[Tropical] Tropical Weather Outlook and Summary

[EMWIN Server]

ABNT20 KNHC 241954
TWOAT


Special Tropical Weather Outlook

NWS National Hurricane Center Miami FL

355 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
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