000
AGXX40 KNHC 181839
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
240 PM EDT SAT SEP 18 2010

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

GULF OF MEXICO...
WITH TROUGHING LINGERING OVER THE WESTERN GULF IN THE WAKE OF 
KARL...A TIGHT PRESSURE GRADIENT REMAINS ACROSS THE WESTERN PART 
OF THE AREA WITH FRESH TO STRONG WINDS PREVAILING. A WEAKER 
PRESSURE GRADIENT IS ACROSS THE EASTERN GULF WITH MODERATE WINDS 
PREVAILING. WITH THE FRESH TO STRONG WINDS LINGERING OVER THE 
WESTERN GULF...SEAS IN THE 4 TO 6 FT RANGE REMAIN...WITH SEAS OF 
3 TO 4 FT OVER THE EASTERN GULF. RIDGING WILL REMAIN OVER THE 
GULF COAST STATES DURING THE PERIOD WHILE TROUGHING WILL PREVAIL 
OVER THE WESTERN GULF. 

SW N ATLC...
HURRICANE IGOR WAS LOCATED NEAR 26.0N 63.6W AT 1100 AM AST WITH 
HURRICANE AND TROPICAL STORM FORCE WINDS IMPACTING THE E PORTION 
OF THE FORECAST WATERS. WINDS AND SEAS WILL CONTINUE TO INCREASE 
AND BUILD SPREADING INTO THE W PORTION THIS WEEKEND WITH VERY 
LARGE SWELLS IMPACTING THE SE U.S. COAST AND THE BAHAMAS. 
CONDITIONS WILL CONTINUE TO DETERIORATE IN BERMUDA THIS WEEKEND 
WITH THE CIRCULATION CENTER EXPECTED TO PASS NEARLY DIRECTLY 
OVER BERMUDA SUN NIGHT. IGOR WILL MOVE N OF THE AREA LATE SUN 
NIGHT INTO MON ALTHOUGH LARGE SWELLS WILL LINGER ACROSS THE 
WATERS THROUGH MID WEEK. ATLC RIDGING WILL BUILD IN THE WAKE OF 
IGOR.

TROPICAL N ATLC AND CARIBBEAN SEA...
AS JULIA AND IGOR CONTINUE TO MOVE N...SURFACE RIDGING WILL 
BUILD BACK ACROSS THE TROPICAL N ATLC THIS WEEKEND. WITH JULIA 
CONTINUING TO WEAKEN...AND IGOR SHIFTING N OF THE AREA LATE SUN 
NIGHT/EARLY MON...THE SURFACE RIDGE WILL SHIFT N IN THEIR 
WAKE...WITH A RETURN TO A MORE TYPICAL TRADEWIND FLOW ACROSS THE 
TROPICAL N ATLC EARLY NEXT WEEK.  

IN THE CARIBBEAN SEA...A WEAK AND ILL-DEFINED PRESSURE PATTERN 
WILL REMAIN IN PLACE OVER THE MAJORITY OF THE CARIBBEAN SEA 
THROUGH MONDAY. HURRICANE IGOR WILL SHIFT N OF THE SW N ATLC 
LATE SUN NIGHT/EARLY MON...AND WILL ACCELERATE NE RAPIDLY. HIGH 
PRESSURE WILL BUILD IN ACROSS THE SW N ATLC IN IGOR'S 
WAKE...WHICH WILL BRING A GRADUAL RETURN OF TRADES ACROSS THE 
CARIBBEAN BY TUE. 
 
WARNINGS...

SW N ATLC...
.HURRICANE WARNING N OF 23N E OF 70W.

CARIBBEAN...
.NONE.

TROPICAL N ATLC...
.NONE.
  
GULF OF MEXICO...
.NONE.

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

$$
FORECASTER AL