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Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 AM EDT Fri Sep 24 2021

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

The National Hurricane Center is issuing advisories on recently 
upgraded Hurricane Sam, located about 1400 miles east-southeast of 
the northern Leeward Islands.

1. A large area of showers and thunderstorms centered a couple 
hundred miles east of Bermuda is associated with a formative surface 
low interacting with an upper-level trough.  Additional tropical or 
subtropical development of this system could occur through early 
Saturday as it moves generally north-northwestward.  After that 
time, development is not expected due to strong upper-level winds. 
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...medium...40 percent.
* Formation chance through 5 days...medium...40 percent.

2. A gale-force, non-tropical low pressure system, the remnants of 
Odette, is located a little less than 600 miles west-northwest of 
the westernmost Azores.  Showers and thunderstorms remain limited 
near the low, and the window of opportunity for this system to 
become a subtropical or tropical cyclone is closing as strong 
upper-level winds are expected to develop over the system later 
today. This system will move generally south-southeastward over the 
next day or two.  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...low...20 percent.
* Formation chance through 5 days...low...20 percent.

3. A tropical wave is expected to move off the west coast of Africa by 
the end of this weekend.  Thereafter, environmental conditions are 
forecast to be conducive for gradual development, and a tropical 
depression could form by the middle of next week while the system 
moves westward at 10 to 15 mph over the far eastern tropical 
Atlantic.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 5 days...medium...40 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 Papin