000 ABPZ30 KNHC 011438 TWSEP MONTHLY TROPICAL WEATHER SUMMARY NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 800 AM PDT FRI SEP 1 2006 FOR THE EASTERN NORTH PACIFIC...EAST OF 140 DEGREES WEST LONGITUDE.. AUGUST WAS AN ACTIVE MONTH FOR TROPICAL CYCLONES IN THE EASTERN NORTH PACIFIC WITH FOUR NAMED STORMS DEVELOPING. ADDITIONALLY... TROPICAL STORMS FABIO AND GILMA WHICH FORMED ON THE LAST DAY OF JULY REMAINED TROPICAL CYCLONES DURING THE FIRST FEW DAYS OF AUGUST. FOUR OF THE NAMED STORMS BECAME HURRICANES WITH ILEANA AND JOHN BECOMING MAJOR HURRICANES. FABIO FORMED FROM A TROPICAL WAVE THAT EMERGED FROM THE COAST OF AFRICA ON 15 JULY AND CROSSED CENTRAL AMERICA ON 23 JULY. CONVECTION BEGAN TO INCREASE ALONG THE WAVE ON 28 JULY AT WHICH TIME A WEAK AREA OF LOW PRESSURE FORMED APPROXIMATELY 500 N MI SOUTHWEST OF MANZANILLO MEXICO. SHOWERS AND THUNDERSTORMS ASSOCIATED WITH THE LOW SLOWLY ORGANIZED OVER THE NEXT THREE DAYS AS IT MOVED NORTHWESTWARD...AND BY 31 JULY THE SYSTEM ACQUIRED SUFFICIENT DEEP CONVECTION TO BE DESIGNATED AS A TROPICAL DEPRESSION ABOUT 975 N MI SOUTHWEST OF THE SOUTHERN TIP OF BAJA CALIFORNIA. THE CYCLONE BECAME THE SIXTH TROPICAL STORM OF THE SEASON 6 HOURS LATER AND REACHED ITS PEAK INTENSITY OF 45 KT ON 1 AUGUST. AS FABIO MOVED WESTWARD UNDER THE INFLUENCE OF A MID-TROPOSPHERIC RIDGE TO THE NORTH...THE CYCLONE WAS AFFECTED BY INCREASING EASTERLY VERTICAL SHEAR AND A MORE STABLE AIRMASS. THESE ENVIRONMENTAL FACTORS ULTIMATELY RESULTED IN THE CYCLONE WEAKENING BACK TO A DEPRESSION ON 3 AUGUST ABOUT 1400 N MI EAST OF HILO HAWAII. FABIO DEGENERATED INTO A REMNANT LOW ON 4 AUGUST AND CONTINUED WESTWARD...BECOMING AN OPEN WAVE BY 6 AUGUST. GILMA DEVELOPED FROM A TROPICAL WAVE THAT MOVED OFF THE WEST COAST OF AFRICA ON 17 JULY. IT ENTERED INTO THE EASTERN NORTH PACIFIC OCEAN ON 25 JULY WITH CONVECTION INCREASING ON 29 JULY. BY 1 AUGUST...THE SYSTEM HAD ACQUIRED ENOUGH DEEP CONVECTION AND SUFFICIENT ORGANIZATION TO BE CONSIDERED A TROPICAL DEPRESSION ABOUT 360 N MI SOUTHWEST OF ACAPULCO MEXICO. DESPITE MODERATE EASTERLY SHEAR...THE DEPRESSION STRENGTHENED TO A TROPICAL STORM ON 1 AUGUST. GILMA WAS A SHORT-LIVED TROPICAL STORM AND PERSISTENT EASTERLY SHEAR PREVENTED FURTHER INTENSIFICATION. BY 2 AUGUST THE LOW-LEVEL CENTER BECAME COMPLETELY EXPOSED AND GILMA WEAKENED TO A TROPICAL DEPRESSION. GILMA DEGENERATED TO A REMNANT LOW ON 4 AUGUST ABOUT 375 N MI WEST-SOUTHWEST OF MANZANILLO. THE LOW DISSIPATED ON 5 AUGUST ABOUT 325 N MI SOUTH-SOUTHWEST OF THE SOUTHERN TIP OF BAJA CALIFORNIA. HECTOR FORMED FROM A TROPICAL WAVE THAT EXITED THE WEST COAST OF AFRICA ON 31 JULY AND REACHED THE EASTERN PACIFIC OCEAN ON 10 AUGUST. SHOWER ACTIVITY GRADUALLY INCREASED AS THE WAVE PASSED SOUTH OF THE GULF OF TEHUANTEPEC AND A BROAD LOW PRESSURE AREA DEVELOPED ABOUT 425 N MI SOUTH OF ACAPULCO ON 13 AUGUST. THE SYSTEM CONTINUED TO GAIN ORGANIZATION AND A TROPICAL DEPRESSION FORMED ON THE 15TH ABOUT 750 N MI SOUTHWEST OF MANZANILLO. MOVING WEST- NORTHWESTWARD...THE DEPRESSION QUICKLY ACHIEVED TROPICAL STORM STRENGTH AND INTENSIFIED INTO A HURRICANE ON THE 17TH. WHILE LOCATED ABOUT 1150 N MI SOUTHWEST OF THE SOUTHERN TIP OF BAJA CALIFORNIA...IT IS ESTIMATED THAT HECTOR REACHED PEAK INTENSITY OF 90 KT...CATEGORY 2 ON THE SAFFIR-SIMPSON HURRICANE SCALE...ON THE 18TH. HECTOR CONTINUED WEST-NORTHWEST TO NORTHWESTWARD REACHING COOLER WATERS ON THE 20TH AND WEAKENED BELOW HURRICANE STRENGTH. DESPITE PASSING OVER COOLER WATERS...THE CYCLONE CONTINUED TO PRODUCE CONVECTION AND TROPICAL STORM FORCE WINDS FOR ANOTHER TWO DAYS. HECTOR TURNED WESTWARD AND LOST MOST OF ITS DEEP CONVECTION ON THE 22ND...THEN FINALLY WEAKENED INTO A DEPRESSION EARLY ON THE 23RD. THE REMNANT LOW CONTINUED WESTWARD AND DISSIPATED ABOUT 1150 N MI EAST OF THE HAWAIIAN ISLANDS ON THE 24TH. ILEANA FORMED ON 21 AUGUST ABOUT 300 N MI SOUTH-SOUTHWEST OF ACAPULCO FROM A WESTWARD-MOVING TROPICAL WAVE THAT HAD EMERGED INTO THE EASTERN NORTH PACIFIC SEVERAL DAYS EARLIER. LATER THAT DAY... THE CYCLONE STRENGTHENED INTO A TROPICAL STORM AS IT MOVED WEST-NORTHWESTWARD. ILEANA BECAME A HURRICANE ON 22 AUGUST...AND STRENGTHENED TO AN ESTIMATED PEAK INTENSITY OF 105 KT...CATEGORY 3 STATUS...ON 23 AUGUST. THE HURRICANE THEN TURNED NORTHWESTWARD WHILE A GRADUAL WEAKENING TREND COMMENCED. ILEANA TURNED BACK TO THE WEST-NORTHWEST AND BECAME A TROPICAL STORM ON 26 AUGUST. THE SYSTEM WEAKENED TO A DEPRESSION ON 27 AUGUST AND DETERIORATED INTO A LARGE REMNANT LOW LATER THAT DAY. THE LOW DRIFTED GENERALLY WESTWARD FOR A FEW DAYS BEFORE LOSING ITS IDENTITY. JOHN ORIGINATED FROM AN AREA OF DISTURBED WEATHER ASSOCIATED WITH A TROPICAL WAVE THAT ENTERED THE EASTERN NORTH PACIFIC ON 25 AUGUST AND ALMOST IMMEDIATELY SHOWED SIGNS OF ORGANIZATION. HOWEVER...THE SYSTEM DID NOT DEVELOP INTO A TROPICAL DEPRESSION UNTIL 28 AUGUST WHILE CENTERED ABOUT 340 N MI SOUTHEAST OF ACAPULCO. THE CYCLONE QUICKLY STRENGTHENED INTO A TROPICAL STORM. JOHN MOVED WEST- NORTHWESTWARD...PARALLELING THE COAST OF MEXICO. THE STORM INTENSIFIED INTO A HURRICANE ON 29 AUGUST AND RAPIDLY STRENGTHENED INTO A CATEGORY 3 HURRICANE THAT SAME DAY WHILE CENTERED ABOUT 140 N MI SOUTH OF ACAPULCO. JOHN REACHED CATEGORY 4 STRENGTH ON 30 AUGUST BUT WEAKENED TO CATEGORY 2 STATUS ON 31 AUGUST WHILE CONTINUING TO MOVE ROUGHLY PARALLEL...BUT CLOSER TO...THE SOUTHWEST COAST OF MEXICO. ALTHOUGH THE EYE REMAINED OFFSHORE... JOHN'S CIRCULATION AFFECTED THE COAST OF MAINLAND MEXICO WITH VERY HEAVY RAINS AND STRONG WINDS. THERE WAS SIGNIFICANT STORM SURGE FLOODING IN ACAPULCO DUE TO JOHN. AT MONTH'S END...JOHN WAS MOVING NORTHWESTWARD TOWARD THE SOUTHERN TIP OF BAJA CALIFORNIA. KRISTY FORMED ON 30 AUGUST...ABOUT 450 N MI WEST-SOUTHWEST OF THE SOUTHERN TIP OF BAJA CALIFORNIA...FROM A MASS OF CLOUDINESS AND SHOWERS ASSOCIATED WITH A TROPICAL WAVE. KRISTY BECAME A TROPICAL STORM THAT SAME DAY WHILE MOVING SLOWLY NORTHWESTWARD. IT STRENGTHENED INTO A HURRICANE EARLY ON 31 AUGUST AND CONTINUED TO HEAD SLOWLY NORTHWESTWARD. AT MONTH'S END...KRISTY WAS MOVING SLOWLY WESTWARD THROUGH THE OPEN PACIFIC ABOUT 490 N MI WEST-SOUTHWEST OF THE SOUTHERN TIP OF BAJA CALIFORNIA. SUMMARY TABLE NAME DATES MAX WIND (KT) DEATHS ------------------------------------------------------------------- TS FABIO 31 JUL-3 AUG 45 0 TS GILMA 31 JUL-3 AUG 35 0 H HECTOR 15-23 AUG 90 0 H ILEANA 21-27 AUG 105 0 H JOHN AUG 28- 115 0 H KRISTY AUG 30- 65 0 ------------------------------------------------------------------- NOTE...DATES BASED ON COORDINATED UNIVERSAL TIME (UTC) $$ FORECASTER AVILA/BLAKE/BROWN/MAINELLI/PASCH/RHOME
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Page last modified: Saturday, 02-Sep-2006 19:23:46 UTC