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Active Tropical Systems Basin Outlooks Satellite
May 2007 Eastern Pacific Monthly Summary
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000
ABPZ30 KNHC 011448
TWSEP 
MONTHLY TROPICAL WEATHER SUMMARY
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
800 AM PST FRI JUN 1 2007
 
FOR THE EASTERN NORTH PACIFIC...EAST OF 140 DEGREES WEST LONGITUDE..

TROPICAL CYCLONE ACTIVITY DURING MAY WAS ABOVE AVERAGE AS TWO
TROPICAL STORMS FORMED...ALVIN AND BARBARA. ONLY TWICE BEFORE HAVE
TWO TROPICAL STORMS DEVELOPED IN MAY...1984 AND 1956...SINCE
OFFICIAL RECORDS BEGAN IN 1949. THE LONG-TERM MEAN INDICATES THAT A
NAMED STORM TYPICALLY FORMS ABOUT EVERY OTHER MAY. HOWEVER....THIS
IS THE EIGHTH CONSECUTIVE MAY THAT A TROPICAL CYCLONE HAS DEVELOPED
IN THE EAST PACIFIC BASIN.

ALVIN GENERATED FROM A TROPICAL WAVE THAT ENTERED THE EAST PACIFIC
BASIN ON 18 MAY.  THE WAVE MOVED WESTWARD DURING THE NEXT SEVERAL
DAYS WITHOUT MUCH DEVELOPMENT.  ON 24 MAY...A BROAD AREA OF LOW
PRESSURE DEVELOPED ALONG THE WAVE ABOUT 550 MILES SOUTH-SOUTHWEST
OF MANZANILLO MEXICO.  THE SYSTEM ACQUIRED ENOUGH ORGANIZATION TO
BE CLASSIFIED AS A TROPICAL DEPRESSION ON 27 MAY...WHILE CENTERED
ABOUT 625 MILES SOUTHWEST OF MANZANILLO.  THE DEPRESSION BECAME A
MINIMAL TROPICAL STORM ON 29 MAY AND MOVED SLOWLY WESTWARD DURING
ITS ENTIRE EXISTENCE.  ALVIN DID NOT INTENSIFY FURTHER AND WEAKENED
TO A TROPICAL DEPRESSION ON 30 MAY.  IT DEGENERATED INTO A REMNANT
LOW ON 31 MAY ABOUT 800 MILES SOUTH-SOUTHWEST OF THE SOUTHERN TIP
OF THE BAJA PENINSULA.

BARBARA ORIGINATED FROM A SLOW-MOVING TROPICAL WAVE THAT MOVED OFF
THE COAST OF CENTRAL AMERICA ON 24 MAY.  THE WAVE PRODUCED
DISORGANIZED SHOWERS AND THUNDERSTORMS DURING THE NEXT COUPLE OF
DAYS.  ON 28 MAY...A SMALL AREA OF LOW PRESSURE FORMED A COUPLE
HUNDRED MILES SOUTHWEST OF THE GULF OF TEHUANTEPEC AS THE WAVE
INTERACTED WITH THE ITCZ.  THUNDERSTORM ACTIVITY BECAME BETTER
ORGANIZED NEAR THE LOW AND A TROPICAL DEPRESSION DEVELOPED ON 29
MAY ABOUT 125 MILES SOUTHWEST OF PUERTO ANGEL MEXICO.  THE
DEPRESSION MOVED SLOWLY SOUTHEASTWARD AND BECAME A TROPICAL STORM
THE NEXT DAY.  AT THE END OF THE MONTH BARBARA WAS LOCATED ABOUT 
200 MILES SOUTH-SOUTHEAST OF PUERTO ANGEL MEXICO. 

SUMMARY TABLE

NAME             DATES         MAX WIND (KT)     DEATHS
-------------------------------------------------------
TS ALVIN        27-31 MAY          35                0
TS BARBARA      29 MAY-            40                0
        
-------------------------------------------------------         

NOTE...DATES BASED ON COORDINATED UNIVERSAL TIME (UTC)

$$

FORECASTER BROWN/AVILA