000 AGXX40 KNHC 260511 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 130 AM EDT SAT MAY 26 2007 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. TWO LARGE MID LEVEL RIDGES DOMINATE THE ATLC REGION TONIGHT..ONE ALONG 38W THE OTHER ALONG 80W. IN BETWEEN A CLOSED UPPER LOW SITS N OF THE AREA NEAR 44N53W AND NEARLY STATIONARY. WEAK MID LEVEL IMPULSES ARE ROTATING AROUND THE WRN RIDGE THEN SEWD AROUND THE LOW'S PERIMETER. ONE IMPULSE HAS BEEN CAUGHT BY THE WRN RIDGE AND PULLED WWD NEAR 27N83W. ON THE SURFACE TONIGHT A 1026 MB HIGH WAS NEAR 31N74W WITH STRONG NE AND E WINDS S OF 28N AND W OF A STATIONARY FRONT. THE FRONT EXTENDS FROM 31N50W TO NEAR PUERTO RICO. LATER DAY 1 THE UPPER LOW N OF THE AREA IS FORECAST TO LIFT NE WHILE THE MID LEVEL RIDGES HOLD FIRM. ON THE SURFACE LATER DAY 1 GUSTY NE WINDS ARE EXPECTED TO CONTINUE OVER THE SW ATLC W OF THE FRONT. GULF WINDS MOSTLY 15 TO 20 KT AS WELL AS ERN CARIB. TROPICAL ATLC ELY TRADES 20 KT. FOR DAY 2 SOME RESIDUAL MID LEVEL TROUGHING CONTINUES BETWEEN 60W AND 80W WHERE WEAK IMPULSES GET LEFT BEHIND FROM THE DEPARTING UPPER LOW. THE MID LEVEL RIDGE ALONG 80W SHOWS SIGNS OF WEAKENING AS MID LEVEL TROUGHING DEVELOPS OVER THE SRN PLAINS. MID LEVEL RIDGING OVER THE E CENTRAL ATLC BECOMES ORIENTED MOVE ENE TO WSW AS THE WLY FLOW N OF 37N FLATTENS THE RIDGE. ON THE SURFACE DAY 2 THE GFS MODEL SHOWS CYCLOGENESIS BEGINNING TO TAKE PLACE E OF THE BAHAMAS BENEATH THE MID LEVEL TROUGH. ANOTHER WEAK LOW CENTER TRIES TO FORM OVER THE W CENTRAL CARIB FROM WHAT COULD BE AN OLD TROUGH IN THE AREA. OUTLOOK PERIOD... FOR DAY 3 THE PROCESS OF MID LEVEL RIDGE WEAKENING CONTINUES. WEAK IMPULSES OF VORTICITY IN THE WLY FLOW N OF 37N CONTINUE TO ERODE THE RIDGES WITH MID LEVEL TROUGHS DEVELOPING OVER THE NW GULF..ALONG 70W AND 40W. MID LEVEL RIDGING SINKS SWD TO OVER THE CARIB AND TROPICAL ATLC. ON THE SURFACE DAY 3 WITH LITTLE TO SUPPORT FURTHER DEVELOPMENT..THE GFS WEAKENS THE SURFACE LOW TO A TROUGH ALONG 31N63W TO 23N70W. EVEN THE CARIB LOW WEAKENS BACK TO A TROUGH. STRONGEST WINDS ARE OVER THE ATLC S OF 20N E OF 55W THANKS TO A 1028 MB HIGH OVER THE CENTRAL ATLC. FOR DAY 4 THE MID LEVEL PATTERN REMAINS PROGRESSIVE WITH FAIRLY STRONG SHORTWAVES IN THE NRN BRANCH OF THE WESTERLIES MOVING EWD. ONE DIVES SE OFF THE NEW ENGLAND COAST LOWERING MID LEVEL HEIGHTS BETWEEN 55W AND 70W. MID LEVEL RIDGING BUILDS NWD ALONG 85W IN ADVANCE OF ANOTHER STRONG SHORTWAVE OVER THE NRN ROCKIES. OTHERWISE FLAT MID LEVEL RIDGES COVER THE WRN CARIB AND TROPICAL ATLC. ON THE SURFACE DAY 4 WHATS LEFT OF A TROUGH OVER THE ATLC LIFTS NE ALONG 31N62W 24N68W. WINDS REMAIN LIGHT TO MODERATE W OF 65W AND MODERATE OVER THE ATLC S OF 22N E OF 55W. FOR DAY 5 MID LEVEL HEIGHTS CONTINUE FALLING SLOWLY E OF 70W AS THE STRONG SHORTWAVE MOVES ESE. MID LEVEL RIDGING OVER THE ERN CONUS DRIFTS EWD TO 80W WHILE A STRONG SHORTWAVE MOVES INTO THE NRN PLAINS AND CLOSES OFF. ON THE SURFACE DAY 5 THE PATTERN CONTINUES IT'S WEAKENING TREND. WHATS LEFT OF A TROUGH OVER THE W ATLC DRIFTS E TO 31N60W 23N66W. LITTLE CHANGE TO WINDS WITH MOST AREAS LIGHT TO MODERATE. ATLC TRADES REMAIN 20 KT S OF 20N E OF 60W. WARNINGS... ATLANTIC... NONE. CARIBBEAN... NONE. GULF OF MEXICO... NONE. FORECASTER RRG