000 AGXX40 KNHC 280454 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 130 AM EDT SAT JUL 28 2007 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. THE WESTERLIES CONTINUE TO MAKE AN IMPACT ON SRN LATITUDES TONIGHT. A LARGE AMPLITUDE TROUGH WITH AXIS ALONG 76W EXTENDED S TO CENTRAL FL WITH A SURGE OF COLD AIR DROPPING RAPIDLY SWD OVER THE MIDWEST TONIGHT. SHOULD BE INTERESTING DAY 1 AS THIS COLD AIR HEADS S. ANOTHER STRONG MID LEVEL TROUGH IS EXITING THE AREA ALONG 40W JUST N OF THE AREA. MID LEVEL RIDGING COVERS THE WRN GULF AND ATLC ALONG 30N E OF 50W. ON THE SURFACE TONIGHT TRPL WAVES REMAIN WEAK WITH ONES LOCATED ALONG 35W..50W..AND 80W. THE ATLC RIDGE IS ANCHORED BY A 1021 MB HIGH NEAR 30N40W WITH A WEAK RIDGE AXIS WWD TO 70W. WINDS OVER THE ENTIRE REGION MOSTLY LIGHT TO MODERATE. LATER DAY 1 LITTLE CHANGE TO THE OVERALL MID LEVEL PATTERN. A CUTOFF LOW OVER TX SLIDES SE TOWARD THE NW GULF WHILE THE ATLC RIDGE AT MID LEVELS REMAINS E OF 60W. ON THE SURFACE LATER DAY 1 THE HIGH 1022MB CENTER OF THE ATLC RIDGE SLIDES WWD TO 30N50W BUT ATLC TRADES REMAIN 10 TO 15 KT. CARIB WINDS 20 KT OVER CENTRAL SECTIONS WHERE A LITTLE GRADIENT EXISTS BETWEEN THE RIDGE AND COLOMBIAN LOW PRESSURE. GULF WINDS REMAINS LIGHT. FOR DAY 2 MID LEVEL PATTERN REMAINS STATIC WITH THE TROUGH ALONG 75W BLOCKED BY A LARGE AMPLITUDE RIDGE ALONG 50W. ON THE SURFACE DAY 2 THE ATLC RIDGE STRENGTHENS SOME TO 1024 MB AS THE CENTER CONTINUES MOVING WWD TO NEAR 31N53W. ATLC TRADES PICK UP SOME TO 15 TO 20 KT S OF THE RIDGE. CARIB WINDS INCREASE SOME WITH THE RIDGE SLIDING WWD. BUT GULF WINDS REMAIN LIGHT. OUTLOOK PERIOD... FOR DAY 3 THE MID ATLC RIDGE BEGINS TO WEAKEN SOME AT MID LEVELS ALLOWING THE LARGE AMPLITUDE TROUGH ALONG THE E COAST TO BEGIN TO LIFT NE BUT ONLY SLOWLY. A EQUALLY LARGE AMPLITUDE RIDGE COVERS THE PLAINS WHILE THE EMBEDDED MID LEVEL LOW CENTER SLIDES S TO NRN MEXICO. ON THE SURFACE DAY 3 THE ATLC RIDGE WEAKENS SOME BUT MAINTAINS NE TRADES E OF 60W TO 20 KT. CARIB WINDS RELAX TO 15 TO 20 KT WHILE GULF WINDS REMAIN LIGHT. FOR DAY 4 A NEW SHORTWAVE TROUGH DIVES THROUGH THE LARGE UPPER TROUGH ALONG THE E COAST LOWERING HEIGHTS WITH POSSIBLE CYCLOGENESIS OFF THE SE COAST. MID LEVEL EASTERLIES S OF 20N WITH EMBEDDED WEAK VORTICITY CENTERS MOVING W. ON THE SURFACE DAY 4 GFS MODEL SHOWS WEAK LOW PRES OFF THE CAROLINA COAST INCREASES SW WINDS N OF 27N W OF 70W TO 20 KT. GULF WINDS REMAIN LIGHT AND CARIB AND ATLC TRADES MOSTLY 15 KT. FOR DAY 5..THE FIRST DAY OF AUGUST..MID LEVEL TROUGHING HANGS BACK TO THE ERN GULF FROM THE OLD TROUGH THAT WAS OFF THE E COAST. MID LEVEL RIDGING OVER THE PLAINS WEAKENS AS A SHORTWAVE WORKS IT'S WAY INTO THE CENTRAL PLAINS. MID LEVEL RIDGES OVER THE ATLC CENTERED NEA 30N60W AND OVER THE ERN ATLC ATLC AT 33N35W. ON THE SURFACE DAY 5 WEAK LOW PRES FORMS OVER THE NE GULF WHICH INCREASES SLY WINDS OVER THE ATLC W OF 70W N OF 27N TO 20 KT. GULF WINDS REMAINS LIGHT. THE ATLC RIDGE SHOWS NEW LIFE WITH A CENTER OVER MID OCEAN NEAR 34N40W AND RIDGING WSW TO 25N70W. CARIB WINDS REMAIN NEAR 20 KT E OF 75W AND ATLC TRADES STRENGTHEN SOME E OF 45W TO 20 KT. WARNINGS... ATLANTIC... NONE. CARIBBEAN... NONE. GULF OF MEXICO... NONE. FORECASTER RRG