Dr. Jeff Masters' WunderBlog

Tropical wave bringing heavy rain to northern Lesser Antilles
Posted by: Dr. Jeff Masters, 13:57 GMT le 18 juillet 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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151. AussieStorm 16:02 GMT le 18 juillet 2010    
Quoting GeoffreyWPB:
000
NOUS42 KNHC 181515
WEATHER RECONNAISSANCE FLIGHTS
CARCAH, NATIONAL HURRICANE CENTER, MIAMI, FL.
1115 AM EDT SUN 18 JULY 2010
SUBJECT: TROPICAL CYCLONE PLAN OF THE DAY (TCPOD)
VALID 19/1100Z TO 20/1100Z JULY 2010
TCPOD NUMBER.....10-048

I. ATLANTIC REQUIREMENTS
1. NEGATIVE RECONNAISSANCE REQUIREMENTS.
2. SUCCEEDING DAY OUTLOOK: POSSIBLE LOW LEVEL
INVEST NEAR 21.0N 71.5W AT 20/1800Z. BEGIN
6-HRLY FIXES AT 21/0600Z IF SYSTEM DEVELOPS.

That's the main thing i get from this.
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153. mcluvincane 16:04 GMT le 18 juillet 2010    
Someone posted that mjo forecast the other day and stormw disagreed
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154. pottery 16:07 GMT le 18 juillet 2010    
Quoting AussieStorm:

That's the main thing i get from this.

Yer up late, Aussie..
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155. weathermanwannabe 16:07 GMT le 18 juillet 2010    
Quoting mcluvincane:
Someone posted that mjo forecast the other day and stormw disagreed


But Storm also mentioned yesterday that he thought that something might pop in the Caribbean in the next 5 days......
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156. JRRP 16:07 GMT le 18 juillet 2010    

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157. CybrTeddy 16:07 GMT le 18 juillet 2010    
Quoting IKE:
Oh my....



Less pronounced than yesterday, had pink in the MJO and upward MJO sticks around just off Africa, which would be good for CV development, lots of upward motion over Africa.
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158. stormwatcherCI 16:08 GMT le 18 juillet 2010    
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159. scott39 16:08 GMT le 18 juillet 2010    
What is going to stop this wave from developing after the wind shear dies down?
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160. all4hurricanes 16:09 GMT le 18 juillet 2010    
I want your dissipation, your vertical shear
I want the sky's over your center to be clear
I want your dust
Dust dust dust I want your dust
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161. earthlydragonfly 16:10 GMT le 18 juillet 2010    
Quoting scott39:
What is going to stop this wave from developing after the wind shear dies down?


The mountains on the islands.. Perhaps
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163. scott39 16:11 GMT le 18 juillet 2010    
Quoting earthlydragonfly:


The mountains on the islands.. Perhaps
It sounds like its not headed over the mountains.
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164. blsealevel 16:11 GMT le 18 juillet 2010    
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165. mcluvincane 16:11 GMT le 18 juillet 2010    
Quoting scott39:
What is going to stop this wave from developing after the wind shear dies down?


Nothing but ideal conditions
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166. blsealevel 16:13 GMT le 18 juillet 2010    
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167. scott39 16:13 GMT le 18 juillet 2010    
Quoting AussieStorm:

That's the main thing i get from this.
So were getting closer to an Invest?
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168. AussieStorm 16:14 GMT le 18 juillet 2010    
Quoting pottery:

Yer up late, Aussie..

Yeah, not feeling the best, to forget about how i am feeling,,, I am here.
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169. earthlydragonfly 16:14 GMT le 18 juillet 2010    
Quoting scott39:
It sounds like its not headed over the mountains.


Which wave are we talking about?
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170. Dakster 16:15 GMT le 18 juillet 2010    
Quoting gordydunnot:
Dakster he got you to raise your offer by a magnitude of 30 do that again and Pat might be able to buy the saints and give all his underground buddies sky box season tickets oops almost forgot free beer.


so .30?
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171. AllStar17 16:16 GMT le 18 juillet 2010    
Don't let this area of low pressure emerging off the African coast sneak up on you:

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172. AussieStorm 16:16 GMT le 18 juillet 2010    
Quoting scott39:
So were getting closer to an Invest?

Yes, will be an area to watch.
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174. mcluvincane 16:18 GMT le 18 juillet 2010    
Quoting AllStar17:
Don't let this area of low pressure emerging off the African coast sneak up on you:



Very nice indeed
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175. scott39 16:19 GMT le 18 juillet 2010    
Quoting earthlydragonfly:


Which wave are we talking about?
The AOI the NHC has marked, It looks like its going to go towards the Bahamas. This wouldnt disrupt it, and then it looks like its going S of FL. or right over the S tip and into the GOM.
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176. IKE 16:19 GMT le 18 juillet 2010    
Neither the operational GFS or parallel GFS develop the wave/blob, that's headed for Puerto Rico.

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177. AussieStorm 16:19 GMT le 18 juillet 2010    
Quoting AllStar17:
Don't let this area of low pressure emerging off the African coast sneak up on you:


I have my eye on it.

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178. blsealevel 16:20 GMT le 18 juillet 2010    


ts for tx?
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179. TankHead93 16:20 GMT le 18 juillet 2010    
Quoting IKE:


Downward MJO coming... more pronounced since yesterday. Looks legit this time.
NOT HAPPENING, sorry.
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180. TexasHurricane 16:21 GMT le 18 juillet 2010    
Are there any models suggesting this?

Channel 12 - Beaumont,TX

The tropical disturbance will have to be monitored very closely for possible cyclone formation as it enters the gulf and threatens Texas by Wed./Thu.
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181. leo305 16:21 GMT le 18 juillet 2010    
Quoting all4hurricanes:
I want your dissipation, your vertical shear
I want the sky's over your center to be clear
I want your dust
Dust dust dust I want your dust


so you want a hurricane's bad romance is what you're trying to say?
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182. IKE 16:22 GMT le 18 juillet 2010    
Quoting TankHead93:
NOT HAPPENING, sorry.


Sorry...it looks like it is.


Quoting TexasHurricane:
Are there any models suggesting this?

Channel 12 - Beaumont,TX

The tropical disturbance will have to be monitored very closely for possible cyclone formation as it enters the gulf and threatens Texas by Wed./Thu.


I don't see any development from any reliable model heading for Texas.
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183. mcluvincane 16:23 GMT le 18 juillet 2010    
Quoting IKE:
Neither the operational GFS or parallel GFS develop the wave/blob, that's headed for Puerto Rico.



Noted...but looking at sat views I think the models are out to lunch so to speak IMO. I never put a lot of stock in the models versus real time conditions.
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184. weathermanwannabe 16:24 GMT le 18 juillet 2010    
Quoting AllStar17:
Don't let this area of low pressure emerging off the African coast sneak up on you:



Thats the one I was waiting for........Need to keep a BIG eye (see Aussie post below) on that one in around 6-7 days.
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185. scott39 16:25 GMT le 18 juillet 2010    
How did the models do with Katrina when it was Approaching the FL. SE Coast in 2005?
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186. BahaHurican 16:25 GMT le 18 juillet 2010    


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187. leo305 16:25 GMT le 18 juillet 2010    
The wave over the northern antilles needs to move a bit more northward if it wants to miss those islands, and even if it does, the shear may hamper it..

so it's almost in a lose lose situation..

The area of convection that is garnering up my interest is the one south of Haiti.
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188. all4hurricanes 16:25 GMT le 18 juillet 2010    
Quoting leo305:


so you want a hurricane's bad romance is what you're trying to say?

"caught in a bad invest" so yes
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189. Drakoen 16:26 GMT le 18 juillet 2010    
GFS MJO forecast, while still downward, is not as pronounced as it has been forecasting over the past couple of days; earlier graphics showed deep reds and pinks indicative of an absolute downward MJO.
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190. JRRP 16:26 GMT le 18 juillet 2010    
Wind Shear
24hr

36hr

48hr
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191. BahaHurican 16:26 GMT le 18 juillet 2010    
Quoting scott39:
How did the models do with Katrina when it was Approaching the FL. SE Coast in 2005?
My instinct is that model performance pre-2005 is a different ball game from model performance post-2005.
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192. tropicaltank 16:27 GMT le 18 juillet 2010    
Quoting scott39:
How did the models do with Katrina when it was Approaching the FL. SE Coast in 2005?
Terrible.
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193. gordydunnot 16:27 GMT le 18 juillet 2010    
Can not see it on pressure charts but looks like ull in the Bahamas maybe filling in a little or pushing slightly to the north if so could spell trouble.
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195. Kristina40 16:28 GMT le 18 juillet 2010    
I remember the models having Katrina coming straight for us in Panama City early on.
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196. IKE 16:29 GMT le 18 juillet 2010    
17th....




Today....

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197. hunkerdown 16:29 GMT le 18 juillet 2010    
Quoting btwntx08:

lied....going into the list goodbye
one of the many facades of...
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198. BahaHurican 16:29 GMT le 18 juillet 2010    
Quoting tropicaltank:
Terrible.
Can we actually check verifications on that? I'm curious now.
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199. HurricaneSwirl 16:30 GMT le 18 juillet 2010    
Quoting scott39:
How did the models do with Katrina when it was Approaching the FL. SE Coast in 2005?


Forecast Verification
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200. scott39 16:31 GMT le 18 juillet 2010    
I believe the reason that the NHC is putting "Although" after 48 hours, is because they expect the % to go above 10. IMO
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201. BahaHurican 16:31 GMT le 18 juillet 2010    
Quoting Kristina40:
I remember the models having Katrina coming straight for us in Panama City early on.
I think maybe he was thinking more about the cyclogenesis over the Bahamas rather than on the GOM side....
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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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