000
ABNT20 KNHC 241141
TWOAT 

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.

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.

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.

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