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News Talkback >> 2007 News Talkbacks

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MikeCAdministrator
Admin


Reged: Sun
Posts: 4542
Loc: Orlando, FL
July Nearing End, Tropics Waking Up
      #75942 - Sun Jul 29 2007 09:27 AM

The tropics may be waking up again, albeit a bit slowly. There is a slight chance we may have a named system or at least a depression in July. And right now the main focus is on the area northeast of the Bahamas, being referred to as investigation 98L.



This system likely will not affect any land area. It has a fairly good shot to develop into a system over the next few days or so. A recon flight may be scheduled for this afternoon (Sunday) to check it out (Edit: This flight has been canceled now). There is a chance for it to become a tropical depression within the next few days. Right now convection is still too far away from the center and isn't really organized enough to get going today, but if it persists it could develop.

If it does form, like mentioned it will likely move north and northeast avoiding land areas, (Both the US and Bermuda) entirely, so it will likely be a fish spinner type system.

Beyond that, there is not much else going on, although into August we start expanding the area we look for systems to develop. The only other outside chance is something happening in the Gulf, as shear in that area will start to weaken by the end of the week.


99L (Area East of Caribbean) Event Related Links


float4latest.gif stormplotthumb_4.gif

SFWMD Model Plot (Animated Model Plot) SFWMD Hurricane Page


[https://flhurricane.com/floatanimator.php?year=2007&storm=4 Flhurricane Satellite Floater Animation of 99L
GOES Floater
Animated Skeetobite Model Plot of 99L


Clark Evans Track Model Plot of 99L (Animated!) Model Plots in Google Earth - In Google Maps
Clark Evans Intensity Model Plot of 99L (Animated!)

Clark Evans Track Plot of 99L

Other Model Charts from Clark

Clark Evans Top 10 Analog Storms for 99L
More model runs on from RAL/Jonathan Vigh's page
NRL Info on 99L -- RAMMB Info
COD Atlantic Satellite View


98L (Area Northeast of the Bahamas) Event Related Links


float3latest.gif stormplotthumb_3.gif

SFWMD Model Plot (Animated Model Plot) SFWMD Hurricane Page


[https://flhurricane.com/floatanimator.php?year=2007&storm=3 Flhurricane Satellite Floater Animation of 98L
GOES Floater
Animated Skeetobite Model Plot of 98L


Clark Evans Track Model Plot of 98L (Animated!) Model Plots in Google Earth - In Google Maps
Clark Evans Intensity Model Plot of 98L (Animated!)

Clark Evans Track Plot of 98L

Other Model Charts from Clark

Clark Evans Top 10 Analog Storms for 98L
More model runs on from RAL/Jonathan Vigh's page
NRL Info on 98L -- RAMMB Info
COD Atlantic Satellite View


StormCarib Reports from the Caribbean Islands

Caribbean Weather Observations

Barbados Brohav Weather Fax

Full Caribbean Radar Composite

Caribbean Broadcast Corporation (TV/Radio from Antilles)

San Juan, PR NWS Page

Various Caribbean Radio Stations

DR1 Dominican Republic Hurricanes


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dem05
User


Reged: Wed
Posts: 368
Loc: Port Charlotte, FL
Re: July Nearing End, Tropics Waking Up [Re: MikeC]
      #75943 - Sun Jul 29 2007 10:06 AM

It isinteresting to see the improved organization on 98L this morning. Fish spinner for sure, but the tropics are definately starting to wake up a bit.

I know I will be watching the Gulf of Mexico with great interest this week. Still rubbing my eyes this morning from a long nights slumber, so I really haven't had a chance to look at many models. However, in viewing this mornings satellite images, it does appear that a general area of low pressure is forming in the Gulf already....So there may be something towatch before the late week period. Give or take a few miles, the area is about 200 miles west of SW FLorida or about 250 miles southof Apalachicola. If the area, gets better organized throught the next 24 hours, itmay become a pointof further discussion in the forum.

If ya'd like to have a look, here's the link: http://www.ssd.noaa.gov/goes/east/gmex/loop-vis.html


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stormchazer
Storm Tracker


Reged: Tue
Posts: 315
Loc: Central Florida
Re: July Nearing End, Tropics Waking Up [Re: dem05]
      #75945 - Sun Jul 29 2007 01:27 PM

I know 98L is the player being watched, but I wonder if a little something is not trying to get going in the GOM.

http://www.ssd.noaa.gov/goes/east/gmex/loop-vis.html

There has been some model support for a Low developing in the GOM for a few days now and shear is suppose to decrease.

--------------------
Jara

*************************************************************


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cieldumort
Moderator


Reged: Mon
Posts: 2305
Loc: Austin, Tx
Re: July Nearing End, Tropics Waking Up [Re: MikeC]
      #75947 - Sun Jul 29 2007 03:56 PM

NRL has hoisted a TCFA for 98L

TROPICAL CYCLONE FORMATION ALERT

SUBJ/TROPICAL CYCLONE FORMATION ALERT//
RMKS/1. FORMATION OF A TROPICAL CYCLONE IS POSSIBLE
WITHIN 100NM EITHER SIDE OF A LINE FROM 30.0N 73.5W
TO 34.6N 70.5W WITHIN THE NEXT 24 HOURS.
AVAILABLE DATA DOES NOT JUSTIFY ISSUANCE OF A
NUMBERED TROPICAL CYCLONE WARNING AT THIS TIME.

2. A LOW PRESSURE CENTER LOCATED NORTHEAST OF NASSAU,
BS HAS FORMED UNDERNEATH VERY INTENSE CONVECTIVE
ACTIVITY JUST TO THE EAST OF THE BAHAMAS. SYNOPTIC
OBSERVATIONS INDICATED LOW PRESSURE CENTERED NEAR
30.0N 73.5W WITH A CENTRAL PRESSURE OF 1013.0 MB.
WIND SHEAR OVER THE SYSTEM IS ANALYZED AT 10 TO 15
KNOTS. THE CONVECTION ASSOCIATED WITH THE SYSTEM IS
BEING PLACED 60NM TO THE SOUTH OF THE CENTER. HOWEVER,
WARM SEA SURFACE TEMPERATURES IN THE AREA CAN ENHANCE
TROPICAL CYCLONE DEVELOPMENT OVER THE NEXT 24 TO 48
HOURS.

3. THIS ALERT WILL BE REISSUED, UPGRADED TO WARNING OR
CANCELLED BY 301600Z JULY 2007.//
(LINK)



It is a bit odd that the 98L floater has been removed in light of everything else. (For now). The system appears to be slowly organizing -very- slowly, with two baby steps forward and one or one and a half baby step/s back. The combination of still difficult shear imparted mainly from the ULL to its northeast, and extratropical interaction with a preexisting trough seem to be hindering anything more at this time. 98L has a good 400 - 500 miles of acceptable SSTs ahead for possible subtropical and/or tropical development, and not an impossible atmosphere to work with.


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danielwAdministrator
Moderator


Reged: Wed
Posts: 3525
Loc: Hattiesburg,MS (31.3N 89.3W)
GOM Low? [Re: stormchazer]
      #75949 - Sun Jul 29 2007 11:45 PM

Current WV imagery does indicate cyclonic circulation in the Middle GOM. Centered near 25N/ 88W. It appears to be a mid-level circulation, and I'm not certain at this point if it has closed off.
Wind directions from the Slidell, Mobile, and Eglin NWS radar profiles indicate westerly winds from the surface to around 3000 feet. And Northerly winds above 3000 feet. More indicative of the weak, unusual for July, front poised near the Northern Gulf Coast.

Buoy observations are showing light winds with pressures below 29.92 in Hg.
Not much to look at for now. Enjoy the peace and quiet.

Excerpt from the QUANTITATIVE PRECIPITATION FORECAST DISCUSSION

ALL OF THE MODELS ARE SHOWING SOME TYPE OF
UPPER-LEVEL DISTURBANCE ENHANCING OVER THE ERN GULF OF MEXICO AND THE GFS IS THE BOLDEST IN ALLOWING THIS FEATURE TO GET CAUGHT UP IN THE SWRLY STEERING FLOW AHEAD OF THE UPPER TROUGH TO ENHANCE
RAINFALL TOTALS ACROSS FL. HPC FOLLOWED THIS TREND AND BUMPED UP QPF VALUES ACROSS THE FL PENINSULA FROM THE PREVIOUS FORECAST. (QPF values are rainfall totals~danielw)


Edited by danielw (Sun Jul 29 2007 11:57 PM)


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dem05
User


Reged: Wed
Posts: 368
Loc: Port Charlotte, FL
Re: GOM Low? [Re: danielw]
      #75950 - Mon Jul 30 2007 12:41 AM

Beyond my last post earlier on Sunday, I have been keeping an eye out there. You are pretty much correct. At the surface, a high pressure ridge (centered around Louisianna) is bringing westerly winds across the nothern portion of the Gulf of Mexico. Not so good for providing immediate tropical development in the Gulf from an area such as the one that was lurcking aroud today. Easterly winds in the Northern Gulf may have made a different case. In the mean time, many people saw some vorticiy out there, that was definately NOT at the surface and was more indicitave of a mid level low attempting to spin up. In the upper levels, winds were blowing out of the north and north north east as could be seen in the thunderstorm blow off across western Florida and the eastern half of the Gulf. Final nail in the coffin for any increased organization today was the abundance of outflow boundries from the thunderstorms in the eastern Gulf. Outflow boundries to some degree are not a bad thing for a developing system, as in the appropriate circumstances, they create lift that adds to additional thunderstorm development. However and for the most part in tropical development, you look for thunderstoms moving inward...today, there were large outflow boundries heading outward and the shear magnitude of these boundries probably limited the lifting action over the eastern Gulf and has squlched thunderstorm development this evening. There may have even been enough energy in some of these large boundries to disrupt that mid-levelvorticity that wasmore noticable earlier in the day...Not quite the right ingreedients for tropical development in the Gulf just yet, but some levelof thunderstormactivity has waxwd and wanned out there for about a week now. Being an "old salt" to GOMex weather, it is wiser to keep at least a half of one eye on the Gulf throught the week, something may still pop up out there...For now, this current feature looks pretty beaten up...

...Rest of the Basin: 98L pretty much looks like something that wanted to walk the talk, but didn't in the end. I give it less than a 10% shot now. In the end, timing is everything, and it was looking like a "lopsided" by this afternoon and it is fairly apparent that the upper trough was a bit too close to let this domuch more.

As fot the ITCZ...Nothing to write home about there either. Some interesting kinks affliliated with tropical waves are out there, but everything along the ITCZ looks too continuous (from Africa on Westward). Also, the ITCZ seems pretty flat in it's east to west orientation (kinks included). There are no definative systems there right now. Enjoy the break gang...things will probably kick up sometimesoon soon, so the down time is a great thing!

Edited by dem05 (Mon Jul 30 2007 01:46 AM)


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cieldumort
Moderator


Reged: Mon
Posts: 2305
Loc: Austin, Tx
Re: GOM Low? [Re: dem05]
      #75951 - Mon Jul 30 2007 02:14 AM

Quiet in the GOM, alright - conditions are definitively unfavorable for development there, at this time. Subject to change.

My attention remains drawn to 98L, as it ebbs and flows within its environment. Fair to call it a subtropical low riding along and within the parent trof, but none too impressive thus far. Still, 98L might have a window of as many as up to 2 or 3 or even 4 more days to pull something off. Given this large of a window, it might yet ratchet itself up for entry into the season totals. Some model support for brushing Nova Scotia with it later during extratropical transition.

Changing scenes a bit to areas that might actually impact the lower 48, a LLC appears to be forming within a convectively-active wave, located around 9N 45W. If it doesn't drive into northern South America and/or meet any untimely final death in the eastern Caribbean, this could be of far more interest later this week. Behind this feature is one rather large, but relatively dry, low level circulation, as well as numerous individual thunderstorm clusters, and at least one more impressive wave. Rolling off the tip of western Africa are two more ready-made Lows, although the associated convection is seriously starting to wane as they prepare to roll offshore.

With so much brewing in the wave train, as detailed above, this is the area I am most interested in for the coming week.


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nc_tropical_wx79
Weather Guru


Reged: Fri
Posts: 123
Re: GOM Low? [Re: cieldumort]
      #75952 - Mon Jul 30 2007 09:22 AM

99L is up on the navy site and floater is over the area. 99l is about (not being exact) 48W and 9N.

--------------------
W.D. Duncan


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Ron Basso
Storm Tracker


Reged: Thu
Posts: 267
Loc: hernando beach, FL
Re: 99L in Central Atlantic [Re: nc_tropical_wx79]
      #75953 - Mon Jul 30 2007 10:03 AM

ok folks time to wake up - 99L is up on the NRL site. Time for new thread? This is the one the GFS has been developing on and off the last week. Gonna be a Caribbean rider - looks like trouble ahead.

http://www.ssd.noaa.gov/goes/flt/t2/loop-avn.html

http://www.sfwmd.gov/org/omd/ops/weather/plots/storm_99.gif

--------------------
RJB


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nc_tropical_wx79
Weather Guru


Reged: Fri
Posts: 123
Re: 99L in Central Atlantic [Re: Ron Basso]
      #75954 - Mon Jul 30 2007 10:08 AM

99l is up and alive but there's an awful lot of dry air ahead of it so I am starting to doubt it will be long lived unless it can win the difficult fight it has ahead of it w/ that dry air.

--------------------
W.D. Duncan


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CaneTrackerInSoFl
Storm Tracker


Reged: Mon
Posts: 395
Loc: Israel
Re: 99L in Central Atlantic [Re: nc_tropical_wx79]
      #75955 - Mon Jul 30 2007 11:30 AM

The dry air isn't as expansive as we saw with the last system that tried to run the gauntlet there. In fact, I'd say that the dry air isn't nearly a detriment to this system as it is still in a moist environment and the dry air ahead appears to be waning in strength.


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


WARNING: Image is time sensitive.

--------------------
Andrew 1992, Irene 1999, Katrina 2005, Wilma 2005



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LoisCane
Veteran Storm Chaser


Reged: Fri
Posts: 1236
Loc: South Florida
id give it chances based on ships model [Re: CaneTrackerInSoFl]
      #75956 - Mon Jul 30 2007 11:51 AM

these are pretty high figures

SHIPS INTENSITY FORECAST

very impressive actually

and the orientation of the high has changed
sal isn't a problem

i think it's pretty impressive!!!

--------------------
http://hurricaneharbor.blogspot.com/

Edited by danielw (Mon Jul 30 2007 07:28 PM)


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Rabbit
Weather Master


Reged: Sat
Posts: 511
Loc: Central Florida
Re: id give it chances based on ships model [Re: LoisCane]
      #75957 - Mon Jul 30 2007 11:59 AM

NRL appears to have removed 98L

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D3m3NT3DVoRT3X
Weather Watcher


Reged: Thu
Posts: 48
Loc: The Burg < FL
Re: 99L in Central Atlantic [Re: CaneTrackerInSoFl]
      #75958 - Mon Jul 30 2007 12:24 PM

I saw this on bay news 9's website though it was pretty nifty off thier tropical update page .. shows current wind data Bay News 9 tropical update Once u get there open the page just click Atlantic Wind data pretty nifty stuff sorry if somebody has posted this already

Edited by D3m3NT3DVoRT3X (Mon Jul 30 2007 12:27 PM)


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Steve H1
Storm Tracker


Reged: Fri
Posts: 309
Loc: Palm Bay FL USA
Re: id give it chances based on ships model [Re: Rabbit]
      #75959 - Mon Jul 30 2007 12:27 PM

It is lacking moisture though. Although not a terribly dry environment, could be a lot of sinking/stable air in the Caribbean. It looks like she's drying up, but she is trying to pull up moisture from the south. Shear is not a factor. Let's see how she does today and tonight.

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Rich B
British Meteorologist


Reged: Sat
Posts: 498
Loc: Gloucestershire, England, UK
Re: id give it chances based on ships model [Re: Steve H1]
      #75960 - Mon Jul 30 2007 01:14 PM

OK, a little confused now but NRL have 98L up as 98L.LIMA... odd! Perhaps its gonna get classified. It certainly has become better organised, and has taken on a somewhat subtropical appearance. The strongest convection, in fact the only convection, is in a curved band in the eastern semi-circle. The LLCc has also become somewhat better defined. However, time is not on its side as it trundles slowly north-northeast towards cooler waters.

99L is also worth watching, but i havent looked at this much yet so i'll post on it later. However, suffice it to say this is easily more of a threat than 98L.

Regards

--------------------
Rich B

SkyWarn UK


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LoisCane
Veteran Storm Chaser


Reged: Fri
Posts: 1236
Loc: South Florida
Re: id give it chances based on ships model [Re: Rich B]
      #75961 - Mon Jul 30 2007 01:47 PM

yeah, sort of a battle between invests

though 98 still looks very subtropical to me.. moisture is mostly displaced from the center though some is trying to wrap in...


nice view
http://www.ssd.noaa.gov/goes/flt/t2/sloop-ir2.html


and 99 looks healthy and keeps moving west.. looks good on various sats and has a large pocket of moisture
http://www.nrlmry.navy.mil/sat-bin/displ...RENT=LATEST.jpg

--------------------
http://hurricaneharbor.blogspot.com/


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doug
Weather Analyst


Reged: Mon
Posts: 1006
Loc: parrish,fl
Re: id give it chances based on ships model [Re: LoisCane]
      #75962 - Mon Jul 30 2007 03:53 PM

Actually 98 appears to be improving with time, and my guess is it will get classified.
99 is a very nice system. I do not see the dry air problem at all as it is in a nice envelope of moisture.

--------------------
doug


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WeatherNut
Weather Master


Reged: Wed
Posts: 412
Loc: Atlanta, GA
Re: id give it chances based on ships model [Re: doug]
      #75963 - Mon Jul 30 2007 04:44 PM

Looks like 99L has some pretty good rotation. Its also really starting to fire some convection west of what looks like a COC. Also looks like some good outflow is developing

--------------------
Born into Cleo (64)...been stuck on em ever since


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MichaelA
Weather Analyst


Reged: Thu
Posts: 944
Loc: Pinellas Park, FL
Re: id give it chances based on ships model [Re: WeatherNut]
      #75964 - Mon Jul 30 2007 05:21 PM

I'm putting my marbles on 99L as the one that will form into something. 98L is sub-trop at best. Another wave East of 99L has some potential as well.

--------------------
Michael

PWS


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