MikeCAdministrator
(Admin)
Fri Aug 06 2010 06:42 AM
TD Colin Almost History - Invest 94L Forms Off Florida East Coast

Update - Sunday - August 8, 2010 - 11AM EDT
With a center that has elongated and a poor convective structure, Colin has been downgraded to a Tropical Depression. At 11AM Colin was almost due west of Bermuda and heading north at 10 knots with maximum sustained winds of 35mph. Highest winds observed on Bermuda were sustained at 30mph a couple of hours ago and the sea level pressure has been rising at Bermuda since 5AM EDT. Colin is likely to become an open wave long before it gets absorbed by a trough off the east coast.

Invest 93L in the Central Atlantic still has fairly good structure but only a small area of convection to its north and east. At 08/15Z the system was located at 22.9N 44.7W and it was moving to the west northwest to northwest at 11 knots. The chances for additional development are good, however the process will be slow given the diminishing SAL area that it is moving through.

A new system, Invest 94L, was located off the Florida east coast near 30.3N 78.6W at 08/12Z. The system is expected to move generally westward across the peninsula and into the northern Gulf of Mexico in a couple of days. Sustained winds initially set at 25 knots and pressure is 1011MB.

Yet another wave, with minimal convection at the moment, was located in the eastern Caribbean Sea near 13.5N 65W at 08/16Z. This system has the potential for some future development as it moves to the west. Windshear is quite light across the eastern and central Caribbean Sea.
ED

{{NortheastGulfRadar}}
{{EastFloridaRadar}}

{{StormLinks|93L|93|5|2010|3|93L}}
{{StormLinks|94L|94|6|2010|1|94L}}
{{StormCarib}}

Update - Saturday - August 7, 2010 - 11AM EDT
Although the wind shear has decreased considerably, for a tropical storm Colin is a disorganized mess. The center of the minimal TS is exposed again with all of the unstructured convection displaced to the east and southeast. Colin has unexpectedly become stationary - stuck in an area of negligible winds (a COL area) between two upper level lows.

With a trough amplifying over the southeastern U.S., increasing southwesterly winds should eventually shove Colin off to the northeast. With less wind shear to contend with for the next 18 to 24 hours, some modest improvement in structure and increase in intensity is still possible - so a Tropical Storm Warning remains in effect for Bermuda.
ED

Original Post
Tropical Storm Colin looks more ragged this morning and may not hold Tropical Storm status long, the center is separate from the convection again, as it moves rapidly northwest. It is expected to miss Bermuda to the west, so that the island will see some effects from the storm.

Current Weather at Hamilton, Bermuda

Colin will likely then head toward the northeast as an extratropical system, perhaps clipping far eastern Newfoundland in Canada.

The area in the East Atlantic atlantic is being pushed northward and will likely stay well out to sea, if it develops it likely won't last long.

Beyond that there is nothing else, 92L is no longer being tracked. Anything else may not come until mid to late next week.
Bermuda Radar


MichaelA
(Weather Analyst)
Fri Aug 06 2010 08:21 AM
Re: Colin Barely Still Around

Colin is heavily sheared this AM, but the shear and froward speed are forecast to abate somewhat in the next 24 hours according to the NHC. Either Colin is doing a substantial wobble/loop, or the LLC is trying to move back under the convection to its east this AM, since the LLC is showing a due East movement in the latest loops.

WesnWylie
(Weather Guru)
Fri Aug 06 2010 10:19 AM
Re: Colin Barely Still Around

The NHC has 92L back up on their satellite page. It is looking healthier this morning. I was looking at the forecast charts, and regardless of development, it would likely move into Central/Northeast Mexico.

Fairhopian
(Weather Watcher)
Fri Aug 06 2010 04:13 PM
92L Still Persisting

I am still hoping someone smarter than me will entertain my question from yesterday morning:

"92L does have convection this morning and its upper level clouds appear to be somewhat aligned with its shallow clouds. Will the impending encounter with the upper ridge (to its immediate West) likely affect 92L's steering or rate of development? Watching what appears to be the "belt buckle" of 92L at 15N, 80W (I'm a former defensive back), its movement appears to be a little more north of due west in the last few frames. What does an upper ridge typically do to a tropical low crossing under it?"

While today's Tropical Discussion denotes a cyclonic turning in the NW Caribbean, the same thing was happening yesterday, though more attention was on Colin. Also, today's Tropical Discussion mentions how there is a lot of moisture in the upper levels of the NW Caribbean, and the base of the upper level ridge is causing a light easterly wind. I am curious about the interplay of 92L and that ridge. Any takers? Thanks.


danielwAdministrator
(Moderator)
Fri Aug 06 2010 04:35 PM
Re: 92L Still Persisting

I'll try. A ridge would be akin to a linebacker line. Nothing would get through. It would probably deflect to the west as you posted the winds are light easterly winds.

I just checked the Western Caribbean buoys and while they are reflecting a pressure drop the winds aren't above 20 mph at this time. Pressure drop could be a diurnal/ twice daily pressure drop.

http://www.ssd.noaa.gov/goes/east/watl/wv-l.jpg

http://www.ssd.noaa.gov/goes/east/watl/loop-wv.html

ULL, upper level low in the BOC, Bay of Campeche, could draw 92L a bit further north. ( The Fujiwara Effect) .
I'm still trying to make some sense of all of the ULLs between Colin and 92L. If it help the models, several days ago, were forecasting 92L to track over the Yucatan Peninsula and into NE Mexico near Veracruz./ Tampico.

OFFSHORE WATERS FORECAST FOR THE GULF OF MEXICO
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1030 AM CDT FRI AUG 06 2010


GMZ089-062130-
SYNOPSIS FOR THE GULF OF MEXICO
1030 AM CDT FRI AUG 06 2010

.SYNOPSIS...RIDGE ALONG 29N DRIFT S AS WEAK FRONTAL TROUGH
PUSHES S INTO FAR NE WATERS. TROPICAL WAVE MOVE THROUGH BAY OF
CAMPECHE SUN AND MON. A WEAK LOW PRES SYSTEM WILL DEVELOP IN THE
NE GULF MON AND LINGER TUE.


stormtiger
(Weather Hobbyist)
Fri Aug 06 2010 05:25 PM
Re: 92L Still Persisting

It looks like conditions for 92L are becoming more favorable, but it is nearing land.

Something would have to start happening fast for 92L to develop before hitting land.

We have an ULL over the BOC?Western GOM and it doesn't seem to be in much of a hurry to get out of the way. Dry air is prevalent to the East of 92L, but 92L has blossomed somewaht today in a favorable are in the W Carribean. A ridge is present there, and conditions appear fine; but the TS activity isn't that great, yet.

There does seem to be some cyclonic twisting indicated on the visible satellite loops.

I think the likelehood of something developing is improving, but not to the "orange" level yet.


WesnWylie
(Weather Guru)
Fri Aug 06 2010 06:28 PM
Re: 92L Still Persisting

I think I see a spin in 92L around 84*W;18*N. I don't know if this is a mid-level or a low-level. The models show the center west-southwest of there. If the center is further north then the track would see a northward shift too. It really is looking healthy out there, though.

berrywr
(Weather Analyst)
Fri Aug 06 2010 08:23 PM
Re: 92L Still Persisting

Okay, let's address a couple of features going on with 92L this evening. 92L looks pretty good on satellite imagery and looked even better not too long ago; a comment I posted about the NHC not even make a mere mention of it until 5 pm today.

92L is approaching land and there is very little opportunity for 92L to be upgraded and not likely until it re-emerges in the Bay of Campeche in a couple of days; maybe 3.

A couple of features; there is an upper low in the Bay of Campeche, an upper ridge over 92L and an area of 20 knot shear aloft ahead of the system but otherwise light shear dominates the area over and ahead into the Western GOM.

A couple of things worth mentioning....upper ridges over tropical systems are what you want for tropical systems to develop into storms; because there is an upper ridge over a shallow system the interaction between the two is not of that between an upper ridge and a hurricane.

The Upper Level Low to the NW of 92L will have no Fujiwara; 92L is simply too shallow to be steered by the Upper Level Low in this fashion. There is minimum gradience between this ULL and the ridge over 92L to have any degree of impact until 92L becomes much more organized. A Fujiwara is akin to two identical magnetic charges facing one another and repelling each other; that simply is not the case here/

This system will have to be monitored onces it emerges back in the BOC as some models have a break in the two ridges over the US and Atlantic Ocean and it will be interesting to see if it will interact with the evolving long wave trough pattern setting up over the Eastern US. There is a sagging front in the SE USA that will have to be monitored if it enters the GOM and goes stationary.

I commend the thinking and comments on this system...good work all!


Ed DunhamAdministrator
(Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017))
Fri Aug 06 2010 09:02 PM
Re: 92L Still Persisting

Given the question that was asked, danielw's analog is still a good one, since there is also quite a difference between the (usually rather small) anticyclone created by a mature hurricane (to the right of its movement in the Northern Hemisphere) and a synoptic scale upper level blocking ridge.

One more correction - From the NHC Glossary:

" Fujiwhara Effect:
The tendency of two nearby tropical cyclones to rotate cyclonically about each other. "

Their is no Fujiwhara effect when one of the systems is an upper level low - however, the ULL can contribute to the motion of a tropical cyclone.
ED


danielwAdministrator
(Moderator)
Sat Aug 07 2010 06:53 AM
Re: 92L Still Persisting

Thanks, Guys.
I hadn't though of surface lows and upper level lows not being effected by Fujiwhara. Different levels in the atmosphere. Learn something here everyday.


SE tail of the 93L thumbnail looks like a good area to watch today.


mwillis
(Weather Hobbyist)
Sat Aug 07 2010 01:34 PM
Re: 92L Still Persisting

It appears the the coc moved a little to the ese in the last couple of frames. That is unless im seeing this incorrectly, lol

http://www.ssd.noaa.gov/goes/flt/t1/flash-vis.html


berrywr
(Weather Analyst)
Sat Aug 07 2010 07:00 PM
Re: 92L Still Persisting

Don't be afraid to ask us; that's what were here to do and at the same time don't feel as if we're ever putting each of you down if you're wrong; you'd be amazed how often we're wrong or what we think is going to happen and it doesn't. Look at Colin this evening; amazing thing happened today; the center and convection are now together and looking quite well on satellite imagery this evening. Though it's days are now measured before becoming a garden variety cold core low and eventually absorbed into a bigger low...that's what its all about. Keep asking and we'll keep answering; yall have a nice evening.

danielwAdministrator
(Moderator)
Sun Aug 08 2010 11:03 AM
Re: 92L Still Persisting

Excerpts from various NWS Morning Forecast Discussions:

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
248 AM CDT SUN AUG 8 2010

MODELING CONTINUES TO DEVELOP AN INVERTED TROUGH ALOFT WITH A BROAD
AREA OF SURFACE LOW PRESSURE OVER THE NORTHERN BAHAMAS ON LATER
TODAY OR TOMORROW THAT MOVES WEST INTO THE GULF OF MEXICO OFFSHORE
OF SOUTHWEST FLORIDA ON TUESDAY THEN TRACKS NORTHWEST TOWARDS
SOUTHEAST LOUISIANA ON WEDNESDAY. THIS AREA OF LOW PRESSURE WILL
BRING AN INCREASE IN SHOWERS AND THUNDERSTORMS BEGINNING ON
WEDNESDAY WITH NORTHEAST TO EAST WINDS. SHOULD THIS AREA OF LOW
PRESSURE DEVELOP AS CURRENT MODELING SUGGESTS...IT WILL BE MONITORED
CLOSELY FOR SIGNS OF FURTHER TROPICAL CYCLONE DEVELOPMENT.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MIAMI FL
418 AM EDT SUN AUG 8 2010

THERE IS GENERAL AGREEMENT IN THE MOST RECENT SUITE OF MODEL
GUIDANCE THAT THE LOW LEVEL TROUGH MENTIONED ABOVE WILL CONTINUE
TO MOVE SOUTHWEST TODAY AND TONIGHT AND COULD PASS ACROSS SOUTH AND
CENTRAL FLORIDA ON MONDAY...WITH A SURFACE LOW POSSIBLY FORMING AS
THE TROUGH DEEPENS. THIS SCENARIO CONTINUES TO MAINTAIN HIGH
CHANCES OF CONVECTION ACROSS SOUTH FLORIDA ON MONDAY. THE GUIDANCE
THEN SUGGESTS THAT THE LOW LEVEL TROUGH CONTINUES TO MOVE WEST INTO THE
EASTERN GULF ON MONDAY NIGHT INTO TUESDAY AND CONTINUES TO FORM A
SURFACE LOW...MAINTAINING VERY MOIST CONDITIONS ACROSS THE REGION
WITH A HIGH CHANCE OF CONVECTION.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOBILE AL
436 AM CDT SUN AUG 8 2010

MONDAY NIGHT WOULD BE A HARBINGER OF RELATIVELY DRY WEATHER. A
DECREASE OF WATER VAPOR AVERAGES FROM 1000-500 MB IS EXPECTED TO
COMMENCE OVER THE AREA AS CYCLOGENESIS BEGINS OVER THE OLD FRONT IN
THE NE GMEX AND THE RESULTANT LOW MOVES WEST. WE NOTE THAT THESE
TYPES OF LOWS CAN SOMETIMES ACHIEVE TROPICAL CHARACTERISTICS.
MOISTURE POOLED ALONG THE SOUTHWARD DRIFTING FRONT WILL MAINTAIN A
DEEP LAYER OF AVAILABLE WATER VAPOR, RH BEING BETWEEN 60 AND 70
PERCENT, OVER THE AREA THROUGH MONDAY. MOISTURE COMBINED WITH
INSTABILITY OFFSHORE WILL GENERATE SCATTERED SHOWERS AND
THUNDERSTORMS OVER THE GULF DURING THE MORNINGS, WITH SUNLIGHT
PROVIDING THE INSTABILITY OVER LAND TO BRING SCATTERED TO NUMEROUS
SHOWERS AND THUNDERSTORMS MONDAY. TUESDAY AFTERNOONS. AS THE
AFOREMENTIONED LOW DEVELOPS OVER THE GULF, RELATIVELY DRY AIR FROM
THE PIEDMONT REGION WILL BE DRAWN OVER THE AREA AS IT ROTATES AROUND
THE AREA OF CYCLOGENESIS ON TUESDAY.


stormchazer
(Storm Tracker)
Sun Aug 08 2010 11:05 AM
Re: 92L Still Persisting

AL 94 2010080812 BEST 0 303N 786W 25 1011 DB

Off the Florida east coast.


danielwAdministrator
(Moderator)
Sun Aug 08 2010 11:21 AM
94L off the Florida East Coast

Thanks,

CARCAH, NATIONAL HURRICANE CENTER, MIAMI, FL.
1100 AM EDT SUN 08 AUGUST 2010
SUBJECT: TROPICAL CYCLONE PLAN OF THE DAY (TCPOD)
VALID 09/1100Z TO 10/1100Z AUGUST 2010
TCPOD NUMBER.....10-070 CORRECTION

I. ATLANTIC REQUIREMENTS
1. NEGATIVE RECONNAISSANCE REQUIREMENTS.
2. OUTLOOK FOR SUCCEEDING DAY: POSSIBLE LOW LEVEL
INVEST IN E. GULF NEAR 26.5N 83.5W AT 10/1800
*********************************************
MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
820 AM EDT SUN AUG 08 2010

SIGNIFICANT CHANGES IN THE MODELS SINCE THIS TIME YESTERDAY WITH
THE LOW EXPECTED TO PINCH OFF THE FRONTAL TROUGH OVER CENTRAL
FLORIDA. THE CMC..ECMWF...AND UKMET ALL SHOW A MUCH MORE
ORGANIZED LOW PRES SYSTEM DEEPENING OVER THE EASTERN GULF MON
AND MOVING WEST-NORTHWEST TOWARD LOUISIANA BY THU COMPARED TO
THEIR RUNS THIS TIME YESTERDAY. THE GFS IS SIGNIFICANTLY WEAKER
AND FARTHER E WITH THE TRACK IN THE GULF...BUT IT HAS BEEN
SLOWLY TRENDING TOWARD THE OTHER MODELS THE LAST FEW DAYS. THE
HPC/NHC NOON MEDIUM RANGE CALL SAT CALLED FOR A COMPROMISE
BETWEEN THE ECMWF AND GFS TRACK WHICH CARRIES A TUE MORNING LOW
POSITION NEAR 29N82W AND BRIEFLY MOVES IT INTO THE FAR NE GULF
BEFORE CARRYING IT INTO THE FLORIDA PANHANDLE NEAR 30N85W WED
MORNING. THESE POINTS WERE TWEAKED TOWARD THE CONSENSUS OF THE
ECMWF...UKMET...AND CMC WHICH WERE FARTHER SOUTHWEST WITH THE
TRACK AND ALLOWED THE LOW MORE TIME OVER THE GULF WATERS.

EARLY MORNING OBSERVATIONS OVER NORTH FLORIDA SHOW A CLEAR WIND
SHIFT SUGGESTING THE PASSAGE OF A FRONTAL TROUGH. THE SATELLITE
SIGNATURE NEAR BUOY 41010 THIS MORNING SUGGESTS THERE MAY BE A
WAVE DEVELOPING ALONG THE BOUNDARY. THE MODELS SUGGEST THE
DEVELOPMENT OF A MID LEVEL LOW SOMEWHERE OVER CENTRAL FLORIDA
TONIGHT OR MON...BUT THEY ARE NOT SURE OF THE DETAILS. BY
TUE...THE UKMET...ECMWF...AND CMC COME INTO EXCELLENT AGREEMENT
ON A RETROGRADING AND DEEPENING LOW PRES SYSTEM IN THE GULF OF
MEXICO BORN FROM THE ENERGY ASSOCIATED WITH THIS FRONTAL TROUGH
WHILE THE GFS IS WEAKER AND MORE NORTHERLY WITH THE SYSTEM. THE
GFS HAS BEEN PLAYING CATCH UP HERE. GIVEN THE CURRENT SATELLITE
IMAGERY...IT APPEARS THE ECMWF HAS THE BEST HANDLE ON THE
DEVELOPMENT NEAR FLORIDA FOR NOW. PLEASE SEE THE DISCUSSION IN
THE GULF OF MEXICO SECTION FOR MORE DETAILS ON THIS SYSTEM.
(contents in the first paragraph)

http://www.srh.noaa.gov/data/NHC/MIMATS


mwillis
(Weather Hobbyist)
Sun Aug 08 2010 12:44 PM
Re: 94L off the Florida East Coast

I think i see a coc forming on radar near the letter E in Fort Pierce off the east seaboard. Does anyone else see it?

http://radar.weather.gov/radar.php?rid=MLB&product=N0Z&overlay=11101111&loop=yes


Ed DunhamAdministrator
(Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017))
Sun Aug 08 2010 12:54 PM
Re: 94L off the Florida East Coast

Satellite confirms the possibility. In developing systems its worth remembering that multiple cyclonic spinups will occur within the system. Eventually as the system evolves one center predominates.
ED


danielwAdministrator
(Moderator)
Sun Aug 08 2010 01:02 PM
Re: 94L off the Florida East Coast

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
1259 PM EDT SUN AUG 8 2010

FLZ054-059-081800-
INDIAN RIVER-ST. LUCIE-
1259 PM EDT SUN AUG 8 2010

...FUNNEL CLOUDS AND WATERSPOUTS POSSIBLE OVER SOUTHEASTERN INDIAN
RIVER COUNTY...NORTHEASTERN ST. LUCIE COUNTY...

AT 1252 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
LINE OF STORMS CAPABLE OF PRODUCING FUNNEL CLOUDS AND STRONG WIND
GUSTS UP TO 40 MPH OVER INDIAN RIVER SHORES...MOVING SOUTHEAST AT 10
MPH.

LOCATIONS IN THE PATH OF THE STORM WHICH MAY EXPERIENCE GUSTY WINDS
AND FUNNEL CLOUDS INCLUDE QUEENS COVE AND SOUTH BEACH.

WATERSPOUTS CAN MOVE ONSHORE AND PRODUCE BRIEF...SMALL TORNADOES.
MOVE INDOORS AND STAY AWAY FROM WINDOWS.


EMS
(Weather Hobbyist)
Sun Aug 08 2010 05:12 PM
Re: 94L off the Florida East Coast

Not sure, but there appears to be rotation visible from Melbourne long range radar. It was located about 100 miles due east of Melbourne and has moved just west of due south over the last 45 minutes. It is now almost due west of Fort Pierce. Could that be a developing COC?

rgd
(Weather Hobbyist)
Sun Aug 08 2010 06:05 PM
Re: 94L off the Florida East Coast

Quote:

Not sure, but there appears to be rotation visible from Melbourne long range radar. It was located about 100 miles due west of Melbourne and has moved just west of due south over the last 45 minutes. It is now almost due west of Fort Pierce. Could that be a developing COC?





Not really it is just a low that is going to move across the state and get us dryer tomorrow then maybe some backside precip on tuesday but a coc? no just a low that is bringing some much needed rain to my area that is about all this will be.


Ed DunhamAdministrator
(Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017))
Sun Aug 08 2010 06:48 PM
Re: 94L off the Florida East Coast

I think perhaps you meant to say east? There is a mid-level low off the east coast of Florida and prior to some convective buildup a weak low level center of circulation was attempting to form at 08/21Z near 27.9N 80.1W - which would be about 30 to 35 miles just south of due east of Melbourne. The mid-level system has been moving south southwest (about 210 degrees) at 7 knots all day. Early model projections move the hybrid system across the peninsula and into the northern Gulf of Mexico, however the entire trough is rather complex. At the same time today a second counterclockwise spin was noted near 26N 83.5W in the Gulf - not all that uncommon for a weak potential development area. The best early model solutions based on current and past movement appear to be the BAMD and (surprisingly) the CMC. NHC does note that when the system gets into the Gulf there is some potential for it to acquire tropical characteristics.
ED


WesnWylie
(Weather Guru)
Sun Aug 08 2010 07:21 PM
Re: 94L off the Florida East Coast

I am seeing a spin off the coast of Western Florida on the latest satellite loop: http://aviationweather.gov/adds/satellit...g&itype=vis . It is quite a ways into the GOM. I think we may have to monitor both sides of Florida as the area of convection extends across the entire region.

berrywr
(Weather Analyst)
Mon Aug 09 2010 02:17 AM
94L - 09/00Z Package

As of 09/0600Z - Surface Analysis has a frontal system with a NW-SE axis extending from AR through S MS, extreme SE LA into the GOM where a low is analyzed near 27N 86W in the convective complex in the GOM to across Central FL with a weak low pressure (94L) well offshore. This low is progged to move SW towards Daytona Beach, FL by Monday night.

Wind Shear analysis has winds north to south between 20 and 30 knots from W FL to a bullseye of 30 knot winds over the Bahamas; however very light shear near the first frontal low with convection being generated.

There is an upper level low depicted at 850 mbs over the eastern coastline of FL to the Central Bahamas at 700 mbs and 500 mbs and in the SE Bahamas at 300 mbs and higher. This entire upper level low and axis is inverted generally along a north to south axis and models move this feature west towards LA in 72 to 96 hours.

Other features - Thee is an upper level low centered over San Antonio, TX. This feature was near the Bay of Campeche a few days ago and continues to move NNW at this time. This upper low is interacting with an old frontal boundary mentioned above over TX, OK, AR.

Mid Continental upper ridge remains anchored over TX and OK with ULL beneath it. Ridge axis extends generally along 90W longitude and south to thd Yucatan.

East coast longwave trough is progressing eastward and extends to offshore NC/SC border and from there inverts into the cutoff low mentioned above.

I have doubts about 94L being tropical...at this time. The proximity of the ULL may in fact be only a surface reflection; however climatology and dying frontal systems in the GOM and Atlantic Ocean do birth tropical cyclones. There is a great deal of subsidence and dry air behind the east coast trough.

The problem I have with 94L is the ULL is forecast to travel towards LA over the next few days. While tropical cyclones can form under ULL they don't do well with a ULL riding shotgun. Shear between upper ridges and upper lows are the main concern and I would like to get a gauge on where that ULL over the Bahamas is going.

Last year the numbers were down due to a chaotic atmosphere and a gazillion TUTT lows and I'm looking at the same thing again this year.

I would be remiss if I didn't mention a kind word about Ed, I share his opinion about the atmosphere being as chaotic this year as it were last year. There are a lot of upper level lows in the Tropics once again this year and upper level lows mean gradience and thus shear.

The area I believe that bears watching is in the Gulf of Mexico right now and the frontal low on the front near 27N 86W.


doug
(Weather Analyst)
Mon Aug 09 2010 09:56 AM
Re: 94L - 09/00Z Package

Good morning, the RGB seems to indicate that a low level circulation is trying to close off in the northern Bahamas.. Presently there is cyclonic spin along a NNW-SSE elongated axis that is just off the Florida east coast. The convection is consolidated in the Bahamas through the keys and out into the GOM along the frontal trough. At the northern apex of the convection in the Bahamas, I think one can make out a closing off of the circulation. I think it will take several hours to confirm that, but otherwise the circulatiion is very elongated, and trough like. I do not see any evidence of a circulation in the central GOM, and all organizational activity, if that is what is going on, is in relation to the convection in the Bahamas. I see no reason to suspect that development would be anything other than tropical in nature, based on the climatological environment surrounding the mass of weather.

danielwAdministrator
(Moderator)
Mon Aug 09 2010 10:18 AM
Recon Plans

Noon EDT departure for the INVEST flight on Tuesday. (corrected day of week for flight.)

WEATHER RECONNAISSANCE FLIGHTS
CARCAH, NATIONAL HURRICANE CENTER, MIAMI, FL.
1000 AM EDT MON 09 AUGUST 2010
SUBJECT: TROPICAL CYCLONE PLAN OF THE DAY (TCPOD)
VALID 10/1100Z TO 11/1100Z AUGUST 2010
TCPOD NUMBER.....10-071

I. ATLANTIC REQUIREMENTS
1. SUSPECT AREA - GULF OF MEXICO
FLIGHT ONE -- TEAL 70
A. 10/1800Z
B. AFXXX 01DDA INVEST
C. 10/1600Z
D. 26.0N 84.0W
E. 10/1730 - 2200Z
F. SFC TO 10,000 FT
FLIGHT TWO -- TEAL 71
A. 11/0600Z -1200Z
B. AFXXX 0205A CYCLONE
C. 11/0430Z
D. 27.0N 85.5W
E. 11/0500 -1200Z
F. SFC TO 15,000 FT

2. OUTLOOK FOR SUCCEEDING DAY: CONTINUE 6 HRLY FIXES
IF SYSTEM DEVELOPS.

*****************************************************
MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
420 AM EDT MON AUG 09 2010
(excerpts~danielw)
MARINE WEATHER DISCUSSION FOR THE GULF OF MEXICO...CARIBBEAN SEA
AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W.

GULF OF MEXICO...
NORTHERN EXTENSION OF TROPICAL WAVE CURRENTLY ALONG 95W IN BAY
OF CAMPECHE.

LOW PRES EXPECTED TO SPIN OFF FRONTAL TROUGH OVER NORTH FLORIDA.
MODELS CONSENSUS SHOW MUCH MORE ORGANIZED SYSTEM DEEPENING OVER
EASTERN GULF MON AND MOVING W TOWARD LOUISIANA THU. GFS WEAKER
AND FARTHER E. FORECAST LEANS TOWARD COMPROMISE BETWEEN ECMWF
AND GFS TRACK WHICH BRING LOW PRES NEAR 29N82W AND MOVES IT INTO
FAR NE GULF BEFORE CARRYING IT INTO FLORIDA PANHANDLE NEAR
30N85W EARLY WED.


Jasonch
(Weather Watcher)
Mon Aug 09 2010 01:53 PM
Re: TD Colin Almost History - Invest 94L Forms Off Florida East Coast

The NHC gives 94L 30% chance of developement in the gulf of mexico but I feel that is being very generous at this time. it has along way to go and it isn't purely tropical either.

danielwAdministrator
(Moderator)
Mon Aug 09 2010 02:24 PM
Attachment
New System in the Caribbean??

Latest visible imagery indicating a lone convective system in the Mid Caribbean Sea. Rapid convective buildup. Just another area to watch off and on.

Image centered at Latitude= 14.73° N Longitude= 69.44° W (X=416 Y=298)
http://weather.msfc.nasa.gov/GOES/goeseasthurr.html

Cyclic convection over the last few hours. Appears to be in a Coll between ridges and lows... read that as no obvious shear in the area right now.

http://www.ssd.noaa.gov/goes/east/watl/wv-l.jpg
http://www.ssd.noaa.gov/goes/east/watl/loop-wv.html

See Attached WV Satellite Image 1745Z above.

8:45AM EDT


1145AM EDT



Evan Johnson
(Weather Guru)
Mon Aug 09 2010 02:31 PM
Re: New System in the Caribbean??

yeah i saw that. looks like a mini storm. nice little flare up as well on the 17:45 loop. also, what is the deal with this low? it doesnt know what its doing.

Jasonch
(Weather Watcher)
Mon Aug 09 2010 02:45 PM
Re: New System in the Caribbean??

I just noticed this area in the caribbean too. It really caught my eye as WOW, where did that come from. A very rapid blow up of convection and a very nice semetric look. It does look like a mini storm on the increase. Well just have to wait and see.

Ed DunhamAdministrator
(Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017))
Mon Aug 09 2010 02:55 PM
Re: New System in the Caribbean??

This is the same circulation that was noted yesterday in the Sunday Update to the Main Page leadoff article. Its going through another convective pulse. Its a small system, but it has managed to hold together for over 24 hours.
ED


Jasonch
(Weather Watcher)
Mon Aug 09 2010 02:57 PM
Re: New System in the Caribbean??

Quote:

This is the same circulation that was noted yesterday in the Sunday Update to the Main Page leadoff article. Its going through another convective pulse. Its a small system, but it has managed to hold together for over 24 hours.
ED


Is there any possibility for developement.

Ed DunhamAdministrator
(Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017))
Mon Aug 09 2010 03:15 PM
Admin Note

Your answer is on the Main Page leadoff article for this thread. Since we don't like to duplicate posts, just go back and read it. A kind reminder that CFHC is not a chat room, it is a Forum-oriented discussion.
ED


Fairhopian
(Weather Watcher)
Mon Aug 09 2010 03:26 PM
Re: TD Colin Almost History - Invest 94L Forms Off Florida East Coast

The broad surface low centered in the Eastern Gulf (which may never become tropical) has really been pumping out the moisture/convection in the direction of the northern extension of the tropical wave along 95W in the Bay of Campeche (f/k/a 92L). The barely detectable cyclonic feature once associated with 92L appears to be currently centered near 94W, 24N. As best I have been able to observe, the center of that feature slowed and curved a little more northward over the past day or two, since it left the Yucatan, and did not cross into Northern Mexico. In other words . . . I think there is still something there. So my question is: Could some of the moisture in the Gulf coming from the North and East wrap into former 92L and regenerate it?

Ed DunhamAdministrator
(Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017))
Mon Aug 09 2010 04:09 PM
Re: TD Colin Almost History - Invest 94L Forms Off Florida East Coast

I can't locate the system that you refer to, but in any case it would need to be much better organized than what it shows now, i.e., an influx of moisture probably wouldn't help it much. Water Vapor suggests that there is already adequate moisture throughout that area and a weak anticyclonic circulation aloft.
ED


doug
(Weather Analyst)
Mon Aug 09 2010 04:23 PM
Re: TD Colin Almost History - Invest 94L Forms Off Florida East Coast

Current radar would suggest a low center in the waters off Monroe County, 10, 000 Islands area.
Heavy rain in SE Fort myers right now.


Storm Hunter
(Veteran Storm Chaser)
Mon Aug 09 2010 05:00 PM
Attachment
Re: TD Colin Almost History - Invest 94L Forms Off Florida East Coast

think this is where 94L is located... broad and with a lot of dry air aloft above the surface reflection.

http://www.meteo.psu.edu/~gadomski/SAT_GULF/anim16vis.html

http://weather.cod.edu/analysis/loops/satmaster.pl?Florida



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