000
AGXX40 KNHC 201834
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
245 PM EDT TUE JUL 20 2010

MARINE WEATHER DISCUSSION FOR THE GULF OF MEXICO...CARIBBEAN SEA 
AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W.

GULF OF MEXICO...
TROPICAL WAVE ALONG 94W WILL MOVE W THROUGH THE SW GULF THIS 
AFTERNOON AND INLAND OVER MEXICO TONIGHT. SCATTERED SHOWERS AND 
TSTMS ARE WITHIN AROUND 90 NM EITHER SIDE OF AXIS S OF 22N. BUOY 
42055 REPORTED SE WINDS OF 15 KT AND SEAS TO 4 FT WITH THE WAVE 
PASSAGE. A ANOTHER TROPICAL WAVE ALONG 86W S OF 26N WILL MOVE 
THROUGH THE CENTRAL GULF THIS AFTERNOON AND TONIGHT AND THE 
WESTERN GULF WED. SEAS AREA EXPECTED TO BUILD TO 8 FT BEHIND THE 
WAVE AXIS IN ABOUT 24 HOURS. RIDGE ALONG 29N WILL MOVE N OF AREA 
WED AND REBUILD ALONG THE GULF COASTAL PLAIN FRI AND SAT. E-SE 
WINDS OF 15-20 KT WILL CONTINUE THROUGH THE STRAITS OF FLORIDA. 
OTHERWISE...E-SE WINDS OF 10-15 KT WILL CONTINUE ACROSS THE 
REMAINDER OF THE GULF WATERS BECOMING NE TO E BY FRI AS AN AREA 
OF LOW PRES...POSSIBLE A TROPICAL CYCLONE...APPROACHES SE 
FLORIDA. 

CARIBBEAN SEA AND TROPICAL N ATLC...
TROPICAL WAVE ALONG 86W WILL MOVE INLAND TONIGHT. E TO SE WINDS 
OF 15 TO 20 KR ARE NOTED BEHIND THE WAVE AXIS. AS THE WAVE 
CONTINUES TO MOVE WWD WINDS WILL INCREASE TO 20 KT ACROSS THE 
GULF OF HONDURAS TONIGHT. ANOTHER TROPICAL WAVE ALONG 72W WILL 
MOVE ACROSS THE CENTRAL CARIBBEAN THROUGH WED THEN INTO THE W 
CARIBBEAN THU THROUGH SAT. THIS WAVE WILL SLOW DOWN AND MOVE IN 
TANDEM WITH THE LOW PRES FORECAST TO DEVELOP NEAR THE SE 
BAHAMAS. A THIRD TROPICAL WAVE WELL E OF THE AREA WILL ENTER THE 
TROPICAL N ATLC WATERS BY FRI AND THE E CARIBBEAN SAT. E-SE 
WINDS TO 20 KT ARE N OF 18N IN THE TROPICAL N ATLC WATERS WITH 
THE EXCEPTION OF 20 TO 30 KT W OF 62W DUE THE PRESENCE OF THE 
DEVELOPING LOW PRES. OTHERWISE...LIGHTER THAN NORMAL TRADES 
ACROSS THE REMAINDER OF THE CARIBBEAN.

SW N ATLC...
ATLC HIGH PRES RIDGE ALONG 30N WILL LIFT N OF THE AREA WED 
AFTERNOON. NORTHERN PORTION OF A TROPICAL WAVE IS OVER THE SE 
BAHAMAS AND WILL CONTINUE TO MOVE WWD ACROSS THE CENTRAL 
CARIBBEAN THROUGH WED THEN INTO THE W CARIBBEAN THU THROUGH SAT. 
A SURFACE TROUGH EXTENDS FROM 23N64W TO THE MONA PASSAGE 
PRODUCING SCATTERED TO NUMEROUS SHOWERS WITH EMBEDDED TSTMS FROM 
THE NORTHERN LEEWARD ISLANDS WESTWARD TO HISPANIOLA. ALTHOUGH 
THE SYSTEM DOES NOT YET HAVE A CLOSED CIRCULATION...SATELLITE 
IMAGERY SUGGESTS THAT A SURFACE LOW PRESSURE AREA IS BECOMING 
BETTER DEFINED JUST NORTH OF THE EASTERN TIP OF HISPANIOLA. 
ENVIRONMENTAL CONDITIONS ARE EXPECTED TO BE FAVORABLE FOR 
ADDITIONAL DEVELOPMENT AS THE SYSTEM MOVES WEST-NORTHWESTWARD AT 
ABOUT 8 NM DURING THE NEXT DAY OR SO. THERE IS A HIGH CHANCE OF 
THIS SYSTEM BECOMING A TROPICAL DEPRESSION OR STORM DURING THE 
NEXT 48 HOURS. A WINDSAT PASS FROM THIS MORNING AND A COUPLE OF 
RECENT ASCAT PASSES SHOWED FRESH TO STRONG WINDS IN THE 20 TO 30 
KT S OF 25N E OF 62W WITH BUILDING SEAS IN THE 8 TO 12 FT RANGE 
E OF THE BAHAMAS AND NEAR THE DEVELOPING SURFACE LOW. THESE 
MARINE CONDITIONS ARE EXPECTED TO PERSIST DURING THE NEXT 3 DAYS 
AS THE LOW PRES MOVE NEAR THE BAHAMAS APPROACHING SE FLORIDA BY 
FRI.   

WARNINGS...
ATLC...
.NONE.

CARIBBEAN...
.NONE.

GULF OF MEXICO...
.NONE.

FOR ADDITIONAL INFORMATION PLEASE VISIT 
HTTP://WWW.HURRICANES.GOV/MARINE

$$
FORECASTER GR