ABPZ30 KNHC 011420

TWSEP 

MONTHLY TROPICAL WEATHER SUMMARY

NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL

8 AM PDT WED OCT 1 2004

 

FOR THE EASTERN NORTH PACIFIC...EAST OF 140 DEGREES WEST LONGITUDE..



...SUMMARY OF EAST PACIFIC TROPICAL CYCLONES FOR SEPTEMBER 2004...



TWO TROPICAL CYCLONES DEVELOPED DURING SEPTEMBER IN THE EASTERN

PACIFIC...HURRICANES ISIS AND JAVIER.  THIS IS BELOW THE

CLIMATOLOGICAL AVERAGE OF....IN ADDITION...HOWARD WHICH FORMED ON

30 AUGUST BECAME A HURRICANE IN SEPTEMBER.  



HOWARD FORMED ON THE AUGUST 30TH ABOUT 350 N MI SOUTHWEST OF

ACAPULCO MEXICO.  MOVING TO THE WEST-NORTHWEST...THE CYCLONE REACHED

TROPICAL STORM STRENGTH ON THE 31ST AND HURRICANE STRENGTH ON 1

SEPTEMBER.  HOWARD TURNED NORTHWESTWARD ON 2 SEPTEMBER AS IT

REACHED AS MAXIMUM SUSTAINED WINDS REACHED AN ESTIMATED 120 KT. 

HOWARD WEAKENED AND TURNED NORTH-NORTHWESTWARD ON THE 3RD.  IT

WEAKENED TO A TROPICAL STORM ON THE 4TH AND A TROPICAL DEPRESSION

ON THE 5TH.  THE CYCLONE DISSIPATED LATER THAT DAY ABOUT 5120 N MI

EAST-NORTHEAST OF CABO SAN LUCAS AT THE SOUTHERN END OF BAJA

CALIFORNIA.



ISIS FORMED AS A DEPRESSION ON 8 SEPTEMBER ABOUT 450 N MI SOUTH OF

CABO SAN LUCAS.  THE DEPRESSION MOVED WESTWARD AND BECAME A

TROPICAL STORM LATER THAT DAY AS IT TURNED TO THE NORTHWEST.  

STRONG NORTHEASTERLY SHEAR PREVENTED ADDITIONAL DEVELOPMENT...AND

ON 10 SEPTEMBER ISIS LOST ITS DEEP CONVECTION...TURNED

WESTWARD...AND WEAKENED BACK TO A TROPICAL DEPRESSION.  EASTERLY

SHEAR BEGAN TO DIMINISH...AND ISIS REGAINED TROPICAL STORM

STATUS ON 12 SEPTEMBER WHEN IT WAS ABOUT 725 N MI WEST-SOUTHWEST OF

CABO SAN LUCAS.  ISIS CONTINUED GENERALLY WESTWARD FOR THREE

DAYS...GRADUALLY STRENGTHENING...AND BRIEFLY ATTAINED HURRICANE

INTENSITY WHILE MOVING NORTHWESTWARD ON 15 SEPTEMBER ABOUT 1250 N

MI WEST-SOUTHWEST OF CABO SAN LUCAS.  ISIS HAD MOVED OVER COOL

WATERS WHEN STEERING CURRENTS COLLAPSED ON 15 SEPTEMBER.  ISIS

MOVED LITTLE OVER THE NEXT COUPLE OF DAYS WHILE WEAKENING...AND

ISIS DEGENERATED TO A REMNANT LOW ON 17 SEPTEMBER. 



JAVIER FORMED AS A TROPICAL DEPRESSION ON 10 SEPTEMBER ABOUT 300 N

MI SOUTH OF THE GULF OF TEHUANTEPEC. THE DEPRESSION MOVED BETWEEN

THE WEST AND WEST-NORTHWEST AND BECAME TROPICAL STORM JAVIER ON THE

11TH. IT REACHED HURRICANE STATUS ON THE 12TH. THEREAFTER...JAVIER

TURNED TO THE NORTHWEST AND INTENSIFIED RAPIDLY...REACHING ITS PEAK

INTENSITY OF 130 KNOTS ON THE 14TH ABOUT 220 N MI SOUTH-SOUTHWEST

OF MANZANILLO. JAVIER TURNED TO THE NORTH-NORTHWEST AND NORTH

TOWARD BAJA CALIFORNIA BUT IT MOVED VERY SLOWLY OVER COOLER WATERS

AND WEAKENED.  BY THE TIME JAVIER REACHED THE WEST COAST OF BAJA

CALIFORNIA NEAR SAN IGNACIO ON 19 SEPTEMBER...THE CYCLONE HAD

WEAKENED TO A 25-KNOT TROPICAL DEPRESSION ACCOMPANIED BY A FEW

SQUALLS. JAVIER DISSIPATED LATER ON THAT DAY BUT ITS MID-LEVEL

MOISTURE SPREAD NORTHEASTWARD OVER NORTHERN MEXICO AND ARIZONA.       







SUMMARY TABLE - SEPTEMBER 2004



NAME             DATES            MAX WIND-KT          DEATHS

-------------------------------------------------------------------

H  HOWARD    30 AUG- 5 SEP          120                  0

H  ISIS           8-17 SEP           65                  0

H  JAVIER        11-19 SEP          130                  0

-------------------------------------------------------------------

NOTE: DATES ARE BASED ON UNIVERSAL COORDINATED TIME...UTC



FORECASTER PASCH/STEWART/AVILA/BEVEN



$$