Thursday, September 2, 2021

RTW TRACKING THE TROPICS UPDATE

 

NATIONAL HURRICANE CENTER

000
ABNT20 KNHC 021750
TWOAT 

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
200 PM EDT Thu Sep 2 2021

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

The National Hurricane Center is issuing advisories on Hurricane 
Larry, located over the eastern tropical Atlantic several hundred 
miles west of the southernmost Cabo Verde Islands. 

A small area of low pressure over northeastern Nicaragua is 
producing disorganized shower and thunderstorm activity over 
portions of the western Caribbean Sea.  A portion of the low's 
circulation could move over the Gulf of Honduras on Friday.  
However, development there, if any, is expected to be slow to occur. 
This system could then move over the southwestern Gulf of Mexico 
during the weekend and early next week, but by then strong 
upper-level winds would likely limit significant development.  
Regardless of development, heavy rains are possible across portions 
of Central America and the Yucatan Peninsula through the weekend.
* Formation chance through 48 hours...low...10 percent. 
* Formation chance through 5 days...low...20 percent.

Showers and thunderstorms associated with an area of low pressure 
about 280 miles southeast of the southernmost Cabo Verde Islands 
continue to show signs of organization.  Some development of this 
system could occur during the next 12-24 hours as the low moves 
generally westward at 10-15 mph.  After that time, conditions 
are expected to become less conducive for development.  Interests 
in the Cabo Verde Islands should monitor the progress of this 
system.
* Formation chance through 48 hours...low...30 percent. 
* Formation chance through 5 days...low...30 percent.

$$
Forecaster Beven

 

18Z-12Z-06Z GUIDANCE MODEL TREND




RTW TRACKING THE TROPICS UPDATE

 

NATIONAL HURRICANE CENTER
736 
ABNT20 KNHC 021459
TWOAT 

Special Tropical Weather Outlook
NWS National Hurricane Center Miami FL
1100 AM EDT Thu Sep 2 2021

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

Special tropical weather outlook issued to introduce a new system 
located to the east-southeast of the Cabo Verde Islands.

The National Hurricane Center is issuing advisories on Hurricane 
Larry, located over the eastern tropical Atlantic several hundred 
miles west-southwest of the southernmost Cabo Verde Islands. 

A small area of low pressure over northeastern Nicaragua is 
producing disorganized shower and thunderstorm activity.  A 
portion of the low's circulation could move over the Gulf of 
Honduras on Friday.  However, development there, if any, is expected 
to be slow to occur.  This system could then move over the 
southwestern Gulf of Mexico during the weekend and early next week, 
but by then strong upper-level winds would likely limit significant 
development.  Regardless of development, heavy rains are possible 
across portions of Central America and the Yucatan Peninsula 
through the weekend.
* Formation chance through 48 hours...low...10 percent. 
* Formation chance through 5 days...low...20 percent.

Satellite imagery and recent satellite wind data indicate that a 
low pressure area has formed about 300 miles east-southeast of the 
southernmost Cabo Verde Islands, and that the associated showers 
and thunderstorms show signs of organization.  Some additional 
development could occur during the next 12-24 hours as the low 
moves generally westward at about 15 mph.  After that time, 
conditions are expected to become less conducive for development.  
Interests in the Cabo Verde Islands should monitor the progress of 
this system.
* Formation chance through 48 hours...low...30 percent. 
* Formation chance through 5 days...low...30 percent.

$$
Forecaster Beven/Papin 

 


...HURRICANE LARRY WILL BE MOVING THROUGH WARMER WATERS AND RAPID INTENSIFICATION WILL BEGIN OVER THE WEEKEND IF NOT BEFORE...

 

SO FAR LARRY CONTINUES TO GROW AND STRENGTHEN.  MODELS ARE SOME WHAT IN AGREEMENT THAT LARRY WILL STAY OUT OVER THE ATLANTIC AND ONLY BE A THREAT TO SHIPPING LANES.  MODEL TRENDS DO NOT SHOW A WESTWARD TRACK SO THIS IS GOOD NEWS.  THE GFS ENSEMBLE ALSO AGREE ON THE TRACK OVER THE OPEN WATERS OF THE ATLANTIC.

RTW

NATIONAL HURRICANE CENTER

...LARRY IS LARGER AND A BIT STRONGER... ...STEADY TO RAPID INTENSIFICATION LIKELY IN THE COMING DAYS...


11:00 AM AST Thu Sep 2
Location: 13.5°N 34.2°W
Moving: W at 17 mph
Min pressure: 985 mb
Max sustained: 80 mph



 

06Z GFS ENSEMBLE MEMBER

12Z-06Z-00Z-18Z GUIDANCE MODEL TREND











Wednesday, September 1, 2021

...LARRY A CAT ONE HURRICANE OVER THE EAST ATLANTIC....LARRY COULD BECOME CAT 5...

 

 NATIONAL HURRICANE CENTER

...LARRY STRENGTHENING QUICKLY AND NOW EXPECTED TO BECOME A HURRICANE TONIGHT...


8:00 PM CVT Wed Sep 1
Location: 12.5°N 29.4°W
Moving: W at 22 mph
Min pressure: 991 mb
Max sustained: 70 mph



 





RTW TRACKING THE TROPICS UPDATE INVEST 91L

 

NATIONAL HURRICANE CENTER TROPIC OUTLOOK

000
ABNT20 KNHC 011746
TWOAT 

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
200 PM EDT Wed Sep 1 2021

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

The National Hurricane Center is issuing advisories on Tropical 
Depression Kate, located over the central Atlantic and on Tropical 
Storm Larry, located over the far eastern tropical Atlantic several 
hundred miles southwest of the Cabo Verde Islands.

The Weather Prediction Center is issuing Public Advisories on 
Post-Tropical Cyclone Ida, located over the Mid-Atlantic United 
States.

Recent satellite wind data indicates the area of low pressure 
located in the southwestern Caribbean Sea has a well-defined 
circulation. However, shower and thunderstorm activity remains 
disorganized and displaced north of the center. Some slow 
development of this system remains possible over the next day or two 
if it remains over open water while moving west-northwestward or 
northwestward at 5 to 10 mph along the coast of Central America. By 
early next week, the system will have another opportunity for 
gradual development in the southwestern Gulf of Mexico. Regardless 
of development, heavy rains are possible across portions of Central 
America and the Yucatan Peninsula by late this week into the 
weekend.
* Formation chance through 48 hours...low...30 percent. 
* Formation chance through 5 days...low...30 percent.

&&
Public advisories issued by the Weather Prediction Center on 
Post-Tropical Cyclone Ida can be found under AWIPS header TCPAT4, 
WMO header WTNT34 KWNH, and on the web at 
http://www.wpc.ncep.noaa.gov

Public Advisories on Tropical Storm Larry are issued under 
WMO header WTNT32 KNHC and under AWIPS header MIATCPAT2. 
Forecast/Advisories on Tropical Storm Larry are issued under 
WMO header WTNT22 KNHC and under AWIPS header MIATCMAT2.

$$
Forecaster Papin

 



RTW TRACKING THE TROPICS UPDATE LARRY AND INVEST 91L SEPT 1, 2021

 

...LARRY STRENGTHENS AS IT MOVES QUICKLY WESTWARD THROUGH THE EASTERN TROPICAL ATLANTIC...


2:00 PM CVT Wed Sep 1
Location: 12.3°N 27.6°W
Moving: W at 22 mph
Min pressure: 1001 mb
Max sustained: 50 mph

https://www.nhc.noaa.gov/ 

 






12Z GUIDANCE MODELS

GFS ENSEMBLE 91L