SATL: Akará - Post-Tropical

[cycloneye]

TXST21 KNES 191818
TCSSTL

A. 01Q (AKARA)

B. 19/1800Z

C. 31.1S

D. 42.2W

E. THREE/GOES-E

F. T1.5/2.5

G. IR/EIR/VIS

H. REMARKS...SYSTEM LACKS DEEP CONVECTION RESULTING IN DT=0. LLCC REMAINS
LARGE AND WELL-DEFINED. MET AND PT N/A. FT BASED ON CONSTRAINTS LIMITING
FT CHANGE TO 1.0 IN 6 HR.

I. ADDL POSITIONS

NIL


...KONON

[cycloneye]

New warning mantains as Tropical Storm.

SPECIAL WARNING
ISSUED AT 2240Z – MON – 19/FEB/2024
TROPICAL STORM AKARÁ WITH CENTRAL PRESSURE 998 HPA AT 31.5S042.5W MOVING TO SOUTH WITH ESTIMATED MAXIMUM WINDS FORCE 9 (40/45 KT) AT SOUTHWEST SECTOR AND ROUGH SEA ASSOCIATED WITH WAVES 3.0/4.0 METERS OFFSHORE AFFECTING ALFA AND SOUTH OCEANIC AREAS.
ESTIMATED POSITION:
200000Z: 31.5S 042.5W – 994 HPA – MAXIMUM SUSTAINED WIND 40/45 KT – TROPICAL STORM
200600Z: 32S 042W – 994 HPA – MAXIMUM SUSTAINED WIND 40/45 KT – TROPICAL STORM
201200Z: 32S 042W – 996 HPA – MAXIMUM SUSTAINED WIND 40/45 KT – TROPICAL STORM
201800Z: 32S 042W – 996 HPA – MAXIMUM SUSTAINED WIND 40/45 KT – TROPICAL STORM
210000Z: 32S 042W – 998 HPA – MAXIMUM SUSTAINED WIND 40/45 KT – TROPICAL STORM
210600Z: 32S 042.5W – 998 HPA – MAXIMUM SUSTAINED WIND 40/45 KT – TROPICAL STORM
211200Z: 32.5S 042.5W – 1000 HPA – MAXIMUM SUSTAINED WIND 40/45 KT – TROPICAL STORM
VALID UNTIL 221200.

https://www.marinha.mil.br/chm/dados-do ... s/warnings

[cycloneye]

The lack of convection is causing the dvorak numbers to go down.

TXST21 KNES 200024
TCSSTL

A. 01Q (AKARA)

B. 20/0000Z

C. 31.7S

D. 42.5W

E. THREE/GOES-E

F. T1.0/2.0

G. IR/EIR/SWIR

H. REMARKS...THE SYSTEM LACKS DEEP CONVECTION WHICH RESULTS IN A DT OF
0.0. THE MET IS 1.0 BASED ON A WEAKENING TREND OVER THE PAST 24 HOURS. THE
PT IS LESS THAN 1.0. THE FT IS BASED ON CONSTRAINTS LIMITING THE CHANGE
IN T-NUMBER TO 1.5 OVER 12 HOURS.

I. ADDL POSITIONS

NIL


...COVERDALE

[Ptarmigan]

Not often a tropical cyclone forms in the South Atlantic. One would think there would be more tropical cyclones forming in the South Atlantic. Strong wind shear, cooler water temperature, and lack of ITCZ.

[cycloneye]

Does anyone have a list of all the SATL cyclones? Only remenber Caterina in 2004 that was a hurricane.

[wxman57]

Does anyone have a list of all the SATL cyclones? Only remenber Caterina in 2004 that was a hurricane.

Here you go: https://en.wikipedia.org/wiki/South_Atlantic_tropical_cyclone

This one looks like it may have briefly been a subtropical storm. I disagree with the current TS classification. Nothing tropical about it.

[cycloneye]

 https://twitter.com/WillWeatherRVA/status/1759949683219210395

[cycloneye]

The Brazil Navy that issue the warnings are very slow doing so. This is not a Tropical Cyclone anymore.

[cycloneye]

They are still hanging with Tropical Storm classification.

WARNING NR 092/2024
SPECIAL WARNING
ISSUED AT 1500Z – TUE – 20/FEB/2024
TROPICAL STORM AKARÁ WITH CENTRAL PRESSURE 996 HPA AT 32.5S 041.5W MOVING TO SOUTH WITH ESTIMATED MAXIMUM WINDS FORCE 8 (33/40 KT) AT SOUTH AND EAST SECTORS AND ROUGH SEA ASSOCIATED WITH WAVES 3.0/4.0 METERS OFFSHORE AFFECTING ALFA AND SOUTH OCEANIC AREAS.
ESTIMATED POSITION:
201800Z: 32.5S 041.5W – 996 HPA – MAXIMUM SUSTAINED WIND 33/40 KT – TROPICAL STORM

210000Z: 32.5S 041.5W – 998 HPA – MAXIMUM SUSTAINED WIND 28/33 KT – TROPICAL DEPRESSION

210600Z: 32.5S 042W – 998 HPA – MAXIMUM SUSTAINED WIND 28/33 KT – TROPICAL DEPRESSION

211200Z: 33S 042.5W – 1000 HPA – MAXIMUM SUSTAINED WIND 28/33 KT – SUBTROPICAL DEPRESSION
211800Z: 33.5S 042.5W – 1000 HPA – MAXIMUM SUSTAINED WIND 28/33 KT – SUBTROPICAL DEPRESSION
220000Z: 34S 043W – 1002 HPA – MAXIMUM SUSTAINED WIND 28/33 KT – SUBTROPICAL DEPRESSION
220600Z: 34.5S 043.5W – 1004 HPA – MAXIMUM SUSTAINED WIND 28/33 KT – SUBTROPICAL DEPRESSION
VALID UNTIL 221200.

https://www.marinha.mil.br/chm/dados-do ... s/warnings

[AJC3]

The entire western semicircle of Akará now consists of closed-cell (overcast) cold-air stratocumulus.

Bones should have been on the phone with Navy Brazil a good 24 hours ago.

[cycloneye]

Surely this.

 https://twitter.com/UWCIMSS/status/1760064426864980441

[rodolfo alves]

Akará is downgraded to Tropical Depression in Navy Chart 0Z

[cycloneye]

They are still keeping it alive now as a subtropical depression.

WARNING NR 094/2024SPECIAL WARNING
ISSUED AT 1400Z – WED – 21/FEB/2024
SUBTROPICAL DEPRESSION AKARÁ WITH CENTRAL PRESSURE 1002 HPA AT 32.5S 042.5W MOVING TO SOUTHWEST WITH ESTIMATED MAXIMUM WINDS FORCE 7 (28/33 KT) AT SOUTH AND EAST SECTORS, AFFECTING ALFA AND SOUTH OCEANIC AREAS.
ESTIMATED POSITION:
211800Z: 33S 043W – 1002 HPA – MAXIMUM SUSTAINED WIND 28/33 KT – SUBTROPICAL DEPRESSION
220000Z: 33.5S 043W – 1004 HPA – MAXIMUM SUSTAINED WIND 28/33 KT – SUBTROPICAL DEPRESSION
220600Z: 34S 044W – 1004 HPA – MAXIMUM SUSTAINED WIND 28/33 KT – SUBTROPICAL DEPRESSION
VALID UNTIL 221200.

[rodolfo alves]

[ChrisH-UK]

Looks like the shear has got the better of Akara.

GOES-16 Geo Colour + Clean IR - https://col.st/0s05Q

[rodolfo alves]

Probably the last synoptic chart with Akará.

[cycloneye]

Finnally Tony. No more special warnings from the Brazil Navy.

https://www.marinha.mil.br/chm/dados-do ... s/warnings

[rodolfo alves]

Akará is over

[rodolfo alves]

"A rare tropical storm has made landfall in Brazil"