Dr. Jeff Masters' WunderBlog

Tropical wave bringing heavy rain to northern Lesser Antilles
Posted by: Dr. Jeff Masters, 01:57 PM GMT on Juli 18, 2010 +3
A tropical wave near 18N, 60W is entering the northernmost Lesser Antilles Islands and is generating some disorganized heavy thunderstorm activity. This wave is under about 20 knots of wind shear, due to strong upper-level westerly winds. The strong upper-level winds are associated with the counter-clockwise flow of air around an upper-level cold-cored low pressure system a few hundred miles north of Puerto Rico. As the wave progresses west to west-northwest through Tuesday, thunderstorm activity will increase, due to interaction with the upper low. The rains from these thunderstorms will bring the threat of flooding to Puerto Rico on Monday, the Dominican Republic on Tuesday, and Haiti on Wednesday. The upper low will also bring high wind shear of 20 - 30 knots over the the wave on Monday and Tuesday. No development of the wave is likely until at least Thursday, when it will be over the eastern Bahamas and eastern Cuba. At that time, shear is expected to drop below 20 knots, and the wave has the potential to develop. However, none of the reliable computer models is calling for tropical cyclone development over the next seven days. I expect that this wave will eventually enter the Gulf of Mexico early next week. NHC is giving the wave a 10% chance of developing into a tropical depression by Tuesday.


Figure 1. Morning satellite image of tropical wave entering the Lesser Antilles Islands.

Next post
I'll have a new post on Monday.

Jeff Masters
Categories: Hurricane
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1101. Patrap 10:24 PM GMT on Juli 18, 2010    
Member Since: Juli 3, 2005 Posts: 377 Comments: 113014
1102. TropicalAnalystwx13 10:25 PM GMT on Juli 18, 2010    
Quoting Stormchaser2007:
TxMarc71

Mail.

Ciao everyone. Have a good night.


See ya!
Member Since: Juli 6, 2010 Posts: 92 Comments: 25992
1103. MiamiHurricanes09 10:25 PM GMT on Juli 18, 2010    
Quoting scott39:
What model is that?
GFS. It's under the upper air graphics tab. It's referred to as "850mb vort".
Member Since: September 2, 2009 Posts: 129 Comments: 20012
1104. Cavin Rawlins 10:25 PM GMT on Juli 18, 2010    
Good Evening to all

Blog Update

Several features to keep an eye on
Member Since: Juli 24, 2005 Posts: 407 Comments: 19076
1105. scott39 10:25 PM GMT on Juli 18, 2010    
Quoting MiamiHurricanes09:
GFS. It's under the upper air graphics tab. It's referred to as "850mb vort".
Is it reliable?
Member Since: Juni 13, 2009 Posts: 0 Comments: 6221
1106. JLPR2 10:25 PM GMT on Juli 18, 2010    
Things tend to look ominous and intimidating in this sat pics and the TW here is a long way from looking intimidating, therefore it isn't.

Member Since: September 4, 2007 Posts: 7 Comments: 7534
1107. hunkerdown 10:26 PM GMT on Juli 18, 2010    
Quoting wfyweather:


Who said I didn't have experience or knowledge? I think you have NO IDEA how much knowledge or experience I have!!
from your brief comments you have proven yourself
Member Since: August 15, 2008 Posts: 0 Comments: 2514
1108. wfyweather 10:27 PM GMT on Juli 18, 2010    
Quoting hunkerdown:
from your brief comments you have proven yourself


Want to show me those brief comments in which I have proven myself? I happen to have over 13 years in forecasting experience... and more knowledge than at least half of the folks here...
Member Since: Juli 12, 2008 Posts: 11 Comments: 422
1109. CCstormer 10:27 PM GMT on Juli 18, 2010    
Quoting Bolero:
XCool, you shouldn't have a young boy looking and reading through a public online weather forum/blog, you caught my dirft there, WTF, :0. Assuming of course, it's actually happening. BTW, aquack, Senior year, madame, I'll be hopefully off to graduate School next fall, I've taken' the LSAT already, hopefully I passed, and then I'll be of to Law School, ma'am.



That is interesting. I took the LSAT recently, and I have my score. One other observation, you do not "pass" the LSAT. Go on to your account at LSAC.org and retrieve your score.

And to stay on topic, I am liking the wave for slow development. Westward as well. I believe that is a relatively safe bet.
Member Since: Juli 21, 2008 Posts: 0 Comments: 46
1110. earthlydragonfly 10:27 PM GMT on Juli 18, 2010    
Quoting BahaHurican:
Ya'll are living in a dream world.

1. Who says trolls can't afford membership fees?

2. If pple WOULD STOP TALKING ABOUT THE GUY there would be no problem. So far 2day I have [-]ed about 20 posts by the alleged troll and nearly 200 by bloggers who quote him, talk to and about him, and warn others to stop. THIS IS THE NON-WEATHER CONVERSATION THAT IS KILLING THE BLOG. I have been fed up all day because I can't see the wx conversation w/out having to wade through all the other non-wx comments. And some of the very pple lamenting the state of the blog are the ones who are causing the horrible state!!!!!

I keep promising not to post again about what other pple are saying, and I will try to stick to that promise in the future. However, I will say it again, and I have a feeling a lot of bloggers are quietly using their keypads to do the same:

Any blogger who a) quotes a troll b) responds to a troll's baiting c) references or draws attention to a troll d) cracks jokes on a troll or e) quotes anybody who does any of the a) to d) above will be [-]ed and [!] as necessary.

Less talk; more action, concerned bloggers.
You are correct sir. Great point. I will stop falling into the trap.
Member Since: Juli 1, 2005 Posts: 10 Comments: 1653
1112. Ivanhater 10:28 PM GMT on Juli 18, 2010    
162

Member Since: Juni 11, 2010 Posts: 0 Comments: 53
1113. AllyBama 10:28 PM GMT on Juli 18, 2010    
testy to day?....hmmmmm...looks like we need a "real" storm to track in order to soothe the flare-up of "stormy" weather in here...
Member Since: August 3, 2006 Posts: 131 Comments: 20504
1115. ackee 10:29 PM GMT on Juli 18, 2010    

The weather overcast slight rain the met office had issue flash flood watch yesterday
Member Since: Juli 15, 2008 Posts: 0 Comments: 1196
1116. Patrap 10:29 PM GMT on Juli 18, 2010    
Day-ummm..


Swirls at da Mouth of the River...casting ?


That will change, First out never gets the worm.



Member Since: Juli 3, 2005 Posts: 377 Comments: 113014
1118. TropicalAnalystwx13 10:30 PM GMT on Juli 18, 2010    
Quoting hurrkat05:
ok guys the wave off africa is about to get swallowed up by the ploom of dry air...no chance for development here are anywhere else for the next 10 days..


Wrong Wrong Wrong...
Member Since: Juli 6, 2010 Posts: 92 Comments: 25992
1119. nrtiwlnvragn 10:30 PM GMT on Juli 18, 2010    
Quoting HurricaneSwirl:


Repost #4..


There may not have been any advisories from HPC on Alex. Issuance of Tropical Cyclone Advisories by HPC:

Excerpt:

Under NWS Directive 10-601 Section 6.9.2.2, "The HPC will issue public advisories after NHC discontinues its advisories on subtropical and tropical cyclones that have moved inland, but still pose a threat of heavy rains and flash floods in the conterminous United States or adjacent areas within Mexico which affect the drainage basins of NWS River Forecast Centers.



Member Since: September 23, 2005 Posts: 12 Comments: 9096
1120. Ivanhater 10:30 PM GMT on Juli 18, 2010    
Doesnt look like a western Gulf threat with the ridge breaking down over the northern gulf

Member Since: Juni 11, 2010 Posts: 0 Comments: 53
1121. Chicklit 10:30 PM GMT on Juli 18, 2010    
Evening everyone, looks like the Leeward Islands are encountering the wave.

Loop

Nice little spin but doesn't look too bad yet.
Member Since: Juli 11, 2006 Posts: 14 Comments: 10382
1122. MiamiHurricanes09 10:31 PM GMT on Juli 18, 2010    
Quoting scott39:
Is it reliable?
It's the parallel GFS, the way you view it is the only difference.
Member Since: September 2, 2009 Posts: 129 Comments: 20012
1123. Cavin Rawlins 10:31 PM GMT on Juli 18, 2010    
Quoting Bolero:
thank you, 456! evening, how you've been, my friend? ^_^.


Been good.
Member Since: Juli 24, 2005 Posts: 407 Comments: 19076
1124. Skyepony (Mod) 10:31 PM GMT on Juli 18, 2010    
NEW ORLEANS — A federal official said Sunday that scientists are concerned about a seep and possible methane seen near BP's busted oil well in the Gulf of Mexico.

Both could be signs there are leaks in the well that's been capped off for three days.

The official spoke to The Associated Press on condition of anonymity Sunday because an announcement about the next steps had not yet been made.

The official is familiar with the spill oversight but would not clarify what is seeping near the well. The official said BP is not complying with the government's demand for more monitoring. BP spokesman Mark Salt declined to comment on the allegation, but said "we continue to work very closely with all government scientists on this."
Member Since: August 10, 2005 Posts: 145 Comments: 29993
1125. TropicalAnalystwx13 10:31 PM GMT on Juli 18, 2010    
Tonight:

Warm, with a 100% chance of arguing.
Member Since: Juli 6, 2010 Posts: 92 Comments: 25992
1126. wfyweather 10:31 PM GMT on Juli 18, 2010    
Quoting hurrkat05:
ally a real storm won't develop until around the 10th of august...all these blobs are exactly blobs not going to do anything..


Exactly blobs? No... not exactly. ;) They are tropical disturbances... well.... the one near the leeward and the one of the African Coast are.... I agree that it may be a while until actual formation occurs... but August 10th is probably a little bit of an over statement
Member Since: Juli 12, 2008 Posts: 11 Comments: 422
1128. Welling2000 10:32 PM GMT on Juli 18, 2010    
Hi. I'm here reading, often. Like many others, I appreciate the insight, knowledge and educational value found here on this blog.

As far as the issues with 'trolls', please remember that no matter what anyone says to you, only you are responsible for your reactions. The best reaction is to ignore.

Thanks again for the appropriate use of this blog. And now back to the tropical weather....
Member Since: Juli 19, 2008 Posts: 0 Comments: 38
1130. Ivanhater 10:34 PM GMT on Juli 18, 2010    
Where is New Orleans

Member Since: Juni 11, 2010 Posts: 0 Comments: 53
1132. MiamiHurricanes09 10:34 PM GMT on Juli 18, 2010    
Quoting Ivanhater:
Where is New Orleans

That is the parallel 18z GFS correct?
Member Since: September 2, 2009 Posts: 129 Comments: 20012
1133. extreme236 10:35 PM GMT on Juli 18, 2010    
Quoting Weather456:
Good Evening to all

Blog Update

Several features to keep an eye on


Great update!
Member Since: August 2, 2007 Posts: 19 Comments: 19234
1135. TropicalAnalystwx13 10:35 PM GMT on Juli 18, 2010    
Quoting wfyweather:


Exactly blobs? No... not exactly. ;) They are tropical disturbances... well.... the one near the leeward and the one of the African Coast are.... I agree that it may be a while until actual formation occurs... but August 10th is probably a little bit of an over statement


I think the wave off the coast of Africa will develop if it can make it past SAL. ALl it needs to do iis better define its closed circulation, acquire TS winds, and gain organized convection and we have TS Bonnie.
Member Since: Juli 6, 2010 Posts: 92 Comments: 25992
1136. Patrap 10:35 PM GMT on Juli 18, 2010    
#1130.

Usually between Jefferson and St. Bernard Parish.

Member Since: Juli 3, 2005 Posts: 377 Comments: 113014
1139. extreme236 10:36 PM GMT on Juli 18, 2010    
Quoting hurrkat05:
well wfy look at the charts the rtopics have hostile conditions..the dust rules the cape verdes and the shear rules the caribbean sea...


Uh there is no high shear over the Caribbean lol can you read a map? Link
Member Since: August 2, 2007 Posts: 19 Comments: 19234
1140. scott39 10:36 PM GMT on Juli 18, 2010    
Quoting TropicalAnalystwx13:


I think the wave off the coast of Africa will develop if it can make it past SAL. ALl it needs to do iis better define its closed circulation, acquire TS winds, and gain organized convection and we have TS Bonnie.
You dont think the leeward wave will develope first?
Member Since: Juni 13, 2009 Posts: 0 Comments: 6221
1142. TropicalAnalystwx13 10:36 PM GMT on Juli 18, 2010    
Quoting wfyweather:
1131. weatherman12345 10:34 PM GMT on July 18, 2010
Quoting wfyweather:


Exactly blobs? No... not exactly. ;) They are tropical disturbances... well.... the one near the leeward and the one of the African Coast are.... I agree that it may be a while until actual formation occurs... but August 10th is probably a little bit of an over statement

troll dont respond

I am far from a troll.... and I'd appreciate it if you dont attack me.. im not looking for a ban... and thats what ill get if i get attacked one more time..


No, No, he's saying that hurrikate is a troll and dont respond to her.
Member Since: Juli 6, 2010 Posts: 92 Comments: 25992
1143. msgambler 10:37 PM GMT on Juli 18, 2010    
Quoting Patrap:
#1130.

Usually between Jefferson and St. Bernard Parish.
Pat, where is it unusually?
Member Since: Februar 27, 2010 Posts: 0 Comments: 1120
1144. Patrap 10:37 PM GMT on Juli 18, 2010    
Quoting Skyepony:
NEW ORLEANS — A federal official said Sunday that scientists are concerned about a seep and possible methane seen near BP's busted oil well in the Gulf of Mexico.

Both could be signs there are leaks in the well that's been capped off for three days.

The official spoke to The Associated Press on condition of anonymity Sunday because an announcement about the next steps had not yet been made.

The official is familiar with the spill oversight but would not clarify what is seeping near the well. The official said BP is not complying with the government's demand for more monitoring. BP spokesman Mark Salt declined to comment on the allegation, but said "we continue to work very closely with all government scientists on this."


Saw dat skyepony.

Itsa creepy.

Member Since: Juli 3, 2005 Posts: 377 Comments: 113014
1146. wfyweather 10:37 PM GMT on Juli 18, 2010    
Quoting TropicalAnalystwx13:


I think the wave off the coast of Africa will develop if it can make it past SAL. ALl it needs to do iis better define its closed circulation, acquire TS winds, and gain organized convection and we have TS Bonnie.


Yes... I agree there.... if it can develop BEFORE hitting that dry, dusty air... the SAL may not even affect it that much... I think it has at least some chance.... but we also have to give it more time over water to see what happens with it.
Member Since: Juli 12, 2008 Posts: 11 Comments: 422
1147. Patrap 10:37 PM GMT on Juli 18, 2010    
Quoting msgambler:
Pat, where is it unusually?


Depends on how many Hurricane ya had at Pat O's usually.

Member Since: Juli 3, 2005 Posts: 377 Comments: 113014
1148. TropicalAnalystwx13 10:38 PM GMT on Juli 18, 2010    
Quoting scott39:
You dont think the leeward wave will develope first?


No, I dont think it will develop...
Member Since: Juli 6, 2010 Posts: 92 Comments: 25992
1149. stormpetrol 10:38 PM GMT on Juli 18, 2010    
I think the Jamaican Blob and African Blob has the most potential I give both at least a 50-50 chance of development tho just a layman.
Member Since: April 29, 2007 Posts: 0 Comments: 6498
1150. wfyweather 10:38 PM GMT on Juli 18, 2010    
1141. weatherman12345 10:36 PM GMT on July 18, 2010
Quoting wfyweather:
1131. weatherman12345 10:34 PM GMT on July 18, 2010
Quoting wfyweather:


Exactly blobs? No... not exactly. ;) They are tropical disturbances... well.... the one near the leeward and the one of the African Coast are.... I agree that it may be a while until actual formation occurs... but August 10th is probably a little bit of an over statement

troll dont respond

I am far from a troll.... and I'd appreciate it if you dont attack me.. im not looking for a ban... and thats what ill get if i get attacked one more time..

no no not you talkin bout the person u just quoted

Sorry man,,,,, been a rough day in my neck of the woods.
Member Since: Juli 12, 2008 Posts: 11 Comments: 422
1151. scott39 10:39 PM GMT on Juli 18, 2010    
Quoting TropicalAnalystwx13:


No, I dont think it will develop...
Hmmm, Why not?
Member Since: Juni 13, 2009 Posts: 0 Comments: 6221

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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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