ZCZC MIATCDAT2 ALL
TTAA00 KNHC DDHHMM
 
Hurricane Larry Discussion Number   7
NWS National Hurricane Center Miami FL       AL122021
500 AM AST Thu Sep 02 2021

Larry's cloud pattern has gradually become better organized, with 
deep convection increasing in coverage and intensity near the 
center and a banding-type eye trying to form.  Upper-level outflow 
is most prominent over the western and northern portions of the 
circulation.  A well-defined low-level eye was apparent on an 
AMSR-2 image from a few hours ago.  Dvorak final T- and Current 
Intensity-numbers from both TAFB and SAB are 4.0/4.0, corresponding 
to an intensity of 65 kt.  Based on these estimates, Larry is 
upgraded to a hurricane, the fifth of the 2021 Atlantic season.

The hurricane is moving just slightly north of west, or 280/17 kt.  
There are no important changes to the track forecast scenario from 
the previous advisory.  Larry is likely to move along the southern 
and southwestern periphery of a strong deep-layer subtropical high 
pressure area over the east-central Atlantic during the next few 
days.  This should result in a gradual turn toward the 
west-northwest during the next 48-72 hours.  A turn toward the 
northwest is likely in 4-5 days as the system approaches a weakness 
in the ridge.  The track models are fairly well clustered on this
future direction of motion with some differences in forward speed.  
The official track forecast is quite similar to the previous one 
and is also very close to the latest dynamical model consensus, 
TVCA.

Larry is expected to remain in an environment conducive for 
strengthening over the next few days, with marginally warm 
SSTs, low vertical shear, and surrounded by broad-scale anticyclonic
upper-level flow.  Therefore, strengthening is likely, and the 
official forecast calls for Larry to become a major hurricane in 48 
hours or so.  Some fluctuations in intensity due to eyewall 
replacements are possible around and after that time.  Late in the 
forecast period, slightly drier air in the environment could limit 
further intensification.  The official intensity forecast is close 
to the latest NOAA corrected consensus, HCCA, guidance.

 
FORECAST POSITIONS AND MAX WINDS
 
INIT  02/0900Z 13.0N  32.3W   65 KT  75 MPH
 12H  02/1800Z 13.4N  34.7W   75 KT  85 MPH
 24H  03/0600Z 14.0N  37.9W   85 KT 100 MPH
 36H  03/1800Z 14.8N  40.9W   95 KT 110 MPH
 48H  04/0600Z 15.8N  43.6W  100 KT 115 MPH
 60H  04/1800Z 16.9N  46.1W  105 KT 120 MPH
 72H  05/0600Z 18.3N  48.3W  110 KT 125 MPH
 96H  06/0600Z 20.9N  52.1W  115 KT 130 MPH
120H  07/0600Z 23.8N  55.4W  110 KT 125 MPH
 
$$
Forecaster Pasch
 
NNNN