000 ABPZ30 KNHC 011457 TWSEP MONTHLY TROPICAL WEATHER SUMMARY NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 800 AM PDT WED OCT 1 2008 FOR THE EASTERN NORTH PACIFIC...EAST OF 140 DEGREES WEST LONGITUDE.. OVERALL TROPICAL CYCLONE ACTIVITY DURING SEPTEMBER WAS THE LOWEST EVER RECORDED SINCE RELIABLE RECORDS BEGAN IN 1971. IN TERMS OF THE ACCUMULATED CYCLONE ENERGY INDEX (ACE)...SEPTEMBER 2008 HAD A VALUE OF ONLY 9% OF THE LONG-TERM AVERAGE. ONLY TWO TROPICAL STORMS WERE NOTED DURING THE MONTH AND THERE WERE NO HURRICANES. THE 1971-2007 AVERAGES ARE THREE TROPICAL STORMS...TWO HURRICANES...AND ONE MAJOR HURRICANE. KARINA WAS A SHORT-LIVED TROPICAL CYCLONE. A TROPICAL DEPRESSION FORMED 260 MILES SOUTH OF THE SOUTHERN TIP OF BAJA CALIFORNIA EARLY ON 2 SEPTEMBER FROM A PERSISTENT AREA OF DISTURBED WEATHER. KARINA WAS EMBEDDED WITHIN A STRONG SHEARING ENVIRONMENT...ALTHOUGH IT WAS ABLE TO REACH AN INTENSITY OF 40 MPH LATE ON 2 SEPTEMBER. THEREAFTER...THE SHEAR INCREASED FURTHER AND KARINA DEGENERATED TO A REMNANT LOW LATE ON THE THE THIRD OF SEPTEMBER. LOWELL FORMED FROM A STRONG TROPICAL DISTURBANCE EARLY ON 7 SEPTEMBER WHILE IT WAS LOCATED ABOUT 265 MILES SOUTH-SOUTHWEST OF MANZANILLO MEXICO. DESPITE BEING UNDER THE INFLUENCE OF NORTHEASTERLY SHEAR...THE STORM GRADUALLY STRENGTHENED OVER THE NEXT DAY AND REACHED A PEAK INTENSITY OF 60 MPH WHEN IT WAS LOCATED ABOUT 325 MILES SOUTH OF THE SOUTHERN TIP OF BAJA CALIFORNIA. LOWELL CONTINUED TO MOVE NORTHWESTWARD WELL OFF THE COAST OF MEXICO BUT STARTED TO WEAKEN ON 9 SEPTEMBER AS IT BEGAN TO INGEST STABLE AIR AND REMAINED UNDER THE INFLUENCE OF NORTHEASTERLY SHEAR. THE CYCLONE ULTIMATELY WEAKENED TO A TROPICAL DEPRESSION ON 10 SEPTEMBER AND TURNED SLOWLY TO THE NORTHEAST IN RESPONSE TO A MID-LATITUDE TROUGH TO ITS NORTH. LOWELL MADE LANDFALL OVER THE FAR SOUTHERN BAJA PENINSULA EARLY ON 11 SEPTEMBER...MOVED ACROSS THE GULF OF CALIFORNIA...THEN DISSIPATED ALONG THE COAST OF MAINLAND MEXICO NEAR LOS MOCHIS EARLY ON 12 SEPTEMBER. ALTHOUGH NO DEATHS HAVE BEEN REPORTED...HEAVY RAINFALL AND FLOODING FROM THE REMNANTS OF LOWELL LEFT MORE THAN 26500 PEOPLE HOMELESS IN THE MEXICAN STATES OF MICHOACAN...SONORA...AND SINALOA. SUMMARY TABLE NAME DATES MAX WIND (MPH) DEATHS ----------------------------------------------------------------- TS KARINA 2-3 SEP 40 0 TS LOWELL 7-12 SEP 60 0 ------------------------------------------------------------------- NOTES...DATES BASED ON COORDINATED UNIVERSAL TIME (UTC) $$ HURRICANE SPECIALISTS UNIT
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