587 AGXX40 KNHC 231824 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 224 PM EDT Thu Aug 23 2018 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 cold front is over the N Gulf of Mexico from 31N80W to 29N83W. A stationary front continues to 27N90W to 29N95W. A pre-frontal trough extends from N Florida near 29N82W to the NE Gulf near 26N86W. Widely scattered moderate convection is within 90 nm of the pre-frontal trough. A 1018 mb high is located over the northwest Gulf near 25N95W. Elsewhere, scattered showers are over the Bay of Campeche from 17N-20N between 93W-96W. The present pressure gradient across the Gulf supports light to gentle winds throughout, with a wind shift along the frontal system. In the upper levels, an upper level high centered over Texas near 32N99W is producing NE upper level winds over the Gulf with upper level moisture. The cold front will stall out over the northeast Gulf tonight, with the frontal system as a whole transitioning to a trough Fri and drifting northward this weekend. A surface trough will develop along the western Yucatan Peninsula during the late afternoons, then drift westward during the overnight hours accompanied by a fresh east to southeast wind shift with the trough dissipating along 96W during the late mornings. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... An upper level low is centered over the Cayman Islands near 19N81W. The low is producing scattered showers near the upper low center and is enhancing convection over the SW Caribbean due to upper level diffluence. Scattered moderate to isolated strong convection is over the SW Caribbean S of 12N to include Panama and Costa Rica. Elsewhere, scattered showers are over the SE Caribbean from 11N-15N between 61W-68W. Strong nocturnal pulses are forecast through the upcoming weekend along the coast of NE Colombia and W Venezuela with seas building to 9 ft. A tropical wave along 75W will continue west across the western on Fri and Sat. A second tropical wave along 52W will reach along 55W later today and enter the east Caribbean by early Sat. ...SW N ATLANTIC INCLUDING THE BAHAMAS... A cold front is off the coast of N Florida from 32N79W to 31N80W. Widely scattered moderate convection is from 27N-32N west of 75W. Scattered showers are over the west Atlantic from 25N- 29N between 65W-72W due to an upper level low centered near 26N72W. An east to west ridge will meander from near 29N65W to S Florida for the next few days as the cold front stalls just off the northeast coast of Florida tonight and then drifts north on Fri. Moderate to locally fresh southerly winds are expected north of ridge ahead of the front, and moderate to fresh trades are expected south of 23N, except becoming locally strong along the north coast of Hispaniola this afternoon into early evening. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... None. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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 Latto. National Hurricane Center.