000 ABNT30 KNHC 011322 TWSAT MONTHLY TROPICAL WEATHER SUMMARY...CORRECTED NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 800 AM EDT SUN OCT 1 2006 CORRECTED TO SHOW ERNESTO AS A HURRICANE IN THE SUMMARY TABLE FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO... FOUR HURRICANES...FLORENCE...GORDON...HELENE...AND ISAAC DEVELOPED IN THE ATLANTIC BASIN DURING SEPTEMBER. ERNESTO... WHICH DEVELOPED IN AUGUST...WAS STILL A TROPICAL CYCLONE AS THE MONTH OF SEPTEMBER BEGAN. TWO OF THE HURRICANES...GORDON AND HELENE...BECAME MAJOR HURRICANES. OVERALL...NEAR NORMAL LEVELS OF TROPICAL CYCLONE ACTIVITY OCCURRED DURING SEPTEMBER. ERNESTO FORMED IN AUGUST AND MADE LANDFALL IN NORTH CAROLINA AT THE END OF THAT MONTH AS A STRONG TROPICAL STORM. IT WEAKENED INLAND AND BECAME A TROPICAL DEPRESSION OVER EASTERN VIRGINIA ON 1 SEPTEMBER. HOWEVER...THE COMBINATION OF THE DEPRESSION AND A LARGE HIGH PRESSURE SYSTEM TO ITS NORTH PRODUCED GALE FORCE WINDS OVER MANY AREAS NEAR THE COAST OF THE NORTHEASTERN UNITED STATES. ERNESTO LOST ITS TROPICAL CHARACTERISTICS EARLY ON 2 SEPTEMBER. THE SYSTEM MOVED SLOWLY NORTHWARD OVER PENNSYLVANIA AND NEW YORK AND WAS GRADUALLY ABSORBED INTO A FRONTAL SYSTEM DURING THE FOLLOWING COUPLE OF DAYS. FLORENCE ORIGINATED FROM A TROPICAL WAVE THAT LEFT THE COAST OF AFRICA ON 29 AUGUST...AND DEVELOPED INTO A TROPICAL DEPRESSION ON 3 SEPTEMBER ABOUT 1525 MILES EAST OF THE NORTHERN LEEWARD ISLANDS. THE SYSTEM INITIALLY MOVED WEST-NORTHWESTWARD AND CONTINUED THIS MOTION FOR THE NEXT FIVE DAYS. THE LARGE SYSTEM BECAME A TROPICAL STORM ON 5 SEPTEMBER. FLORENCE TURNED NORTHWESTWARD AND STRENGTHENED ON 9 SEPTEMBER...BECOMING A HURRICANE EARLY THE NEXT DAY ABOUT 360 MILES SOUTH OF BERMUDA. THE HURRICANE TURNED NORTHWARD...PASSING ABOUT 60 MILES WEST OF BERMUDA ON 11 SEPTEMBER WHILE AT ITS ESTIMATED PEAK INTENSITY OF 90 MPH. FLORENCE TURNED NORTHEASTWARD LATER THAT DAY...AND BECAME EXTRATROPICAL ON 12 SEPTEMBER ABOUT 600 MILES SOUTHWEST OF CAPE RACE NEWFOUNDLAND. AS A POWERFUL EXTRATROPICAL LOW...FLORENCE PASSED NEAR CAPE RACE ON 13 SEPTEMBER...THEN MOVED EASTWARD INTO THE OPEN NORTH ATLANTIC FOR SEVERAL DAYS. FLORENCE BROUGHT HURRICANE CONDITIONS TO BERMUDA...CAUSING WIDESPREAD POWER OUTAGES...MINOR DAMAGE...AND A FEW INJURIES. AS AN EXTRATROPICAL LOW...FLORENCE BROUGHT HURRICANE-FORCE WINDS TO SOUTHEASTERN NEWFOUNDLAND...WHERE MINOR DAMAGE WAS REPORTED AS WELL. GORDON FORMED FROM A TROPICAL WAVE THAT LEFT THE WEST COAST OF AFRICA ON 1 SEPTEMBER. AS THE WAVE MOVED WESTWARD FOR ABOUT A WEEK...DEVELOPMENT WAS HINDERED BY NEARBY HURRICANE FLORENCE. BY 9 SEPTEMBER...FLORENCE HAD MOVED FAR ENOUGH AWAY FROM THE WAVE TO ALLOW THE SYSTEM TO DEVELOP...AND THE FOLLOWING DAY A TROPICAL DEPRESSION FORMED ABOUT 525 EAST-NORTHEAST OF THE LEEWARD ISLANDS. THE DEPRESSION STRENGTHENED INTO A TROPICAL STORM ON 11 SEPTEMBER AND TURNED TOWARD THE NORTHWEST. LATE ON 12 SEPTEMBER...GORDON BECAME A HURRICANE AND STARTED MOVING TOWARD THE NORTH. IT INTENSIFIED RAPIDLY ON 13 SEPTEMBER AND REACHED ITS PEAK INTENSITY OF 120 MPH ABOUT 555 MILES EAST-SOUTHEAST OF BERMUDA. MOVING NORTHEASTWARD OVER THE CENTRAL ATLANTIC...GORDON MAINTAINED MAJOR HURRICANE STATUS FOR ABOUT A DAY. THE CYCLONE THEN STALLED OVER THE CENTRAL ATLANTIC FOR A COUPLE DAYS AND WEAKENED. AN UPPER-LEVEL TROUGH FINALLY ACCELERATED GORDON NORTHEASTWARD ON 17 SEPTEMBER. THE TROPICAL CYCLONE TURNED TOWARD THE EAST ON 19 SEPTEMBER AND STRENGTHENED...REACHING A SECOND PEAK INTENSITY OF 105 MPH ABOUT 630 MILES WEST OF THE AZORES. GORDON WEAKENED AND PASSED NEAR THE SOUTHERNMOST AZORES EARLY ON 20 SEPTEMBER...THEN WEAKENED TO A TROPICAL STORM BEFORE BECOMING EXTRATROPICAL LATE IN THE DAY. THE EXTRATROPICAL REMNANTS OF GORDON WERE ABSORBED BY A LARGER LOW ON THE NEXT DAY AND CONTRIBUTED TO HEAVY RAIN AND HIGH WINDS OVER PARTS OF WESTERN EUROPE AND THE BRITISH ISLES. HELENE DEVELOPED FROM A TROPICAL WAVE THAT EMERGED FROM THE COAST OF AFRICA ON 11 SEPTEMBER. LOCATED OVER THE FAR EASTERN ATLANTIC... THE TROPICAL WAVE ACQUIRED ENOUGH ORGANIZATION THE NEXT DAY TO BE CLASSIFIED AS A TROPICAL DEPRESSION. THE LARGE DEPRESSION PASSED ABOUT 200 MILES SOUTH OF THE CAPE VERDE ISLANDS BEFORE STRENGTHENING TO A TROPICAL STORM EARLY ON 14 SEPTEMBER. MOVING WEST-NORTHWESTWARD OVER THE TROPICAL ATLANTIC...HELENE GRADUALLY STRENGTHENED AND BECAME A HURRICANE ON 16 SEPTEMBER WHILE LOCATED ABOUT 1150 MILES EAST OF THE NORTHERN LEEWARD ISLANDS. THE NEXT DAY...THE HURRICANE SLOWED DOWN AND TURN NORTHWESTWARD WHILE CONTINUING TO INTENSIFY. HELENE BECAME A MAJOR HURRICANE ON 18 SEPTEMBER AND SHORTLY THEREAFTER REACHED AN ESTIMATED PEAK INTENSITY OF 125 MPH. ON 19 SEPTEMBER...THE HURRICANE MOVED WESTWARD BRIEFLY AND WEAKENED TO A CATEGORY 2 HURRICANE. HELENE THEN TURNED NORTHWARD ON 20 SEPTEMBER AHEAD OF A LARGE DEEP-LAYER TROUGH MOVING OFF THE EAST COAST OF THE UNITED STATES. HELENE PASSED ABOUT 525 MILES EAST OF BERMUDA EARLY ON 21 SEPTEMBER AND THEN TURNED EAST-NORTHEASTWARD OVER THE OPEN WATERS OF THE CENTRAL ATLANTIC. HELENE RETAINED HURRICANE STRENGTH UNTIL BECOMING EXTRATROPICAL ON 24 SEPTEMBER ABOUT 600 MILES WEST-NORTHWEST OF THE AZORES. THE EXTRATROPICAL LOW GRADUALLY WEAKENED AND PASSED NEAR NORTHWESTERN IRELAND AND SCOTLAND ON 27 SEPTEMBER. ISAAC DEVELOPED FROM A TROPICAL WAVE THAT EXITED THE COAST OF AFRICA ON 18 SEPTEMBER. THIS LARGE WAVE AND ASSOCIATED SHOWER AND THUNDERSTORM ACTIVITY WAS TRACKED FOR NINE DAYS AS IT MOVED WEST-NORTHWESTWARD ACROSS THE EASTERN ATLANTIC. ON 27 SEPTEMBER... THE SYSTEM ACQUIRED SUFFICIENT ORGANIZATION TO BE DESIGNATED AS A TROPICAL DEPRESSION ABOUT 810 MILES EAST-SOUTHEAST OF BERMUDA. THE DEPRESSION STRENGTHENED TO A TROPICAL STORM ON THE 28 SEPTEMBER AND BECAME A HURRICANE ABOUT 370 MILES EAST-SOUTHEAST OF BERMUDA ON 30 SEPTEMBER. AT MONTH'S END...ISAAC WAS MOVING NORTHWARD OVER THE CENTRAL ATLANTIC. SUMMARY TABLE NAME DATES MAX WIND DEATHS U.S. DAMAGE MPH $MILLION --------------------------------------------------------------- H ERNESTO 24 AUG-2 SEP 75 2 N/A H FLORENCE 3-12 SEP 90 0 0 H GORDON 10-20 SEP 120 0 0 H HELENE 12-24 SEP 125 0 0 H ISAAC 27 SEP- 85 0 0 -------------------------------------------------------------- NOTE...DATES BASED ON COORDINATED UNIVERSAL TIME (UTC) N/A...NOT AVAILABLE $$ FORECASTER BROWN/BEVEN/BLAKE/MAINELLI/KNABB/FRANKLIN
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Page last modified: Monday, 02-Oct-2006 12:50:49 UTC