South Atlantic Development?

[cycloneye]

Impressive circulation there.

03/1800 UTC 33.1S 23.6W ST2.5/2.5 90L -- South Atlantic

Woha SSD dvorak is with it in a sub-tropical stage.

http://weather.msfc.nasa.gov/GOES/goeseastfullir.html

Click the lower right of the pic.

It may turn out to be nothing but anyway we can talk about this while we wait for the season to start officially.

[HURAKAN]

As you said, impressive circulation, but the thunderstorm activity is not completely around the center, and to me it looks kind of subtropical. But, nevertheless, impressive.

[cycloneye]

Yes Sandy Subtropical as the SSD dvorak sat estimates say.

[P.K.]

Nothing on the NRL page yet. Ah, I see what they are looking at on the global sat images.

By the way that would be 90.T if we are going to use the proper letters.

[cycloneye]

:eek:

Nothing on the NRL page yet. Ah, I see what they are looking at on the global sat images.

By the way that would be 90.T if we are going to use the proper letters.

I am following what the dvorak T numbers SSD says about 90L not 90T.

03/1800 UTC 33.1S 23.6W ST2.5/2.5 90L -- South Atlantic

[vbhoutex]

Definitely has my interest. It will be interesting to see if it goes tropical, if it does anything. What I find impressive is the winds are close to the center but the convection is not. It would be late in the "season" in that area. And yes, I know they do not have a Hurricane season. At those latitudes things are beginning to get cooler and cooler this time of year, much like around November here I would think.

[P.K.]

I am following what the dvorak T numbers SSD says about 90L not 90T.

03/1800 UTC 33.1S 23.6W ST2.5/2.5 90L -- South Atlantic

L is the North Atlantic, T is the South Atlantic. I'm trying to remember if the Dvorak estimates said L or T last time we had one of these.

[cycloneye]

Definitely has my interest. It will be interesting to see if it goes tropical, if it does anything. What I find impressive is the winds are close to the center but the convection is not. It would be late in the "season" in that area. And yes, I know they do not have a Hurricane season. At those latitudes things are beginning to get cooler and cooler this time of year, much like around November here I would think.

Yes I agree with your words about this.If this develops it will be a subtropical system as you said it's almost winter down there in the Southern Hemisphere.

[cycloneye]

I am following what the dvorak T numbers SSD says about 90L not 90T.

03/1800 UTC 33.1S 23.6W ST2.5/2.5 90L -- South Atlantic

L is the North Atlantic, T is the South Atlantic. I'm trying to remember if the Dvorak estimates said L or T last time we had one of these.

It would be interesting to find that March 2004 T numbers for Catherina to see how they posted those letters.

[P.K.]

Here they are, but I'm sure it was given the letter T though. (By the Met Office if I remember correctly)

DATE/TIME LAT LON CLASSIFICATION STORM
28/0639 UTC 28.9S 49.7W OVERLAND 01L
27/2309 UTC 29.3S 48.2W T4.5/4.5 01L
27/1739 UTC 29.6S 47.4W T4.5/4.5 01L
27/1145 UTC 29.5S 46.4W T4.5/4.5 01L
27/0639 UTC 29.3S 45.6W T4.5/4.5 01L
26/2300 UTC 29.0S 44.8W T4.5/4.5 90
26/1709 UTC 29.0S 44.3W T4.5/4.5 90
26/1145 UTC 28.9S 43.7W T4.0/4.0 90
26/0639 UTC 28.7S 43.1W T3.5/3.5 90

[cycloneye]

http://www.nrlmry.navy.mil/tc-bin/tc_home2.cgi

P.K It's the letter L as it is at the 2004 Catherina Noname as 1L Noname.Go to years at NRL and at 2004 there it is.

[Derek Ortt]

L is used for the south atlantic as the models will not run otherwise

[P.K.]

To quote senorpepr from the last time we had an invest region down there:

Well, the USN uses the L-suffix for all Atlantic system, regardless of hemisphere. The UKMO, on the other hand, uses the T-suffix for South Atlantic systems.

The best guidance I have refers to using the T-suffix in this case.

Actually, if I'm not mistaken, it was the UKMO that first used the T-suffix for South Atlantic systems. They also used the M-suffix for Mediterranean systems.

[cycloneye]

Well let's not focus about a letter but most important about what is down there.

[Rainband]

like last year when some said the activity (hurricane) in the south atlantic had nothing to do with the season to come yeah right

[cyclonaut]

Sorry I could not see it on that link HURAKAN provided.

[cycloneye]

http://www.nrlmry.navy.mil/tc_pages/tc_home.html

I noticed that NRL now has 77L Invest and the pic of that area in the South Atlantic The area is at the center of the pic.

[Derek Ortt]

there is zero connection regarding activity in the south vs the north. Its a different basin and there are no connections due to no cross equatorial monsoo flow

[cycloneye]

Sorry I could not see it on that link HURAKAN provided.

http://www.nrlmry.navy.mil/tc_pages/tc_home.html

You can go to the link above and see the sat pic of the South Atlantic area.The area is at the center of the pic and it is small in diameter with little convection but with a good circulation.

[senorpepr]

Hmmm... I don't see the invest on NRL's webpage.

Anyway, on the letter assignment, it's really a coin-flip. The local models require the L suffix, as Derek mention. As PK quoted me on saying, USN also uses the L-suffix. This was used on the other two invests in the SoAtl in the past few years as well as Catarina. UKMO typically uses the T-suffix. Several world agencies also follow suit with the T-suffix.

My person thoughts is a T-suffix should be used officially. Remember back to Catarina, it was numbered 01L, as was Alex. A T-suffix would eliminate possible errors. (Note: USN/NRL had to renumber Catarina at a later time to 50L to avoid overwriting data when Alex developed.)