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Hurricane Tracking Center

Active Tropical Systems Basin Outlooks Satellite
September 2007 Eastern Pacific Monthly Summary
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000
ABPZ30 KNHC 011813
TWSEP 
MONTHLY TROPICAL WEATHER SUMMARY
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
800 AM PDT MON OCT 1 2007
 
FOR THE EASTERN NORTH PACIFIC...EAST OF 140 DEGREES WEST LONGITUDE..

THREE TROPICAL STORMS FORMED IN THE EASTERN NORTH PACIFIC DURING
SEPTEMBER...WITH TWO OF THESE STORMS BECOMING HURRICANES...BUT NONE
BECOMING MAJOR HURRICANES. THESE TOTALS ARE CLOSE TO THE LONG-TERM
SEPTEMBER AVERAGES OF THREE TROPICAL STORMS...TWO HURRICANES...AND
ONE MAJOR HURRICANE. HOWEVER...THE SEPTEMBER ACCUMULATED CYCLONE
ENERGY (ACE) INDEX...WHICH MEASURES THE COMBINED STRENGTH AND
DURATION OF NAMED STORMS AND HURRICANES...WAS ONLY ABOUT HALF OF
THE LONG-TERM AVERAGE...CONTINUING THE TREND OF NEAR-RECORD-LOW
ACTIVITY DURING THE EASTERN NORTH PACIFIC HURRICANE SEASON. SO
FAR...2007 IS THE SECOND QUIETEST SEASON (BASED ON RELIABLE RECORDS
SINCE 1971) BEHIND 1977 IN TERMS OF ACE. ALSO OCCURRING IN
SEPTEMBER WERE TROPICAL DEPRESSION GIL...WHICH DISSIPATED EARLY IN
THE MONTH...AND TROPICAL DEPRESSION THIRTEEN-E.

GIL FORMED IN AUGUST...AND AT THE BEGINNING OF SEPTEMBER IT WAS A
TROPICAL DEPRESSION WITH 30 KT MAXIMUM WINDS AND WAS LOCATED ABOUT
575 N MI WEST-SOUTHWEST OF THE SOUTHERN TIP OF BAJA CALIFORNIA. 
GIL DEGENERATED INTO A REMNANT LOW OVER COOLER WATERS ON 2
SEPTEMBER ABOUT 800 N MI WEST-SOUTHWEST OF THE SOUTHERN TIP OF BAJA
CALIFORNIA.

HENRIETTE FORMED DURING AUGUST...AND AS SEPTEMBER BEGAN IT WAS A
TROPICAL STORM WITH MAXIMUM WINDS OF 45 KT LOCATED ABOUT 120 N MI
WEST OF ACAPULCO MEXICO. THE STORM STEADILY STRENGTHENED ON 1
SEPTEMBER AND REACHED AN INTENSITY OF 60 KT EARLY THE NEXT DAY...AS
IT MOVED WEST-NORTHWESTWARD AND PARALLEL TO THE MEXICAN COAST.
HENRIETTE REMAINED JUST SHY OF HURRICANE STRENGTH FOR THE NEXT TWO
DAYS AS IT HEADED GENERALLY NORTHWESTWARD AND AWAY FROM THE COAST.
EARLY ON 4 SEPTEMBER HENRIETTE FINALLY REACHED HURRICANE STATUS AS
IT TURNED NORTH-NORTHWESTWARD TOWARD THE BAJA CALIFORNIA PENINSULA.
THE HURRICANE REACHED ITS PEAK INTENSITY OF 75 KT THAT MORNING
WHILE CENTERED ABOUT 75 N MI SOUTH-SOUTHEAST OF CABO SAN LUCAS
MEXICO. THE CENTER OF HENRIETTE MADE LANDFALL JUST EAST OF CABO SAN
LUCAS ON THE AFTERNOON OF 4 SEPTEMBER WITH MAXIMUM WINDS NEAR 70
KT. CONTINUING NORTH-NORTHWESTWARD...HENRIETTE EMERGED OVER THE
GULF OF CALIFORNIA EARLY ON 5 SEPTEMBER. THE BRIEF INTERACTION WITH
THE BAJA CALIFORNIA PENINSULA CAUSED SLIGHT WEAKENING...BUT
HENRIETTE REMAINED A HURRICANE THROUGHOUT MOST OF THAT DAY. IT MADE
ITS FINAL LANDFALL ALONG THE COAST OF MAINLAND MEXICO...NEAR
GUAYMAS...VERY LATE ON 5 SEPTEMBER. HENRIETTE WEAKENED QUICKLY OVER
LAND AND DISSIPATED OVER THE MOUNTAINS OF NORTHWESTERN MEXICO EARLY
ON 6 SEPTEMBER. MEDIA REPORTS INDICATE AT LEAST NINE FATALITIES IN
MEXICO ARE DIRECTLY ATTRIBUTABLE TO HENRIETTE. SIX OF THESE DEATHS
OCCURRED NEAR ACAPULCO DUE TO MUD SLIDES INDUCED BY HEAVY RAINS
WHILE THE CENTER OF HENRIETTE PASSED JUST OFFSHORE.

TROPICAL DEPRESSION THIRTEEN-E ORIGINATED FROM A TROPICAL WAVE THAT
MOVED WESTWARD FROM THE COAST OF AFRICA ON 27 AUGUST AND REACHED
THE EASTERN PACIFIC ON 7 SEPTEMBER.  THE WAVE MOVED WESTWARD WITH
LITTLE DEVELOPMENT UNTIL 18 SEPTEMBER...WHEN THE ASSOCIATED
THUNDERSTORM ACTIVITY BECAME BETTER ORGANIZED.  A TROPICAL
DEPRESSION FORMED ON 19 SEPTEMBER ABOUT 1070 N MI WEST-SOUTHWEST
OF THE SOUTHERN TIP OF BAJA CALIFORNIA.  THE CYCLONE MOVED SLOWLY
WESTWARD UNTIL IT WEAKENED TO A REMNANT LOW THE NEXT DAY ABOUT 1190
N MI WEST-SOUTHWEST OF THE SOUTHERN TIP OF BAJA CALIFORNIA.

IVO FORMED FROM A TROPICAL WAVE...AND BECAME A DEPRESSION ON 18
SEPTEMBER ABOUT 400 N MI SOUTH-SOUTHWEST OF MANZANILLO MEXICO. 
THE DEPRESSION BECAME A TROPICAL STORM EARLY THE NEXT DAY AS IT
MOVED WEST-NORTHWESTWARD...AND REACHED HURRICANE STRENGTH EARLY ON
20 SEPTEMBER.  ROUNDING THE PERIPHERY OF MID-LEVEL HIGH
PRESSURE...IVO TURNED NORTHWESTWARD AND THEN NORTHWARD...REACHING
ITS PEAK INTENSITY OF 70 KT LATE ON 20 SEPTEMBER...ABOUT 350 N MI
SOUTH-SOUTHWEST OF CABO SAN LUCAS.  IVO TURNED NORTH-NORTHEASTWARD
ON 21 SEPTEMBER AND BEGAN TO WEAKEN UNDER THE INFLUENCE OF WESTERLY
SHEAR.  IVO WEAKENED TO A TROPICAL STORM AND CONTINUED SLOWLY
TOWARD THE NORTH-NORTHEAST FOR THE NEXT COUPLE OF DAYS...BECOMING A
TROPICAL DEPRESSION EARLY ON 23 SEPTEMBER ABOUT 90 N MI WEST OF
CABO SAN LUCAS.  IVO TURNED EASTWARD AND DEGENERATED TO A REMNANT
LOW LATER THAT DAY ABOUT 80 N MI SOUTHWEST OF CABO SAN LUCAS.

JULIETTE FORMED FROM A TROPICAL WAVE THAT MOVED ACROSS CENTRAL
AMERICA ON 22 SEPTEMBER AND INTO THE EASTERN NORTH PACIFIC ON 23
SEPTEMBER. THE WAVE MOVED WESTWARD PRODUCING DISORGANIZED
THUNDERSTORMS DURING 24-26 SEPTEMBER. BY 27 SEPTEMBER...
THUNDERSTORM ACTIVITY BECAME BETTER ORGANIZED AND A LOW PRESSURE
AREA FORMED ABOUT 280 N MI SOUTH-SOUTHWEST OF MANZANILLO MEXICO.
THE SYSTEM CONTINUED TO GRADUALLY GAIN ORGANIZATION...AND A
TROPICAL DEPRESSION FORMED EARLY ON 29 SEPTEMBER ABOUT 480 N MI
SOUTH OF THE SOUTHERN TIP OF BAJA CALIFORNIA. THE DEPRESSION MOVED
NORTHWESTWARD AND STRENGTHENED TO A TROPICAL STORM LATER THAT DAY
WHILE CENTERED ABOUT 400 N MI SOUTH-SOUTHWEST OF THE SOUTHERN TIP
OF BAJA CALIFORNIA. ALTHOUGH UNDER THE INFLUENCE OF SOUTHERLY
VERTICAL SHEAR...JULIETTE SLOWLY STRENGTHENED AND REACHED ITS PEAK
INTENSITY OF 50 KT ON 30 SEPTEMBER.  CURRENTLY...JULIETTE IS
CENTERED ABOUT 310 N MI WEST OF THE SOUTHERN TIP OF BAJA CALIFORNIA
WITH MAXIMUM WINDS OF 45 KT.


SUMMARY TABLE

NAME             DATES         MAX WIND (KT)     DEATHS
-------------------------------------------------------
TS GIL          29 AUG-2 SEP        40
H  HENRIETTE    30 AUG-6 SEP        75                9
TD THIRTEEN-E   19-20 SEP           30
H  IVO          18-23 SEP           70
TS JULIETTE     29 SEP -            45
-------------------------------------------------------         

NOTE...DATES BASED ON COORDINATED UNIVERSAL TIME (UTC)
* UNKNOWN AT THIS TIME

$$

FORECASTER FRANKLIN/BEVEN/BLAKE/RHOME/KNABB/PASCH