000
AGXX40 KNHC 201808
MIMATS

MARINE WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
208 PM EDT TUE AUG 20 2013

MARINE WEATHER DISCUSSION FOR THE GULF OF MEXICO...CARIBBEAN
SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND
64W...AND THE SW N ATLANTIC INCLUDING THE BAHAMAS.

...GULF OF MEXICO...                                        

MODEL PREFERENCE: PREVIOUS FORECAST BLENDED WITH LATEST GFS WITH 
HIGH CONFIDENCE.

A WEAK TROPICAL WAVE PREVAILS OVER THE S CENTRAL GULF OF MEXICO. 
HIGH PRESSURE RIDGE PREVAILS WELL N OF THE FORECAST AREA. THIS IS
MAINTAINING A WEAK PRESSURE GRADIENT OVER THE FORECAST AREA. LATEST
SATELLITE DERIVED WINDS AND SEAS ALONG WITH SHIP AND BUOY
OBSERVATIONS DEPICT MAINLY GENTLE TO MODERATE WINDS. SEAS ARE IN
THE 1-3 FT RANGE. THE TROPICAL WAVE WILL MOVE SLOWLY WESTWARD
ACROSS THE WESTERN GULF WATERS THROUGH REMAINDER OF THE
WEEK...MOVING INLAND OF EASTERN MEXICO FRI. OTHERWISE THE WEAK
PRESSURE GRADIENT WILL PREVAIL WITH MAINLY GENTLE TO MODERATE
WINDS AND SEAS 3 FT OR LESS PREVAILING THROUGH THE WEEK.

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

MODEL PREFERENCE: PREVIOUS FORECAST BLENDED WITH LATEST GFS WITH
HIGH CONFIDENCE.

A TROPICAL WAVE IS MOVING THROUGH THE CENTRAL CARIBBEAN WATERS
WITH A WEAK SURFACE TROUGH TO THE EAST OF THE WAVE GENERALLY FROM
THE MONA PASSAGE TO THE ABC ISLANDS. LATEST SATELLITE DERIVED
WINDS AND SEAS ALONG WITH SHIP AND BUOY DATA DEPICT MODERATE TO
FRESH WINDS PREVAIL OVER THE CENTRAL AND EASTERN CARIBBEAN WITH
MODERATE TRADES PREVAILING OVER THE WESTERN CARIBBEAN AND TROPICAL
N ATLC WATERS. SEAS OVER THE CENTRAL AND EASTERN CARIBBEAN ARE IN
THE 4-6 FT RANGE...2-3 FT IN THE WESTERN CARIBBEAN AND FAR EASTERN
CARIBBEAN...AND 5-6 FT IN THE TROPICAL N ATLC WATERS. THE TROPICAL
WAVE WILL CONTINUE TO MOVE WESTWARD ACROSS THE REMAINDER OF THE
CENTRAL CARIBBEAN THROUGH WED...THEN ACROSS THE WESTERN CARIBBEAN
THU THROUGH SAT. WITH LOW PRESSURE OVER COLOMBIA DEEPENING OVER
THE NEXT 24 HOURS...THE PRESSURE GRADIENT WILL TIGHTEN OVER THE
CENTRAL CARIBBEAN WATERS. THIS WILL STRENGTHEN THE TRADES AND
BUILD SEAS TO 9 FT OVER THIS AREA BY MIDWEEK AND WILL PREVAIL
THROUGH THE REMAINDER OF THE WEEK.

...SW N ATLANTIC INCLUDING THE BAHAMAS... 

MODEL PREFERENCE: PREVIOUS FORECAST BLENDED WITH LATEST GFS WITH
HIGH CONFIDENCE.

THE NORTHERN EXTENT OF A TROPICAL WAVE IS MOVING THROUGH THE SE
BAHAMAS. A SURFACE RIDGE PREVAILS N OF THE FORECAST AREA ROUGHLY
ALONG 32N. LATEST SATELLITE DERIVED WINDS AND SEAS ALONG WITH
SHIP AND BUOY DATA DEPICT GENTLE TO MODERATE WINDS N OF 26N AND
MODERATE TRADES S OF 26N. SEAS OVER THE N PART OF THE AREA ARE IN
THE 4-5 FT RANGE AND 4-6 FT OVER THE SOUTHERN HALF OF THE FORECAST
AREA WITH 2-3 FT SEAS PREVAILING W OF THE BAHAMAS. AS THE TROPICAL
WAVE MOVES DUE SOUTH OF HIGH PRESSURE CENTER TODAY AND TONIGHT...A
LOCALLY TIGHTER PRESSURE GRADIENT WITH STRENGTHENING WINDS WILL
PREVAIL IN THE VICINITY OF THE TROPICAL WAVE S OF THE BAHAMAS.
WINDS WILL DIMINISH BELOW ADVISORY CRITERIA BY WED AFTERNOON AS
THE WAVE MOVES FURTHER FROM THE HIGH PRESSURE CENTER. THE TROPICAL
WAVE WILL CONTINUE TO SHIFT WESTWARD...AND WILL MOVE W OF THE AREA
FRIDAY.
 
$$

.WARNINGS...ANY CHANGES IMPACTING COASTAL NWS OFFICES WILL BE
COORDINATED THROUGH AWIPS 12 PLANET CHAT OR BY TELEPHONE:

.GULF OF MEXICO...
GMZ011...NONE.
GMZ013...NONE.
GMZ015...NONE.
GMZ017...NONE.
GMZ019...NONE.
GMZ021...NONE.
GMZ023...NONE.
GMZ025...NONE.

.CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN
55W AND 64W...
AMZ011...NONE.
AMZ013...NONE.
AMZ015...NONE.
AMZ017...NONE.
AMZ019...NONE.
AMZ021...NONE.
AMZ023...NONE.
AMZ025...NONE.
AMZ027...NONE.
AMZ029...NONE.
AMZ031...NONE.
AMZ033...NONE.
AMZ035...NONE.
AMZ037...NONE.
AMZ039...NONE.

.SW N ATLANTIC INCLUDING THE BAHAMAS...
AMZ111...NONE.
AMZ113...NONE.
AMZ115...NONE.
AMZ117...NONE.
AMZ119...NONE.
AMZ121...NONE.
AMZ123...NONE.
AMZ125...NONE.
AMZ127...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.HURRICANES.GOV/MARINE

$$
.FORECASTER AL. NATIONAL HURRICANE CENTER.