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Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 PM EDT Sat Sep 18 2021

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

The National Hurricane Center has issued the last advisory on 
Post-Tropical Cyclone Odette, located a few hundred miles 
east-southeast of Nantucket, Massachusetts.

1. Showers and thunderstorms associated with an area of low pressure 
located about 600 miles east-southeast of the northern Leeward 
Islands continue to show signs of organization.  In addition, 
satellite images and surface observations indicate that the 
circulation is gradually becoming better defined.  If the current 
trend continues, advisories would likely be initiated on a tropical 
depression or tropical storm later tonight or early Sunday. This 
system is expected to be near the northern Leeward Islands on Monday 
and Tuesday, and interests there should monitor its progress. 
Upper-level winds are likely to become less conducive for 
development when the system reaches the southwestern Atlantic by the 
early to middle part of next week.  Additional information on this 
system, including gale warnings, can be found in High Seas Forecasts 
issued by the National Weather Service.
* Formation chance through 48 hours...high...90 percent.
* Formation chance through 5 days...high...90 percent.

2. Showers and thunderstorms are also showing signs of organization in 
association with a low pressure system located over the far eastern 
Atlantic a few hundred miles south-southwest of the Cabo Verde 
Islands.  Environmental conditions appear conducive for further 
development of this system, and a tropical depression is likely to 
form during the next day or two while moving toward the northwest at 
10 to 15 mph to the west of the Cabo Verde Islands.  This system is 
expected to reach cooler waters and an area of stronger upper-level 
winds early next week, which should limit its development.
* Formation chance through 48 hours...high...70 percent.
* Formation chance through 5 days...high...70 percent.

High Seas Forecasts issued by the National Weather Service
can be found under AWIPS header NFDHSFAT1, WMO header FZNT01 
KWBC, and online at ocean.weather.gov/shtml/NFDHSFAT1.php

Forecaster Cangialosi