Dr. Jeff Masters' WunderBlog

A Tale of Two Invests
Posted by: Dr. Jeff Masters, 12:17 GMT le 04 juillet 2010 +2
Good morning, everybody, Dr. Rob Carver filling in for Jeff on Independence Day.

Currently, NHC is monitoring two different areas for possible tropical cyclone development. Invest 95L is about 125 miles west-southwest of the mouth of the Mississippi and it doesn't have much thunderstorm activity associated with it. Dry air from the north and strong wind shear have weakened it considerably from yesterday, and NHC believes it has a 10% chance of becoming a tropical cyclone before the feature makes landfall.

Invest 96L is in the western Caribbean sea and bears watching closely. Earlier in the morning, the convection was all on the east side of the circulation center, but thunderstorms have developed on the southwest side. According to the CIMMS wind shear analysis, 96L is on the outskirts of a low wind shear region just east of the Yucatan peninsula. It's also over warm SST's (>29 deg C), so it could intensify. NHC gives it a 20% chance of becoming a tropical cyclone in the next 48 hours. Computer models have 96L going through the Yucatan Channel then turning left and making landfall somewhere near the Rio Grande.


Fig. 1 IR satellite composite from 720AM EDT.

Next Update
My next post will be sometime Monday afternoon/evening. If the situation changes significantly before then, I'll make a new post. In any event, enjoy the holidays...
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1951. TampaSpin 23:37 GMT le 04 juillet 2010    


Member Since: 2 septembre 2007 Posts: 175 Comments: 19747
1952. HurricaneSwirl 23:38 GMT le 04 juillet 2010    
WOW yellow, yellow, yellow, orange
Member Since: 7 juillet 2008 Posts: 2 Comments: 3237
1953. Drakoen 23:38 GMT le 04 juillet 2010    
NHC notes there is not closed surface circulation with 96L at this time
Member Since: 28 octobre 2006 Posts: 57 Comments: 29010
1954. BahaHurican 23:38 GMT le 04 juillet 2010    
Member Since: 25 octobre 2005 Posts: 19 Comments: 17588
1955. futuremet 23:38 GMT le 04 juillet 2010    
Quoting Weather456:
Nice structure



This could very well become a tropical depression tomorrow.
Member Since: 19 juillet 2008 Posts: 43 Comments: 4049
1956. JRRP 23:38 GMT le 04 juillet 2010    
Quoting AllStar17:
4 CIRCLES!

looks like August
Member Since: 16 août 2007 Posts: 0 Comments: 4298
1957. Tazmanian 23:39 GMT le 04 juillet 2010    
hey doc come back
Member Since: 21 mai 2006 Posts: 5088 Comments: 111306
1958. SiestaCpl 23:39 GMT le 04 juillet 2010    
Quoting AllStar17:
EPAC has gone dead silent.


That is interesting to note as when the EPAC goes quiet we will find elevated activity for the rest of the season in the Atlantic as climatology warms...
Member Since: 26 juin 2008 Posts: 0 Comments: 326
1959. weather42009 23:39 GMT le 04 juillet 2010    
Good call 456 and others!
1960. Torgen 23:39 GMT le 04 juillet 2010    
Quoting SiestaCpl:


Not right mind here..or left mind...just and Indian..and when they crawl into the wrong place best to move them out in a friendly way and wish them well....besides they don't bit much...


Black snakes are awesome! They eat pests, and are beautiful. I haven't seen the one that lives in the vines outside my home office this year, wondering if the hawk in my avatar got him.
Member Since: 3 juin 2010 Posts: 0 Comments: 321
1961. Drakoen 23:39 GMT le 04 juillet 2010    
Quoting Weather456:
Nice structure



Looks to be around 16.9N 82W based on that
Member Since: 28 octobre 2006 Posts: 57 Comments: 29010
1962. HurricaneSwirl 23:39 GMT le 04 juillet 2010    
Quoting MiamiHurricanes09:
I have never seen 4 circles. Wow. LOL!


I guess you weren't here for years such as 2005 and 2008, and well, pretty much any year other than 09 and 06. lol
Member Since: 7 juillet 2008 Posts: 2 Comments: 3237
1963. helove2trac 23:39 GMT le 04 juillet 2010    
what is the time frame for 96l to get into the gulf of mexico
1964. JRRP 23:39 GMT le 04 juillet 2010    
Member Since: 16 août 2007 Posts: 0 Comments: 4298
1965. HurricaneSwirl 23:40 GMT le 04 juillet 2010    
Quoting Drakoen:
NHC notes there is not closed surface circulation with 96L at this time


Yeah I saw that, it's probably the only reason why it's not at code red/TD status yet.
Member Since: 7 juillet 2008 Posts: 2 Comments: 3237
1966. TexasHurricane 23:40 GMT le 04 juillet 2010    
I see they up'd 96L to 50% chance of developing...
Member Since: 2 juillet 2009 Posts: 0 Comments: 2811
1967. MiamiHurricanes09 23:40 GMT le 04 juillet 2010    
Quoting HurricaneSwirl:


I guess you weren't here for years such as 2005 and 2008, and well, pretty much any year other than 09 and 06. lol
I wasn't. LOL.
Member Since: 2 septembre 2009 Posts: 129 Comments: 19976
1968. Tazmanian 23:40 GMT le 04 juillet 2010    
looks like will see 97L 98L
Member Since: 21 mai 2006 Posts: 5088 Comments: 111306
1969. Claudette1234 23:40 GMT le 04 juillet 2010    
2. A VIGOROUS TROPICAL DISTURBANCE LOCATED OVER THE NORTHWESTERN
CARIBBEAN SEA IS BECOMING BETTER ORGANIZED. ALTHOUGH THERE DOES NOT
APPEAR TO BE A CLOSED SURFACE CIRCULATION AT THIS TIME...NEARBY
SHIP AND BUOY OBSERVATIONS INDICATED WINDS OF TROPICAL-STORM-FORCE
BRIEFLY OCCURRED IN ASSOCIATION WITH THIS SYSTEM DURING THE PAST
FEW HOURS. ENVIRONMENTAL CONDITIONS ARE CONDUCIVE FOR DEVELOPMENT
OF THIS DISTURBANCE AS IT MOVES GENERALLY WEST-NORTHWESTWARD AT 10
TO 15 MPH...AND A TROPICAL DEPRESSION COULD DEVELOP DURING THE NEXT
COUPLE OF DAYS. THERE IS A MEDIUM CHANCE...50 PERCENT...OF THIS
SYSTEM BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS.
LOCALLY HEAVY RAINFALL AND STRONG GUSTY WINDS WILL BE POSSIBLE OVER
GRAND CAYMAN ISLAND AND MUCH OF THE NORTHWESTERN CARIBBEAN SEA OVER
THE NEXT DAY OR SO.
Member Since: 21 juillet 2009 Posts: 0 Comments: 549
1970. LADobeLady 23:40 GMT le 04 juillet 2010    
Who in the heck opened up the tropical wave door? I'm going on vacation next week, this is not acceptable!
Member Since: 29 juillet 2005 Posts: 21 Comments: 794
1971. Cavin Rawlins 23:40 GMT le 04 juillet 2010    
The circles reflect the image below from this morning's update

Member Since: 24 juillet 2005 Posts: 407 Comments: 19076
1972. Patrap 23:40 GMT le 04 juillet 2010    
Wv

Member Since: 3 juillet 2005 Posts: 370 Comments: 111244
1973. MiamiHurricanes09 23:41 GMT le 04 juillet 2010    
Oh man... Here comes 95L, 96L, 97L, 98L. LOL, I told ya' this mornin'.
Member Since: 2 septembre 2009 Posts: 129 Comments: 19976
1974. TexasHurricane 23:41 GMT le 04 juillet 2010    
Quoting HurricaneSwirl:
WOW yellow, yellow, yellow, orange


what? I only see 2 circles. Yellow and orange.
Member Since: 2 juillet 2009 Posts: 0 Comments: 2811
1975. Tazmanian 23:41 GMT le 04 juillet 2010    
hmmm i dont think we where going too see 4
Member Since: 21 mai 2006 Posts: 5088 Comments: 111306
1976. tropicfreak 23:41 GMT le 04 juillet 2010    
000
ABNT20 KNHC 042335
TWOAT
TROPICAL WEATHER OUTLOOK
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
800 PM EDT SUN JUL 4 2010

FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...

A SMALL BUT WELL ORGANIZED LOW PRESSURE SYSTEM IS LOCATED ABOUT 125
MILES SOUTH-SOUTHEAST OF THE CENTRAL LOUISIANA COAST. THIS LOW IS
EXPECTED TO MOVE NORTHWARD AT 5 TO 10 MPH OVER THE NEXT 12 HOURS OR
SO...THEN TURN NORTHWESTWARD AFTER THAT. ENVIRONMENTAL CONDITIONS
ARE ONLY MARGINALLY CONDUCIVE FOR DEVELOPMENT...AND THERE IS A LOW
CHANCE...20 PERCENT...OF THIS SYSTEM BECOMING A TROPICAL CYCLONE
BEFORE IT MOVES INLAND BY MONDAY EVENING.

A VIGOROUS TROPICAL DISTURBANCE LOCATED OVER THE NORTHWESTERN
CARIBBEAN SEA IS BECOMING BETTER ORGANIZED. ALTHOUGH THERE DOES NOT
APPEAR TO BE A CLOSED SURFACE CIRCULATION AT THIS TIME...NEARBY
SHIP AND BUOY OBSERVATIONS INDICATED WINDS OF TROPICAL-STORM-FORCE
BRIEFLY OCCURRED IN ASSOCIATION WITH THIS SYSTEM DURING THE PAST
FEW HOURS. ENVIRONMENTAL CONDITIONS ARE CONDUCIVE FOR DEVELOPMENT
OF THIS DISTURBANCE AS IT MOVES GENERALLY WEST-NORTHWESTWARD AT 10
TO 15 MPH...AND A TROPICAL DEPRESSION COULD DEVELOP DURING THE NEXT
COUPLE OF DAYS. THERE IS A MEDIUM CHANCE...50 PERCENT...OF THIS
SYSTEM BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS.
LOCALLY HEAVY RAINFALL AND STRONG GUSTY WINDS WILL BE POSSIBLE OVER
GRAND CAYMAN ISLAND AND MUCH OF THE NORTHWESTERN CARIBBEAN SEA OVER
THE NEXT DAY OR SO.

A BROAD TROUGH OF LOW PRESSURE LOCATED ABOUT 150 MILES NORTHEAST OF
THE BAHAMAS IS PRODUCING A LARGE AREA OF CLOUDINESS AND SHOWERS.
THIS SYSTEM IS CURRENTLY MOVING EASTWARD AT 10 TO 15 MPH...BUT IS
EXPECTED TO GRADUALLY SLOW DOWN AND POSSIBLY BECOME STATIONARY EAST
OF THE BAHAMAS. UPPER-LEVEL WINDS ARE ONLY MARGINALLY CONDUCIVE FOR
DEVELOPMENT AND THERE IS A LOW CHANCE...10 PERCENT...OF THIS SYSTEM
BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS.

AN AREA OF DISTURBED WEATHER APPROACHING THE LESSER ANTILLES WILL
BRING LOCALLY HEAVY RAINFALL AND GUSTY WINDS TO THE LEEWARD AND
NORTHERN WINDWARD ISLANDS...THE VIRGIN ISLANDS...AND PUERTO RICO
DURING THE NEXT COUPLE OF DAYS. ENVIRONMENTAL CONDITIONS COULD
ALLOW FOR SOME SLOW DEVELOPMENT OF THIS DISTURBANCE AS IT MOVES
WEST-NORTHWESTWARD AT ABOUT 15 MPH. THERE IS A LOW CHANCE...20
PERCENT...OF THIS SYSTEM BECOMING A TROPICAL CYCLONE DURING THE
NEXT 48 HOURS.

ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE
NEXT 48 HOURS.

$$
FORECASTER CANGIALOSI/STEWART


Looks like they upped up 96L to 50%, just as I suspected. They also upped 95L to 20%.
Member Since: 2 septembre 2006 Posts: 110 Comments: 6564
1977. Patrap 23:42 GMT le 04 juillet 2010    
96L working the swirl at the Mid Levels.
the surface will follow suit next 12most likely.

Member Since: 3 juillet 2005 Posts: 370 Comments: 111244
1978. Greyelf 23:42 GMT le 04 juillet 2010    
WABC reporting Terminal 1 at JFK evacuated due to "a threat of some kind". Link
Member Since: 5 juin 2007 Posts: 18 Comments: 838
1979. SiestaCpl 23:42 GMT le 04 juillet 2010    
Quoting Weather456:
Nice structure



Perhaps the surface level close low isn't so very far away..10 minutes I'd guess..
Member Since: 26 juin 2008 Posts: 0 Comments: 326
1980. MiamiHurricanes09 23:42 GMT le 04 juillet 2010    
Quoting TexasHurricane:


what? I only see 2 circles. Yellow and orange.
It will take a couple minutes for them to come out, wait until 8:30ish.
Member Since: 2 septembre 2009 Posts: 129 Comments: 19976
1982. helove2trac 23:42 GMT le 04 juillet 2010    
show me a four circles i only seen 2 orange and yellow
1983. HurricaneSwirl 23:42 GMT le 04 juillet 2010    
97L likely soon with the Antilles wave. Maybe 98L for the Bahamas disturbance.
Member Since: 7 juillet 2008 Posts: 2 Comments: 3237
1984. Patrap 23:43 GMT le 04 juillet 2010    
Member Since: 3 juillet 2005 Posts: 370 Comments: 111244
1985. HurricaneSwirl 23:43 GMT le 04 juillet 2010    
Quoting MiamiHurricanes09:
I wasn't. LOL.


lol, well still, I haven't seen 4 at once in JULY. o_o
Member Since: 7 juillet 2008 Posts: 2 Comments: 3237
1986. bappit 23:43 GMT le 04 juillet 2010    
Quoting StormW:


Alex was blocked by a mid level ridge, not upper...and regardless of what the NHC has, it's not a wave...it's the same monsoonal, Typhoon type development.

So the first point sounds like a semantic issue. The second one is more interesting. What is supplying the vorticity for 96L? It seems a lot different from Alex in that respect. With Alex it took a long time for vorticity to develop. This one seems to have it ready made--as by a wave moving through the area.
Member Since: 18 mai 2006 Posts: 3 Comments: 4353
1987. LADobeLady 23:43 GMT le 04 juillet 2010    
Quoting Tazmanian:



JFV did it


It had to be him or Stormtop
Member Since: 29 juillet 2005 Posts: 21 Comments: 794
1988. SiestaCpl 23:43 GMT le 04 juillet 2010    
Quoting futuremet:


Right on the money!


50% and rising..well said!
Member Since: 26 juin 2008 Posts: 0 Comments: 326
1989. BahaHurican 23:43 GMT le 04 juillet 2010    
Graphics are lagging text.
Member Since: 25 octobre 2005 Posts: 19 Comments: 17588
1990. pottery 23:43 GMT le 04 juillet 2010    
Good Evening all.
A rainy one here today, humidity between high 80's and 100% with constant rain (not heavy).
Wind generally calm, and pressure now 1011.
Would not be surprised to see 97L east of the Islands tomorrow morning, tracking NW south of the high .

96L looking very impressive...

Plenty of stuff setting up in the Caribbean, Antilles, and around 95L.
We got busy, fast.

Happy July 4th!
Member Since: 24 octobre 2005 Posts: 0 Comments: 20692
1991. MiamiHurricanes09 23:44 GMT le 04 juillet 2010    
Quoting HurricaneSwirl:


lol, well still, I haven't seen 4 at once in JULY. o_o
There ya' go. Lol.
Member Since: 2 septembre 2009 Posts: 129 Comments: 19976
1992. Cavin Rawlins 23:44 GMT le 04 juillet 2010    
They started the Antilles wave at 20%
Member Since: 24 juillet 2005 Posts: 407 Comments: 19076
1993. HurricaneSwirl 23:44 GMT le 04 juillet 2010    
Quoting TexasHurricane:


what? I only see 2 circles. Yellow and orange.


The actual physical circles aren't updated on the map yet. But if you read the outlook you'll see four areas of interest. The two new ones are at 10% and 20%.
Member Since: 7 juillet 2008 Posts: 2 Comments: 3237
1994. SLU 23:45 GMT le 04 juillet 2010    


Looks like it's gonna be "a hell of a year".
Member Since: 13 juillet 2006 Posts: 11 Comments: 2846
1995. Patrap 23:45 GMT le 04 juillet 2010    
Member Since: 3 juillet 2005 Posts: 370 Comments: 111244
1996. SiestaCpl 23:45 GMT le 04 juillet 2010    
Quoting Torgen:


Black snakes are awesome! They eat pests, and are beautiful. I haven't seen the one that lives in the vines outside my home office this year, wondering if the hawk in my avatar got him.


hehehe..well it wasn't me even if my Shawnee family name a birth was Redhawk...need them to keep my garden free of unwanteds...
Member Since: 26 juin 2008 Posts: 0 Comments: 326
1997. Cavin Rawlins 23:45 GMT le 04 juillet 2010    
Its July 4 right? So 4 circles to celebrate.

BTW, happy independence to you guys in the US of A.
Member Since: 24 juillet 2005 Posts: 407 Comments: 19076
1998. TampaSpin 23:45 GMT le 04 juillet 2010    
Quoting helove2trac:
show me a four circles i only seen 2 orange and yellow


LOL!!!

Here is 4 circles i posted on my site....on 7-1-10

See where they are at now.....



Member Since: 2 septembre 2007 Posts: 175 Comments: 19747
1999. Patrap 23:46 GMT le 04 juillet 2010    
I watch the systems,,and area's,

Not the circles.

They just circles.
Member Since: 3 juillet 2005 Posts: 370 Comments: 111244
2000. Kaydalenascar 23:46 GMT le 04 juillet 2010    
Quoting LADobeLady:
Who in the heck opened up the tropical wave door? I'm going on vacation next week, this is not acceptable!


Me too. To the western tip of Galveston island. Grrrr
Member Since: 27 juin 2010 Posts: 0 Comments: 13
2001. Tazmanian 23:46 GMT le 04 juillet 2010    
so is it %20 now that we see 97L?
Member Since: 21 mai 2006 Posts: 5088 Comments: 111306

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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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