000 AGXX40 KNHC 281814 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 230 PM EDT SAT JUN 28 2008 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. UPPER LEVEL... THERE HAS BEEN LITTLE CHANGE IN UPPER LEVEL PATTERN SINCE EARLIER IN THE WEEK. CYCLONIC VORTEX AT 22N68W IS EMBEDDED IN TROUGH FROM 24N65W ACROSS HISPANIOLA TO NW COLOMBIA. VERY DRY AIR MASS WITHIN 5 DEG EITHER SIDE OF TROUGH AXIS. TO THE E... HEALTHY ANTICYCLONE ANCHORED AT 13N53W FEEDS TRPCL MOISTURE TO TWO TRPCL WAVES...ONE ALONG 69W AND THE SECOND ALONG 53W. MODERATE CONVERGENCE ALOFT OVER WESTERNMOST WAVE CURTAIL ITS CHANCE OF DEVELOPMENT WHILE SECOND WAVE STILL REMAINS UNDER FAVORABLE CONDITIONS ALOFT FOR PLENTY OF DEEP CONVECTION. ANOTHER WELL ANCHORED ANTICYCLONE OVER GLFMEX AT 17N85W PREVENTS SHARP TROUGH FROM DIGGING TOO FAR SE FORCING IT TO REMAIN OVER CENTRAL MEXICO. CYCLONE ALSO FEED PLENTY OF MOISTURE TO TRPCL WAVE ALONG 95W AS IT MOVES W ACROSS MEXICAN GULF COAST. AT THE SURFACE... GULF OF MEXICO... WESTWARD MOVEMENT OF TRPCL WAVE ALONG 95W SHOULD SIGNIFICANTLY DECREASE SCATTERED CONVECTION THAT HAS PLAGUED BAY OF CAMPECHE LAST COUPLE OF DAYS. HIGH PRES RIDGE ALONG 27N MAINTAINS LIGHT TO MODERATE E-SE FLOW ACROSS GLFMEX THROUGH ENTIRE PERIOD WITH LITTLE CHANGE IN SIGHT THROUGH FORECAST PERIOD. RIDGE WEAKENS AS FRONTAL TROUGH MOVES ACROSS SERN GULF STATES BUT WIND FLOW AND SEA STATE CHANGE LITTLE. SW N ATLC... SFC RIDGE ALONG 29N DOMINATES REGION WITH LIGHT WINDS N OF 28N AND MODERATE TO STRONG EASTERLIES S OF 25N. RIDGE WEAKENS MON AND TUE AS FRONTAL TROUGH APPROACHES NW CORNER INCREASING SW WINDS TEMPORARILY N OF 30N AND SPREADING E...BUT RECOVERS BY WED. NEITHER OF TRPCL WAVES CROSSING CARIBBEAN EXPECTED TO SIGNIFICANTLY AFFECT SW N ATLC. CARIBBEAN AND TROPICAL N ATLC... STRONG TRADES CONTINUE ACROSS BASIN S OF 18N AS GRADIENT BETWEEN ATLC RIDGE AND LOW PRES 1008 MB OVER COLOMBIA REMAINS STEADY. WEAK TROPICAL WAVE NOW ALONG 69W MOVE INTO WRN CARIBBEAN SUN AND MON WITH LITTLE EFFECT OF WIND NOR SEAS. SECOND TRPCL WAVE NOW ALONG 53W S OF 14N ENTER TRPCL ATLC EARLY TONIGHT WITH PLENTY OF DEEP CONVECTION...DUE TO ITS SUPPLIED ABUNDANT TRPCL MOISTURE. WAVE EXPECTED TO CONTINUE MOVING W AT 15 KT WITH SLIGHT INCREASE IN WIND AND SEAS BY TIME IT REACHES CENTRAL AND WRN CARIBBEAN. WARNINGS... ATLANTIC... NONE. CARIBBEAN... NONE. GULF OF MEXICO... NONE. .FORECASTER WALLY BARNES. TROPICAL PREDICTION CENTER.