing for.
And most probably didn't even pay for the computer they play on....
Member Since: August 28, 2008 Posts: 0 Comments: 911
194. GTcooliebai 6:53 PM GMT on August 11, 2012    
Trough to Mid-Upper Level Low interaction will be interesting:

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195. 7544 6:54 PM GMT on August 11, 2012    
nice blob now south of fla is it moving north
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196. 954FtLCane 6:55 PM GMT on August 11, 2012    
Quoting Grothar:


hey 954, Getting those heavy rains right now?


Yep,nice cool and refreshing! How's bout u? BTW I didn't find any bugs on my trees this morning.
Member Since: September 30, 2008 Posts: 0 Comments: 1464
197. sar2401 6:55 PM GMT on August 11, 2012    
Quoting wunderkidcayman:
hey guys I just look at some stuff and "tropcal wave 7's" environment is not as bad as previously thought as on new shear map it is noted that an ULAC or upper level anticyclone is now starting to develop with this system curently located on the southern half of the wave if that ULAC can build as it moves WNW then we could be looking at more than 10% of redevelopment





just saying this Could Be

also remeber I said yesterday that ULL in the atlantic would move S and the one in the NW caribbean would move NW and that an ULAC could develop well I think that could be happening

so for NOW 10% for RDEVELOPMENT
depending on what happen to the conditions later today and tomorrow that 10% could be bumped up


WKC, the blob over Grenada and Venezuela looks better than the leftovers from TD7. I suspect a 10% chance of redevelopment is being generous. I've sailed through many a tropical wave that looked more threatening than what I see on the satellite now.
Member Since: October 2, 2004 Posts: 0 Comments: 1988
198. PalmBeachWeather 6:55 PM GMT on August 11, 2012    
Quoting unknowncomic:
one or two weeks and it will be totally different.
Just curious.Do you have a brown paper bag over your head with the eyes cut out........Do youknow Chuck Barris.........Do you know what a gong is?
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199. Grothar 6:55 PM GMT on August 11, 2012    
Quoting weatherh98:
not passed teaching fifth graders though:P


:)
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200. icmoore 6:56 PM GMT on August 11, 2012    
Weren't some of the models earlier in Aug pointing at storm development between the 17 and 23 or 24? I think it will heat up as the month goes on not to mention storms around Labor Day. Sept can be a bear.
Member Since: July 18, 2005 Posts: 9 Comments: 4062
201. Grothar 6:56 PM GMT on August 11, 2012    
Quoting PalmBeachWeather:
Just curious.Do you have a brown paper bag over your head with the eyes cut out........Do youknow Chuck Barris.........Do you know what a gong is?


He worked for the CIA you know.
Member Since: July 17, 2009 Posts: 57 Comments: 19554

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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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