Official Discussion issued by the National Hurricane Center

Rina (AL182023) DATA RELEASED: 9/28/2023 9:00:00 PM UTC

Copy of official data

Tropical Storm Rina Discussion Number   2
NWS National Hurricane Center Miami FL       AL182023
500 PM AST Thu Sep 28 2023

Tropical Storm Rina has not changed much this afternoon. Visible 
satellite imagery indicates that the center of circulation is 
mostly exposed to the northwest of persistent deep convective 
activity. Subjective Dvorak estimates from SAB and TAFB both support 
an initial intensity of 35 kt for this advisory.

A combination of Rina's close proximity to Tropical Storm Philippe 
and moderate deep-layer northwesterly shear is likely to limit 
intensification in the short term. This shear is expected to 
increase this weekend and early next week, and it not forecast to 
abate during the forecast period. The NHC forecast remains in the 
middle of the guidance envelope and is slightly lower than the prior 
forecast. While Rina is expected to remain a tropical storm 
throughout the forecast period, uncertainty in the intensity 
forecast is higher than normal due to the potential interaction with 

Rina is moving northwestward, with an initial forward speed
near 12 kt. The tropical storm should begin to turn more westward
tonight and continue this general motion for the next several days.
Early next week, the system is expected to turn northward and 
eventually northeastward as a mid-level ridge builds to the west. 
The NHC forecast is a blend of the prior forecast and the HCCA and 
TVCN consensus guidance throughout the forecast period. As 
with the intensity forecast, confidence in the track forecast is 
lower than normal due to uncertainty regarding the potential 
interaction of Rina with Tropical Storm Philippe during the next 
several days.


INIT  28/2100Z 18.1N  46.2W   35 KT  40 MPH
12H  29/0600Z 18.8N  46.9W   40 KT  45 MPH
24H  29/1800Z 19.4N  47.9W   45 KT  50 MPH
36H  30/0600Z 19.7N  48.9W   45 KT  50 MPH
48H  30/1800Z 20.1N  50.1W   45 KT  50 MPH
60H  01/0600Z 20.6N  51.4W   45 KT  50 MPH
72H  01/1800Z 21.5N  53.3W   40 KT  45 MPH
96H  02/1800Z 24.2N  56.7W   35 KT  40 MPH
120H  03/1800Z 26.8N  58.4W   35 KT  40 MPH

Forecaster Hogsett/Cangialosi