000 AGXX40 KNHC 030806 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 327 AM EDT FRI APR 03 2009 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. UPPER LEVELS... STRONG SHORTWAVE TROUGH ROUNDING BASE OF LONGWAVE OVER EASTERN CONUS SUPPORTS COLD FRONT PRESENTLY ACROSS CENTRAL GULF OF MEXICO. SHORTWAVE PULLS RAPIDLY NE FRI WEAKENING FRONT AS IT CROSSES SW N ATLC. PATTERN REPEATS ITSELF AS SECOND SHORTWAVE PRESENTLY OVER MIDWEST ROUNDS SLOW MOVING LONGWAVE SUPPORTING SECOND AND STRONGER COLD FRONT ENTERING NW GULF OF MEXICO SUN. UPPER LEVEL RIDGE WELL ANCHORED BY ANTICYCLONE OVER JAMAICA EXTENDS ACROSS SW N ATLC REMAINS UNMOVED BY SHORTWAVES SLIDING NE MAINTAINING MOISTURE N OF 27N. ENTIRE AREA S OF 27N REMAIN VERY DRY DUE TO SUBSIDING AIR MASS UNDER RIDGE INHIBITING ANY SIGNIFICANT CONVECTION ACROSS ENTIRE CARIBBEAN. MOST TROPICAL MOISTURE EMERGING FROM SOUTH AMERICA EVAPORATES UPON REACHING N OF 10N. ELSEWHERE AT THE SURFACE... GULF OF MEXICO... COLD FRONT ACROSS CENTRAL SECTIONS OF GULF FROM 30N85W TO 19N95W EXITS BASIN SAT. LACK OF NOTICEABLE HIGH PRES RIDGE BEHIND FRONT ALLOWS WINDS TO VEER IMMEDIATELY SE AND S AS SECOND STRONGER FRONT APPROACHES COAST OF TEXAS. HEALTHY HIGH PRES RIDGE 1032 MB BEHIND SECOND FRONT BRINGS VERY STRONG N WINDS WITH GUSTS TO GALE FORCE MAINLY W OF 93W. SECOND FRONT EXITS GULF LATE MON OR EARLY TUE. HIGH PRES ANTICYCLONIC FLOW ENHANCES SOUTHERLY RETURN FLOW W OF 90W. SW N ATLC... STRONG SOUTHERLY FLOW AHEAD OF APPROACHING COLD FRONT PRESENTLY OVER GULF OF MEXICO. FRONT WEAKENS AS IT CROSSES SW N ATLC AS UPPER SUPPORT SHIFT NE AND DIMINISHES N WINDS SUN. SOUTHERLY WINDS INCREASE SUN NIGHT AND MON WITH GUST TO GALE FORCE N OF 27N AND SPREADING E ACROSS BASIN THROUGH WED. CARIBBEAN SEA... WITH UPPER RIDGE PREVENTING ENCROACHING OF COLD FRONT INTO BASIN AND SURFACE RIDGE FORCED FURTHER E BY SEQUENCE OF COLD FRONT CROSSING SW N ATLC...CARIBBEAN WINDS ENJOY A RESPITE OF ITS STRONG TRADE WINDS THROUGH WED. EVEN ITS PEAK WINDS ALONG COAST OF COLOMBIA ARE FORECAST TO SURPASS 25 KT...QUITE RARE AT THIS TIME OF THE YEAR. ATLC... NONE. CARIBBEAN... NONE. GULF OF MEXICO... NONE. FORECASTER WALLY BARNES. TROPICAL PREDICTION CENTER.