Atlantic & Caribbean Outlook

National Hurricane Center Miami

        
000
AGXX40 KNHC 201723
MIMATS

Marine Weather Discussion
NWS National Hurricane Center Miami FL
123 PM EDT Wed Sep 20 2017

Marine Weather Discussion for the Gulf of Mexico, Caribbean Sea,
and Tropical North Atlantic from 07N to 19N between 55W and 64W
and the Southwest North Atlantic including the Bahamas.

...GULF OF MEXICO...

A thermal trough will develop each evening over the NW Yucatan 
Peninsula, move W-NW across the SW Gulf during the overnight 
hours and dissipate over the SW Gulf waters by late each 
morning.  Expect the trough to be accompanied by a moderate to 
locally fresh NE-E-SE wind shift and brief seas to 4 ft. A 
surface high will meander over the N-Central waters through Thu 
night, then shift N and inland Louisiana on Fri with light to 
locally moderate anticyclonic flow and 1 to 3 ft seas through 
Mon.

...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 
55W AND 64W...

Marine interests should monitor the latest NHC bulletins 
concerning major hurricane Maria currently in the vicinity of 
Puerto Rico, with the hurricane force radii forecast to pass 
along the NE coast of Hispaniola tonight into Thu, with seas in 
excess of 35 ft. Strong or greater southerly flow expected 
across the Caribbean waters N of 15N E of 73W today and Thu. 
Expect wind/sea conditions across the NE passages to diminish to 
20 kt or less, and seas to subside to less than 8 ft on Fri 
morning. Fresh N winds and seas to about 8 ft expected in the 
Windward Passage late Thu night into Fri morning. Elsewhere, 
moderate to locally fresh trades will return by Sun evening.
   
...SW N ATLANTIC INCLUDING THE BAHAMAS...

Major Hurricane Maria will move NW off the NW coast of Puerto 
Rico this afternoon passing N of the Mona Passage this evening, 
then begin to move more NNW and later N in response to a 
weakness in the subtropical ridge. This track keeps the center 
of Maria E of the central and northern Bahamas. Given that 
forecast track and intensity accuracy decreases further into the 
future, marine interests throughout the region should continue 
monitoring the latest bulletins issued by the National Hurricane 
Center on Hurricane Maria.

Southerly swell associated with Maria in excess of 8 ft will mix 
with lingering northerly swell associated with Jose over the 
waters north of 28N and E of 78W through tonight, with the 
southerly swell ahead of Maria becoming dominant through early 
next week as Maria continues North of the area.  

$$

.WARNINGS...Any changes impacting coastal NWS offices will be
coordinated through AWIPS II Collaboration Chat, or by
telephone:

.GULF OF MEXICO...
     None.

.CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN
55W AND 64W...
.AMZ023...CARIBBEAN N OF 15N BETWEEN 64W AND 72W...
     Tropical Storm Warning today into tonight. 

.SW N ATLANTIC INCLUDING THE BAHAMAS...
.AMZ117...BAHAMAS INCLUDING CAY SAL BANK...
     Tropical Storm Warning Thu night into Fri. 
.AMZ119...ATLANTIC FROM 22N TO 27N E OF BAHAMAS TO 70W...
     Tropical Storm Warning Thu.
     Hurricane Warning Thu night into Fri. 
.AMZ121...ATLANTIC FROM 22N TO 27N BETWEEN 65W AND 70W...
     Tropical Storm Warning Thu.
     Hurricane Warning Thu night.
     Tropical Storm Warning Fri.
.AMZ123...ATLANTIC S OF 22N W OF 70W INCLUDING APPROACHES TO THE
WINDWARD PASSAGE...
     Tropical Storm Warning tonight.
     Hurricane Warning Thu into Fri. 
.AMZ125...ATLANTIC S OF 22N BETWEEN 65W AND 70W INCLUDING PUERTO
RICO TRENCH...
     Hurricane Warning today into Thu night. 
     Tropical Storm Warning Fri.

$$

*For detailed zone descriptions, please visit:
http://www.nhc.noaa.gov/abouttafbprod.shtml#OWF

Note: gridded marine forecasts are available in the National
Digital Forecast Database (NDFD) at:
http://www.nhc.noaa.gov/marine/grids.php

For additional information, please visit:
http://www.nhc.noaa.gov/marine

$$

.Forecaster Nelson. National Hurricane Center.