529 
ABNT20 KNHC 241958
TWOAT 

Special Tropical Weather Outlook...Retransmitted
NWS National Hurricane Center Miami FL
400 PM EDT Fri Sep 24 2021

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

Special tropical weather outlook issued for the system located to 
the north-northeast of Bermuda. 

The National Hurricane Center is issuing advisories on Hurricane  
Sam, located about 1300 miles east-southeast of the northern Leeward 
Islands. 

Updated: Recent visible satellite imagery indicates that a 
well-defined center has formed with a surface low located a couple 
hundred miles north-northeast of Bermuda interacting with an 
upper-level trough. In addition, the low is producing gale-force 
winds on the north side of its circulation. Additional development 
into a subtropical storm is now expected, and advisories will likely 
be initiated this afternoon as the system moves slowly toward the 
north-northwest. 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.

A gale-force, non-tropical low pressure system, the remnants of 
Odette, is located less than 600 miles west of the westernmost 
Azores.  Showers and thunderstorms have mostly dissipated near the 
low, and strong upper-level winds are now expected to prevent 
further development as this system moves gradually southward until 
dissipation.  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...near 0 percent.
* Formation chance through 5 days...low...near 0 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.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 5 days...medium...50 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/Landsea