Dr. Jeff Masters' WunderBlog

Tropical wave bringing heavy rain to northern Lesser Antilles
Posted by: Dr. Jeff Masters, 1:57 PM GMT on July 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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1601. extreme236 2:38 AM GMT on July 19, 2010    
Quoting MiamiHurricanes09:
It did however go a little more aggressive with the tropical wave over the Antilles.


Yeah I think so too. But, whatever it's just the NAM. I don't take it overly serious, just another thing to look at while I wait for something more reliable.
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1604. JLPR2 2:39 AM GMT on July 19, 2010    
Quoting SLU:
Nice looking ball of thunderstorms SSW of the Cape Verdes but it appears to be an ITCZ disturbance. There are no signs of low level turning in the area and I suppose the disturbance would gradually fizzle out in the next day or so.


Why would it fizzle out? remember 92L, it started out as a ITCZ disturbance.
Lets see if it develops something or if it dissipates.
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1605. bappit 2:40 AM GMT on July 19, 2010    
Quoting bohonkweatherman:
How often does something form that models do not pick up on?

If it is small, like Humberto, they can (and will) miss it completely. Don't think they can exactly miss something large. It also depends on how far out in time.

Beats me.
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1606. MiamiHurricanes09 2:40 AM GMT on July 19, 2010    
Quoting extreme236:


Yeah I think so too. But, whatever it's just the NAM. I don't take it overly serious, just another thing to look at while I wait for something more reliable.
True. The tropical wave over the central Caribbean is beginning to put on a show, developing a strong area of 925mb vorticity under the deepest convection. I suspect that an area of weak low pressure may be trying to form there, if not there already.



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1608. WeatherNerdPR 2:40 AM GMT on July 19, 2010    
I'm out. See you all tomorrow morning.
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1609. tampahurricane 2:41 AM GMT on July 19, 2010    
I'm going to have to agree with MiamiHurricanes09 I think A will be the first one to form, then B right after that.
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1610. extreme236 2:42 AM GMT on July 19, 2010    
NAM now focusing the energy moreso on the EPAC...develops a storm down there on the bottom end of the wave axis.
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1611. Grothar 2:42 AM GMT on July 19, 2010    
Quoting caneswatch:


Try 3,500 miles lol


West Coast of Africa to East Coast of U.S.

Using Senegal as the reference point for the west coast of Africa and:
Fort Lauderdale, FL as the reference point for the east coast of the U.S., the distance is approximately 4,330 miles.

Next time you try to top me Canes, I'll tell your mother to hide your chocolcates. LOL Besides, I thought you said you were in Kansas?
Where've you been hiding, never come on anymore.
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1612. TropicalNonsense 2:43 AM GMT on July 19, 2010    
Quoting MiamiHurricanes09:
That image is from 5:45 UTC (1:45 AM EDT).


yes. it is the Latest Image from Ramdis Full View.

i dont think the RAMDIS full view is taken as often as the other images.

here is the link RAMDIS FULL VIEW

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1613. JLPR2 2:43 AM GMT on July 19, 2010    
Quoting MiamiHurricanes09:
True. The tropical wave over the central Caribbean is beginning to put on a show, developing a strong area of 925mb vorticity under the deepest convection. I suspect that an area of weak low pressure may be trying to form there, if not there already.





Interesting to see two vorts east of the islands, away from the were the TW is supposed to be.
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1615. JLPR2 2:44 AM GMT on July 19, 2010    
Quoting WeatherNerdPR:
I'm out. See you all tomorrow morning.


Night!
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1616. earthlydragonfly 2:45 AM GMT on July 19, 2010    
Quoting JLPR2:


Night!


You didnt say goodnight EDF... LOL
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1617. stormwatcherCI 2:45 AM GMT on July 19, 2010    
Quoting MiamiHurricanes09:
That image is from 5:45 UTC (1:45 AM EDT).
It also says July 16
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1618. caneswatch 2:45 AM GMT on July 19, 2010    
Quoting Grothar:


West Coast of Africa to East Coast of U.S.

Using Senegal as the reference point for the west coast of Africa and:
Fort Lauderdale, FL as the reference point for the east coast of the U.S., the distance is approximately 4,330 miles.

Next time you try to top me Canes, I'll tell your mother to hide your chocolcates. LOL Besides, I thought you said you were in Kansas?
Where've you been hiding, never come on anymore.


Hey, i'm the closest without going over lol. And i'm 18, nobody has or will hide anything from me, I can easily find it lol
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1619. Patrap 2:46 AM GMT on July 19, 2010    
That RAMSDIS WV Full Disk is from 16 July..
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1620. Stormchaser2007 2:47 AM GMT on July 19, 2010    
12z NAM 78 hours.

Interesting.

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1622. extreme236 2:48 AM GMT on July 19, 2010    
Quoting Stormchaser2007:
12z NAM 78 hours.

Interesting.



Starts to organize the system more than it did on the previous run.
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1623. MiamiHurricanes09 2:49 AM GMT on July 19, 2010    
Quoting Stormchaser2007:
12z NAM 78 hours.

Interesting.

Looks like a monster of anticyclonic flow.
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1624. extreme236 2:50 AM GMT on July 19, 2010    
Vorticity is rather weak and broad across much of the Caribbean at the moment. Still not a lot going on at the surface it would seem.
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1625. Stormchaser2007 2:50 AM GMT on July 19, 2010    
Quoting extreme236:


Starts to organize the system more than it did on the previous run.


It'll be interesting to see if the other models develops this feature at all.
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1627. extreme236 2:51 AM GMT on July 19, 2010    
Quoting Stormchaser2007:


It'll be interesting to see if the other models develops this feature at all.


Yes it will. I can't imagine this actually evolving into much until at least 3 days from now from what I can tell.
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1628. JLPR2 2:52 AM GMT on July 19, 2010    
Quoting btwntx08:


Vort from the E Caribbean wave moved west towards the south of PR and now a new area or 850mb vorticity is developing east of the islands, jeez, this is a very undecided wave. XD
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1629. MiamiHurricanes09 2:52 AM GMT on July 19, 2010    
Quoting extreme236:
Vorticity is rather weak and broad across much of the Caribbean at the moment. Still not a lot going on at the surface it would seem.
Not much going on with the area by the Antilles, the one in the central Caribbean is telling another story.

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1630. TropicalNonsense 2:52 AM GMT on July 19, 2010    
Quoting stormwatcherCI:
It also says July 16


READ POST 1612 ONCE MORE.
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1631. extreme236 2:53 AM GMT on July 19, 2010    
NAM at 84 hours shows an elongated disturbance in the Gulf, the Antilles system not really changing much in organization, and shows an EPAC system right near the Mexican coast.
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1632. Stormchaser2007 2:54 AM GMT on July 19, 2010    
00z Non-tropical NAM

Moderate TS in the Bahamas.



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1633. leo305 2:54 AM GMT on July 19, 2010    
Quoting Stormchaser2007:
12z NAM 78 hours.

Interesting.



monster anticyleon
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1634. JLPR2 2:54 AM GMT on July 19, 2010    


TW with low and ITCZ Disturbance to the south
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1635. extreme236 2:55 AM GMT on July 19, 2010    
Well heading off to bed early...still tired from my vacation last week. Will see if anything interesting has happened overnight in the morning. Night all.
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1636. Skyepony (Mod) 2:55 AM GMT on July 19, 2010    
WPAC is awake.. 97W is the blob to the NNE of 04W

Even a 3rd blob in the bottom left down at 5N
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1637. MiamiHurricanes09 2:56 AM GMT on July 19, 2010    
Quoting extreme236:
Well heading off to bed early...still tired from my vacation last week. Will see if anything interesting has happened overnight in the morning. Night all.
Night!
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1638. CanesfanatUT 2:57 AM GMT on July 19, 2010    
Uh Pat - are you seeing what I'm seeing? One of those cameras (I'm on BPisevil so not sure which one) just went hazy brown. It sure as hell looked like something was leaking up intermittently before it went all hazy.

Hard to tell what is going on but the scene def. changed on that one camera.
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1639. Patrap 2:57 AM GMT on July 19, 2010    
1640. Patrap 3:00 AM GMT on July 19, 2010    
BP can screw a Light bulb in at 5k down with a ROV but they cant collect some frigging bubbles ?


Give me a frigging break Mr. Suttles.


The first relief well has reached 17,864 feet, about 100 feet above and 4 feet to the side of the target area where it will break into the existing well, he said. A second relief well has reached 15,874 feet, but has been put on hold to await completion of the first well.

Suttles said workers also are sampling bubbles visible around the wellhead to assure they are not an indication of leaking of oil or natural gas or gas hydrates from the well.

He said initial tests that he did not describe indicate the bubbles are not hydrates -- a solid form of methane or natural gas formed by the combination of cold temperatures and pressures a mile below the water's surface.

But Suttles also said workers had been unsuccessful in actually capturing the bubbles, and thus additional tests must be completed to confirm that conclusion.


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1641. TropicalNonsense 3:01 AM GMT on July 19, 2010    
The Carribean area is beginning to form a better center core and
will likely show a deeper low on the next Cimms run. It definately
has a shot in the next 48 hours to develop.

but in the long run the Cape Verde System looks to be a monster
with that unbelievably huge Circulation.

carribean system now has a better defined center...




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1644. xcool 3:06 AM GMT on July 19, 2010    
hmm
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1645. SLU 3:06 AM GMT on July 19, 2010    
Quoting JLPR2:


Why would it fizzle out? remember 92L, it started out as a ITCZ disturbance.
Lets see if it develops something or if it dissipates.


It might result in a total anticlimax since it is not directly associated with the tropical wave instead it is a flare up within the ITCZ that looks very impressive. You're right, I've seen systems like this develop in the last 10 years or so but they generally tend to die away after a day or so since they are not self sustaining systems.

But as always .. this is the hurricane season and any cluster of showers over warm water needs to be watched regardless. Persistence is the key so let's keep and eye on it for the time being.
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1646. Skyepony (Mod) 3:06 AM GMT on July 19, 2010    
cloudsat of the Jamacian Blob earlier today. Heavy rain..good heights. Some of it is on the left side of this image the rest on green square 18 here.

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1647. simeon9benjamin 3:07 AM GMT on July 19, 2010    
Quoting Stormchaser2007:
12z NAM 78 hours.

Interesting.


If this happens look out south florida!
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1648. CosmicEvents 3:08 AM GMT on July 19, 2010    
Investobe97 near the Leewards has caught my eye. Where's that tutt going? Can it go North? If so, that's not good.
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1649. Ameister12 3:11 AM GMT on July 19, 2010    
Hong Kong really should watch the progress of 04W.

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1650. Skyepony (Mod) 3:14 AM GMT on July 19, 2010    
Fresh Windscat of the wave just off Africa..
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1651. Drakoen 3:18 AM GMT on July 19, 2010    
Closed low apparent in the Caribbean on ASCAT but it is southwest of the convection.

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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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