000 AGXX40 KNHC 090730 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 230 AM EDT MON JUN 09 2008 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. GULF OF MEXICO...WEAK TROUGH ALONG SRN MEXICO AND STUBBORN ATLC RIDGE ACROSS NRN GULF MAINTAIN STEADY SE WIND FLOW ACROSS MOST GULF OF MEXICO. PRES GRADIENT BETWEEN THEM RELAXING AS RIDGE WEAKENS THROUGHOUT FORECAST PERIOD DIMINISHING WINDS BELOW 20 KT. RETURN FLOW SHOULD PICK UP AGAIN BY LATE THU OR FRI AS PRES DROPS OVER CENTRAL TEXAS IN RESPONSE TO DEEP LAYER TROUGH APPROACHING FROM THE ROCKIES. TRPCL WAVE CREST MOVE W THROUGH BAY OF CAMPECHE TODAY AND TONIGHT S OF 23N HAS PLENTY OF MOISTURE AVAILABLE FOR CONVECTION AND ENTERING A LASS ADVERSE UPPER LEVEL ENVIRONMENT WHICH COULD NOW ENHANCE INTENSIFICATION...BUT WOULD BE MOSTLY OVER INLAND MEXICO. SW N ATLC...HIGH PRES 1020 MB 31N69W SHIFT SE TO ALONG 28N COVERING MOST OF SW N ATLC WITH LIGHT E-SE WARM MOIST FLOW. UPPER LEVEL CYCLONIC VORTEX THAT HAS BEEN APPROACHING FLORIDA E COAST FINALLY BRINGING ITS WATER CONTENT UNTO PENINSULA WITH THE UNSTABLE AIR MASS CONDUCIVE TO SOME MUCH-NEEDED RAINFALL. DIFFLUENT FLOW ALOFT SHOULD ENHANCE CONVECTION OVER BAHAMAS AND LATE IN THE AFTERNOON OR EVENING OVER FLORIDA. ELSEWHERE IN BASIN...DRY AIR MASS AND HIGH PRES RIDGE WILL KEEP OFFSHORE WATERS WITH LIGHT TO MODERATE WINDS...LITTLE CONVECTION AND SLIGHT SEAS. CARIBBEAN AND TRPCL ATLC...TRPCL WAVE ALONG 72W MOVING W AT 15 KT TO REACH 75W TONIGHT...81W TUE AND OVER GULF OF HONDURAS WED. WAVE REMAINS UNDER MOISTURE UMBRELLA MADE BY ATLC UPPER LEVEL CYCLONIC VORTEX SO WIDESPREAD CONVECTION IS NOT RULED OUT. SECOND TRPCL WAVE ION CENTRAL ATLC ALONG 43W MOVING W AT 15 KT REACH ALONG 55W TUE NIGHT...ENTER E CARIBBEAN LATE WED NIGHT... AND ALONG 70W FRI. THIS WAVE APPROACHES UPPER LEVEL ENVIRONMENT FAVORABLE FOR DEVELOPMENT OF DEEP CONVECTION AS IT APPROACH ERN CARIBBEAN. TRADE WINDS ALONG CARIBBEAN DIMINISHING AS ATLC HIGH PRES WEAKENS...BUT LIKELY TO BUILD UP AGAIN LATE IN FORECAST PERIOD AS SECOND TRPCL WAVE ENTERS BASIN. WARNINGS... ATLANTIC... NONE. CARIBBEAN... NONE. GULF OF MEXICO... NONE. .FORECASTER WALLY BARNES. TROPICAL PREDICTION CENTER.