000
AXPZ20 KNHC 280907
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC THU JAN 28 2010

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...ITCZ...

THE ITCZ AXIS WAS ANALYZED ALONG 03N77W TO 02.5N82.5W TO 05N104W 
TO 03N115W TO 04.5N131W TO 04N140W. ISOLATED MODERATE CONVECTION 
WAS OCCURRING WITHIN 60 NM S OF AXIS E OF 83W. ISOLATED TO 
SCATTERED MODERATE CONVECTION WAS OCCURRING WITHIN 150 NM N OF 
AXIS BETWEEN 92W AND 111W. ISOLATED MODERATE CONVECTION WAS 
OCCURRING WITHIN 30 NM OF AXIS BETWEEN 129W AND 132W. 

...DISCUSSION...

A HIGH AMPLITUDE UPPER LEVEL TROUGH EXTENDS FROM THE WRN U.S. 
S-SE ACROSS THE GULF OF CALIFORNIA...AND CONTINUING SW TO 
06N123W. MULTILAYERED MOISTURE CONTINUES TO SPREAD E AND NE 
ACROSS THE ERN SEMICIRCLE OF THE TROUGH OVER THE AREA N OF 24N 
ACROSS THE S HALF OF BAJA CALIFORNIA...THE NW QUARTER OF MEXICO 
AND INTO THE DESERT SW OF THE U.S. BROAD UPPER LEVEL RIDGES 
SANDWICH THIS UPPER TROUGH ON EITHER SIDE...BOTH TILTED INWARD 
TOWARDS THE TROUGH AXIS...AND AIDING IN ITS SLOWED E PROGRESSION 
ACROSS THE FORECAST AREA. 

ELSEWHERE AT THE SURFACE...A WEAK COLD FRONT EXTENDING FROM LOW 
PRESSURE OVER S ARIZONA S SW ACROSS CENTRAL BAJA CALIFORNIA TO 
24.5N116W. THE COLD FRONT WILL MOVE E OF THE AREA TODAY. HIGH 
PRESSURE 1020 MB CENTERED NEAR 35N125W IS PRODUCING NE TRADES OF 
20 TO 25 KT FROM 04N TO NEAR 18N W OF 120W. THE ASSOCIATED NE 
WIND SWELL GENERATED BY THESE TRADES WAS MIXING WITH SUBSIDING 
NW SWELLS THAT HAVE BEEN PROPAGATING SE ACROSS THE PACIFIC 
WATERS. THE REMAINING WATERS WELL OFFSHORE OF CENTRAL AMERICA 
WERE DOMINATED BY LIGHT TO MODERATE TRADES LESS THAN 20 KT...AND 
FADING NW SWELL. 

GAP WINDS...WINDS OF 20 TO 25 KT IN THE GULF OF TEHUANTEPEC ARE 
EXPECTED TO DIMINISH TO BELOW 20 KT TODAY. NE TO E TRADES OVER 
THE SW CARIBBEAN ARE FUNNELING THROUGH THE GULF OF PAPAGAYO AT 
20 TO 30 KT AND EXPANDING IN A NARROW W-SW PLUME TO 92W...AND 
ARE EXPECTED TO CONTINUE THROUGH FRI. NORTHERLY WINDS SURGING 
THROUGH THE GULF OF PANAMA AT 20 TO 25 KT AND EXPECTED TO 
DIMINISH TO 20 KT OR LESS FRI.

FOR ADDITIONAL INFORMATION PLEASE VISIT 
HTTP://WWW.HURRICANES.GOV/MARINE

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AL