Dr. Jeff Masters' WunderBlog

Tropical wave bringing heavy rain to northern Lesser Antilles
Posted by: Dr. Jeff Masters, 01:57 PM GMT del 18 Luglio 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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701. xcool 07:31 PM GMT del 18 Luglio 2010    
Member Since: Settembre 26, 2009 Posts: 2 Comments: 15526
703. reedzone 07:32 PM GMT del 18 Luglio 2010    
Quoting StormW:


Thanks MH09.

Anyone can answer this...what do you notice about the sst's from 15-17N off the African coast and westward into the Atlantic?


A dip south, then NW in high temps?
Member Since: Luglio 1, 2008 Posts: 13 Comments: 7249
704. MiamiHurricanes09 07:33 PM GMT del 18 Luglio 2010    
Quoting reedzone:


A dip south, then NW in high temps?
Yeah I was about to say the same thing.
Member Since: Settembre 2, 2009 Posts: 129 Comments: 20011
707. KEEPEROFTHEGATE (Mod) 07:34 PM GMT del 18 Luglio 2010    
Quoting CybrTeddy:
JFV's gone.. he'll be back. That was his second handle of the day.
he's still here
Member Since: Luglio 15, 2006 Posts: 147 Comments: 41332
709. MiamiHurricanes09 07:35 PM GMT del 18 Luglio 2010    
.
Member Since: Settembre 2, 2009 Posts: 129 Comments: 20011
710. Ivanhater 07:35 PM GMT del 18 Luglio 2010    
Notice the ridge retreated east on the Euro leaving the Northern Gulf at risk if any storm were to form...




Member Since: Giugno 11, 2010 Posts: 0 Comments: 53
711. reedzone 07:36 PM GMT del 18 Luglio 2010    
Quoting StormW:


Ok Reed, In your opinion, from those points south, still pretty much above normal?


Still high temps, yes.. I believe they are above normal, I think.
Member Since: Luglio 1, 2008 Posts: 13 Comments: 7249
712. IKE 07:36 PM GMT del 18 Luglio 2010    
OMG....this blog is just ridiculous.

I'm out 4 now..
Member Since: Giugno 9, 2005 Posts: 23 Comments: 37070
713. sporteguy03 07:36 PM GMT del 18 Luglio 2010    
Quoting IKE:


They need to start charging a few to get on here. They need to do something to permanently stop him.


Pay per post simple as that 20 posts for $1, 100 posts for $5 ,price can vary of course, bloggers who get "+" can get free posts, I rarely post anyways but it might help get the good info out there from a blogger.
Member Since: Luglio 7, 2005 Posts: 0 Comments: 4840
715. SAINTHURRIFAN 07:37 PM GMT del 18 Luglio 2010    
once again brownville texas slams 1 of ikes comments.Its getting old .people are emailing me and stating the same thing a lot of people agree your as annoying as the bolero toddler who is not man of enough to speak english to majority who do not know spanis.ike is right and so are some of the other knowledgable bloggers its dead right now.i really believeif God almighty came on this blog and said 0% chance of tropical formation you would argue with him and tell him he is wrong.Apologize to the rest of the bloggers but some of these kids need to get off these computers and get a life.
Member Since: Agosto 20, 2005 Posts: 5 Comments: 668
717. KEEPEROFTHEGATE (Mod) 07:39 PM GMT del 18 Luglio 2010    
this is too much
you have some big issues in the brain dept.
iam sorry
Member Since: Luglio 15, 2006 Posts: 147 Comments: 41332
718. MiamiHurricanes09 07:39 PM GMT del 18 Luglio 2010    
Quoting StormW:


Not picking on you, but just wanted to see if anyone answers.

Ok, why are they still pretty warm?
Ridging?
Member Since: Settembre 2, 2009 Posts: 129 Comments: 20011
719. help4u 07:39 PM GMT del 18 Luglio 2010    
Storm W the reason we ask is because we value you opinion.Appreciate your thoughts.
Member Since: Settembre 18, 2006 Posts: 0 Comments: 1079
722. MiamiHurricanes09 07:40 PM GMT del 18 Luglio 2010    
Quoting StormW:


No.
Negative NAO, weaker trades?
Member Since: Settembre 2, 2009 Posts: 129 Comments: 20011
723. reedzone 07:40 PM GMT del 18 Luglio 2010    
Quoting StormW:


Not picking on you, but just wanted to see if anyone answers.

Ok, why are they still pretty warm?


It's ok, I respect you

Umm, more heat in the atmosphere? We only had Alex, really hasn't cooled the Caribbean waters much, and the GOM continues to stay dry which creates more sunshine, more heat into the waters.
Member Since: Luglio 1, 2008 Posts: 13 Comments: 7249
724. spathy 07:41 PM GMT del 18 Luglio 2010    
The nao will help to reduce the sal.
In that scenario it will aid in increasing the SSTs off Africa?
Oh and the weakening of the ridge.
Member Since: Giugno 8, 2008 Posts: 65 Comments: 10529
725. xcool 07:41 PM GMT del 18 Luglio 2010    
Member Since: Settembre 26, 2009 Posts: 2 Comments: 15526
726. miamiamiga 07:41 PM GMT del 18 Luglio 2010    
Quoting StormW:


Not picking on you, but just wanted to see if anyone answers.

Ok, why are they still pretty warm?


StormW...PLEASE do not leave!

Now for my guess...weak trade winds?
Member Since: Maggio 6, 2005 Posts: 0 Comments: 115
727. palmpt 07:41 PM GMT del 18 Luglio 2010    
Quoting FLdewey:
Oh jeez now that drama opens the door to 4 hours of "Storm please don't go" posts. Time to go fire up the grill.


I have told him before don't do this... He is way to sensitive. Storm seems to think being here is some sort of job he does not like. I am here to read about weather and the tropics... and wish others would follow the rules. Stay on topic...
Member Since: Agosto 10, 2009 Posts: 0 Comments: 205
728. PanhandleChuck 07:41 PM GMT del 18 Luglio 2010    
Quoting reedzone:
Enjoy this quiet period because things will be changing by the end of the month into August. We are officially in a La Nina year and I believe it has pretty much shut the doors for storm development in the Eastern Pacific, excluding a few storms. The pattern is becoming more favorable in the Atlantic side, SST are boiling in the GOM over 9o degrees, we have major problems starting around August. The track pattern has been west as a nice bold high pressure has been sitting around the southern states, but models indication that is changing as well. A high in the Atlantic spreading WSW towards the southeastern USA should steer anything from the east, westward, this should allow storms to make it past 50-60W with no problem. The East Coast to the GOM coastline is in danger as the troughs swing by, depending on timing, they will either recurve storms away from land WEST of Bermuda like Bill in 2009, recurve storms going up the East Coast like Floyd in 1999, which was a La Nina year, or the trough is weak enough as a high builds in back of it to steer the storms north at some point, then westward, kind of like Frances in 2004. La Nina years have tendency to save us and recurve storms, meaning stronger troughs, while there's no indication of that, I am looking for some storms to recurve. 1995 is a prime example of storm recurvatures, which btw was also a La Nina year. So we really don't know what will happen, does the slowness of July lower my numbers? Absolute NOT! People who lower their predictions because of a slow month which is NORMAL for it to be this way, is foolish. So we'll see what happens..


Dude... Post the graph that shows avg. years usually have very little b4 August. I don't think everyone has seen it yet.. LOL
Member Since: Maggio 13, 2008 Posts: 0 Comments: 1189
730. Grecojdw 07:42 PM GMT del 18 Luglio 2010    
Don't go Storm W. I am a lurker who has been on here for years and your the posts I find the most reasonably and best suited especially when we do have track for storms. Just take a breather and continue your good work on this blog:)
Member Since: Gennaio 6, 2010 Posts: 0 Comments: 339
731. Patrap 07:43 PM GMT del 18 Luglio 2010    
A lil experience is like a lil War

..a Lot of Experience is the wisdom learned from it.


Member Since: Luglio 3, 2005 Posts: 377 Comments: 113003
732. reedzone 07:43 PM GMT del 18 Luglio 2010    
Quoting PanhandleChuck:


Dude... Post the graph that shows avg. years usually have very little b4 August. I don't think everyone has seen it yet.. LOL


Been posted by DestinJeff many times this weekend but people still assume a slow season is the right idea.. whatever. lol
Member Since: Luglio 1, 2008 Posts: 13 Comments: 7249
734. EricSFL 07:45 PM GMT del 18 Luglio 2010    
Bolero:

Thanks to people like you, us Hispanics have such a bad reputation in this country.
Member Since: Maggio 26, 2010 Posts: 0 Comments: 759
735. BradentonBrew 07:47 PM GMT del 18 Luglio 2010    
But it gets kinda old and redundant when I post data for folks that indicate certain things, and folks don't look closely at the info.

As a newbie, I hope you don't leave. But I would like to point out that the strictly posting of data without explanation makes things really difficult on us newbies.

Case in point: "....and the behavior of the MJO in the past 2 months. And if it does, it may be short lived, and the MJO could jump back to the Octants in our area."

People like me go, "Huh, MJO? Octants? What is that all? I don't mean to call you out specifically. Every day, I look for meaningful posts and I could count on my hand the number of times that I get an explanation as to a map or graphic or data that is posted to go along with the said data.

So now you got ppl who just post a link to a map with no narrative, no explanation and fifty people responding, Wow! Look at all those pretty colors and numbers. A lot of us and including those that have been here for a while are left to make conclusions, often WRONG conclusions because they are left to their own devices to come up with an explanation for the data or simple maps that are posted.

And, I realize Storm that you've done a great job to explain acronyms and such on your board and you are certainly the exception and have offered us Florida natives up to your place for better learning. However, I think if the knowledgeable ones around here would take just a moment or two and explain the data or maps that they are posting, it would go a long way in having the community avoid having 50 different interpretations of the data and the poster from saying, "Why don't you look at the data?"

Maybe somebody with time on their hands could develop a simple powerpoint as to explaining the maps and data formats that are out there?

Trust me, Storm. There are several impressionable people out here that are getting several incorrect interpretatons of the data and maps from other posters simply because the original poster just gives a link and no corresponding narrative.

Respectfully,
LCB (Bradenton, FL)
Member Since: Giugno 27, 2009 Posts: 0 Comments: 11
737. mcluvincane 07:47 PM GMT del 18 Luglio 2010    
I'm so sad cause storm might leave. Im totally lost for words. Now what am I going to do. Where's Levi?
Member Since: Giugno 2, 2010 Posts: 0 Comments: 1315
738. PanhandleChuck 07:48 PM GMT del 18 Luglio 2010    
Quoting reedzone:


Been posted by DestinJeff many times this weekend but people still assume a slow season is the right idea.. whatever. lol


I know, I was just kidding... What few in here don't realize is that Mother Nature is probably just winding up for the "pitch." I've said it before, IMHO come mid Sept., the naysayers in here will be screaming UNCLE!
Member Since: Maggio 13, 2008 Posts: 0 Comments: 1189
739. homelesswanderer 07:48 PM GMT del 18 Luglio 2010    
Quoting MiamiHurricanes09:
Negative NAO, weaker trades?


I'm with you MH. Oh and hello everyone.
Member Since: Agosto 15, 2008 Posts: 10 Comments: 3665
740. MiamiHurricanes09 07:49 PM GMT del 18 Luglio 2010    
Quoting StormW:


No...the SAL has not been heavy enough to cool down the sst's as it did in 2006. Hasn't been that thick.

What do you see?


Yes, it will effect some of the incipient waves, or even slow their development, but it wont' last
Smart thinkin' there Storm. It never occurred to me that SAL would have such a big effect in cooling SSTs.
Member Since: Settembre 2, 2009 Posts: 129 Comments: 20011
741. reedzone 07:49 PM GMT del 18 Luglio 2010    
Quoting StormW:


No...the SAL has not been heavy enough to cool down the sst's as it did in 2006. Hasn't been that thick.

What do you see?



Yes, it will effect some of the incipient waves, or even slow their development, but it wont' last


Interesting, I see it now.. Thanks :)
Member Since: Luglio 1, 2008 Posts: 13 Comments: 7249
743. homelesswanderer 07:50 PM GMT del 18 Luglio 2010    
Quoting homelesswanderer:


I'm with you MH. Oh and hello everyone.


Nevermind. SmileyCentral.com
Member Since: Agosto 15, 2008 Posts: 10 Comments: 3665
745. cirrocumulus 07:50 PM GMT del 18 Luglio 2010    
The U.S. Mainland is probably going to have a hurricane strike this year partly because of lower sunspot activity!
Member Since: Settembre 30, 2005 Posts: 0 Comments: 1606
746. MiamiHurricanes09 07:51 PM GMT del 18 Luglio 2010    
Quoting StormW:


It's not even smart thinking...it's called analysis in meteorology.
Yep, makes sense.
Member Since: Settembre 2, 2009 Posts: 129 Comments: 20011
747. TexasHurricane 07:51 PM GMT del 18 Luglio 2010    
Quoting homelesswanderer:


Nevermind. SmileyCentral.com


Hi Homeless - I see the smiley faces are back... :)
Member Since: Luglio 2, 2009 Posts: 0 Comments: 2811
748. spathy 07:51 PM GMT del 18 Luglio 2010    
Quoting BradentonBrew:
But it gets kinda old and redundant when I post data for folks that indicate certain things, and folks don't look closely at the info.

As a newbie, I hope you don't leave. But I would like to point out that the strictly posting of data without explanation makes things really difficult on us newbies.

Case in point: "....and the behavior of the MJO in the past 2 months. And if it does, it may be short lived, and the MJO could jump back to the Octants in our area."

People like me go, "Huh, MJO? Octants? What is that all? I don't mean to call you out specifically. Every day, I look for meaningful posts and I could count on my hand the number of times that I get an explanation as to a map or graphic or data that is posted to go along with the said data.

So now you got ppl who just post a link to a map with no narrative, no explanation and fifty people responding, Wow! Look at all those pretty colors and numbers. A lot of us and including those that have been here for a while are left to make conclusions, often WRONG conclusions because they are left to their own devices to come up with an explanation for the data or simple maps that are posted.

And, I realize Storm that you've done a great job to explain acronyms and such on your board and you are certainly the exception and have offered us Florida natives up to your place for better learning. However, I think if the knowledgeable ones around here would take just a moment or two and explain the data or maps that they are posting, it would go a long way in having the community avoid having 50 different interpretations of the data and the poster from saying, "Why don't you look at the data?"

Maybe somebody with time on their hands could develop a simple powerpoint as to explaining the maps and data formats that are out there?

Trust me, Storm. There are several impressionable people out here that are getting several incorrect interpretatons of the data and maps from other posters simply because the original poster just gives a link and no corresponding narrative.

Respectfully,
LCB (Bradenton, FL)


Thats why I find myself going back to Storms blog and looking at his list of NAOs,SSTs,
Acronyms.
Member Since: Giugno 8, 2008 Posts: 65 Comments: 10529

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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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