000 AGXX40 KNHC 271659 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 100 PM EDT THU APR 27 2006 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. UPPER LEVELS... LONGWAVE TROUGH IS EAST OF 85W WITH AN AXIS ALONG 78W. A LONGWAVE RIDGE IS WEST OF 85W WITH A RIDGE AXIS ALONG 98W. THE PATTERN WILL AMPLIFY AND MOVE EAST. BY MIDDAY SATURDAY A STRONG TROUGH WILL BE OVER THE ATLANTIC AREA WITH AN AXIS ALONG 70W... THE RIDGE WILL HAVE MOVED TO THE EASTERN GULF OF MEXICO AND WEAKENED SOME AND ANOTHER TROUGH IS WILL DEVELOP OVER TEXAS. BY MIDDAY SUNDAY THE ATLANTIC TROUGH WILL HAVE CHANGED LITTLE AND MOVED EAST WITH AN AXIS ALONG 66W...THE RIDGE WILL BE OVER FLORIDA AND THE TROUGH OVER TEXAS WILL HAVE MOVED EAST NORTHEAST AND BY OVER THE MISSISSIPPI VALLEY. BY MIDDAY MONDAY THE ATLANTIC TROUGH WILL HAVE MOVED NORTHEAST OF THE AREA AND THE RIDGE WILL HAVE MOVED OVER THE WESTERN PART OF THE ATLANTIC AREA AND WEAKENED. THE TROUGH OVER THE MISSISSIPPI VALLEY WILL HAVE WEAKENED ALSO. BY MIDDAY MONDAY A NEAR ZONAL FLOW PATTERN IS FORECAST NORTH OF 25N WITH A BROAD ANTICYCLONE CENTERED OVER THE NORTHWEST CARIBBEAN. THE PATTERN WILL CHANGE LITTLE TUESDAY WITH THE BROAD ANTICYCLONE CENTERED ALONG 17N AND EXTENDING FROM THE YUCATAN PENINSULA TO ACROSS THE LESSER ANTILLES AND OVER THE TROPICAL ATLANTIC. SURFACE... FRONTAL TROUGH OVER THE NORTHWEST PART OF THE ATLANTIC AREA WILL MOVE SLOWLY MOVE EAST AND DEVELOP. A LOW IS FORECAST TO FORM WITHIN THE FRONTAL TROUGH JUST NORTH OF THE AREA TONIGHT AND SLOWLY MOVE EAST NEAR 31N REACHING TO NEAR BERMUDA LATE SUNDAY. AS THE ASSOCIATED UPPER LEVEL TROUGH MOVES NORTHEAST THE SURFACE LOW WILL ALSO WITH A RIDGE DEVELOPING OVER THE AREA ALONG 27N THROUGH TUESDAY. THE STRONG WINDS IN THE ATLANTIC AREA WILL BE NEAR THE SURFACE FRONTAL TROUGH AND THE LOW NEAR 31N. A SURFACE LOW WILL DEVELOP OVER TEXAS ASSOCIATED WITH THE UPPER LEVEL TROUGH WITH INCREASING SOUTHERLY WINDS OVER THE WESTERN GULF OF MEXICO BEGINNING FRIDAY AND SPREADING EAST OVER THE ENTIRE GULF SATURDAY. AN ASSOCIATED COLD FRONT WILL MOVE OFF THE TEXAS COAST LATE SATURDAY WITH LIGHT WINDS BEHIND THE FRONT. AS THE UPPER TROUGH WEAKENS OVER THE EASTERN U.S. SUNDAY WINDS WILL ALSO DECREASE EAST OF THE FRONT AND BY MONDAY THE FRONT WILL HAVE BECOME DIFFUSE OVER THE EASTERN GULF OF MEXICO. TRADE WINDS IN THE CARIBBEAN AND TROPICAL ATLANTIC WILL CHANGE LITTLE THROUGH THE FORECAST PERIOD AND REMAIN LESS THAN NORMAL. WARNINGS... ATLANTIC... NONE. CARIBBEAN... NONE. GULF OF MEXICO... NONE. FORECASTER LL