000 AGXX40 KNHC 100603 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 103 AM EST Sun Dec 10 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... High pres continues to build across the basin in the wake of a strong cold front now SE of the area with a cold air mass blanketing the waters. Marine conditions have improved significantly compared to yesterday with some lingering fresh to locally strong NW-N winds over far SE portions including the Yucatan Peninsula and Straits of Florida. Residual NW swell of 7-11 ft across the SE half of the basin will subside through the morning as will seas across the rest of the Gulf. The high will continue to build across the basin through Mon with only gentle to moderate winds and 1-3 ft seas across the waters by Mon afternoon, except 4-5 ft in stubborn NW swell in the far SE part. A cold front will clip the northern and eastern Gulf waters early Tue morning through Tue night with winds briefly increasing to moderate to fresh over those portions. New high pres will build back in the wake of the front through Thu with gentle winds and 1-3 ft seas prevailing basin-wide by then. Another cold front may clip the NE Gulf by late Thu night into Fri. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... Northerly swells propagating through Atlantic passages are subsiding to less than 8 ft. A strong cold front extends from central Cuba to the SW Caribbean offshore of Nicaragua. Active convection remains within 180 nm ahead of the front with heavy rain possible over eastern Cuba and the Cayman Islands. A gale warning remains in effect offshore of NE Honduras, and is now in effect for offshore of Nicaragua as well. Large seas of 8-13 ft in NW swell are over NW portions with seas building to 8-10 ft offshore of Nicaragua. Moderate to fresh trades prevail ahead of the front along with 5-8 ft seas. The front will stall as it reaches from near the Windward Passage to across western Jamaica to the SW Caribbean by late this coming night. Gale conditions will remain offshore of Nicaragua through Mon evening where seas will manage to build to up to 15 ft. The front will wash out by Wed with a remnant trough lingering through Thu. Leftover fresh to strong northerly flow off Nicaragua will finally diminish by Thu afternoon. Meanwhile, trades will begin to increase once the front washes out and the pressure gradient begins to reassert itself. Expect fresh to strong trades offshore of NW Colombia and in the Gulf of Venezuela by Thu night. ...SW N ATLANTIC INCLUDING THE BAHAMAS... A strong cold front reaches from near 31N70W to the SE Bahamas and approaching eastern Cuba. Active convection is within 180 nm either side of the front. Fresh to strong NW flow with a significantly cold airmass continue to filter in across the waters in the wake of the front along with 8-12 ft seas NE of the Bahamas. Fresh to near gale force southerly winds are N of 27N ahead of the front, with a gale warning in place N of 31N. Moderate to fresh E-SE flow and 6-9 ft seas in mixed swell cover the remainder of the waters E of the front. The front will continue to shift eastward and extend from 30N65W to the Turks and Caicos by this evening, then will stall from near 27N65W to the Windward Passage by Mon morning. Marine conditions will significantly improve through Mon and Mon night while the front holds in place. Another cold front will sweep across the far NW portion Tue through Wed with another round of fresh to near gale force winds and seas building to 8-13 ft across the waters N of 27N Tue afternoon through Wed. Conditions will improve thereafter as high pressure builds across the basin in the wake of the front. Yet another cold front may move into the NW waters by the end of the week. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... None. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... .AMZ019...CARIBBEAN FROM 15N TO 18N BETWEEN 80W AND 85W... Gale Warning early today. .AMZ029...W CENTRAL CARIBBEAN FROM 11N TO 15N W OF 80W... Gale Warning early today into Mon night. .AMZ039...SW CARIBBEAN S OF 11N INCLUDING APPROACHES TO PANAMA CANAL... Gale Warning today into tonight. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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 Lewitsky. National Hurricane Center.