000
AXPZ20 KNHC 092105
TWDEP 

TROPICAL WEATHER DISCUSSION                  
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
1605 UTC WED APR 09 2014

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS 
BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC. 

...SPECIAL FEATURES...
       
GULF OF TEHUANTEPEC GALE WARNING

STRONG HIGH PRESSURE THAT WAS CENTERED OVER EASTERN MEXICO HAS 
SHIFTED INTO THE NW GULF OF MEXICO. THIS HAS LOOSENED THE 
PRESSURE GRADIENT FOR WINDS FUNNELING INTO THE GULF OF 
TEHUANTEPEC. AS A RESULT...WINDS HAVE DIMINISHED BELOW STORM 
FORCE TO STRONG GALE FORCE OVER THE GULF OF TEHUNATEPEC. WINDS 
WILL CONTINUE TO SLOWLY DIMINISH OVER THE NEXT COUPLE OF 
DAYS...TO BELOW GALE FORCE BY THU AFTERNOON...AND TO 20 KT OR 
LESS BY FRI AFTERNOON. SEAS ASSOCIATED WITH THIS GAP WIND EVENT 
HAVE PEAKED NEAR 23 FT THIS MORNING...AND ARE SLOWLY SUBSIDING 
WITH SEAS PEAKING NEAR 20 FT THIS AFTERNOON. THE SWELL WILL 
CONTINUE TO SPREAD S AND W OVER THE NEXT COUPLE OF DAYS WITH 
SEAS GREATER THAN 8 FT REACHING AS FAR W AS 115W BY FRI 
AFTERNOON.

GULF OF PAPAGAYO GALE WARNING

THE COLD FRONT RESPONSIBLE FOR THE STORM EVENT OVER THE GULF OF 
TEHUANTEPEC WILL HELP FOR A RARE GALE FORCE GAP WIND EVENT OVER 
THE GULF OF PAPAGAYO. WINDS OVER THE GULF OF PAPAGAYO AND 
FONSECA HAVE INCREASED TO 25 KT. WINDS OVER THE GULF OF PAPAGAYO 
WILL FURTHER INCREASE TO NEAR GALE FORCE TONIGHT...THEN REACH 
GALE FORCE LATE TONIGHT WITH THE ADDED COMPONENT OF NOCTURNAL 
DRAINAGE FLOW. WINDS WILL DIMINISH BELOW GALE FORCE THU 
AFTERNOON.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
 
THE MONSOON TROUGH EXTENDS FROM 08N82W TO 05N91W WHERE LOW LEVEL 
WINDS SUGGEST A TRANSITION TO ITCZ WHICH EXTENDS TO 04N122W TO 
03N140W. SCATTERED MODERATE TO STRONG CONVECTION WAS NOTED 
WITHIN 150 NM S OF TROUGH BETWEEN 84W AND 88W. SCATTERED 
MODERATE CONVECTION WAS NOTED WITHIN 60 NM OF ITCZ BETWEEN 122W 
AND 128W. 

...DISCUSSION...                                                

DISSIPATING SURFACE HIGH PRESSURE OF 1021 MB IS CENTERED N OF 
THE AREA NEAR 34N127W EXTENDS A RIDGE SE TO NEAR 25N118W. LOW 
PRESSURE OF 1008 MB IS CENTERED JUST W OF THE AREA NEAR 29N141W 
WITH ASSOCIATED COLD FRONT EXTENDING OVER THE FORECAST WATERS 
FROM 30N136W TO 22N140W. THE PRESSURE GRADIENT OVER THE FORECAST 
AREA IS MAINTAINING MODERATE TO FRESH TRADEWINDS S OF 20N AND W 
OF 120W. LINGERING SEAS TO 8 FT ARE FOUND FROM 06N TO 11N W OF 
132W. THIS AREA OF SEAS WILL DIMINISH BELOW 8 FT BY THU 
AFTERNOON. ANOTHER AREA OF SEAS TO 9 FT ARE FOUND S OF 00N 
BETWEEN 105W AND 112W. THIS AREA OF SWELLS WILL MIX WITH NE 
SWELLS GENERATED FROM THE GULF OF TEHUANTEPEC GALE FORCE WIND 
EVENT FRI. FRESH TO STRONG WINDS ARE FOUND N OF 27N AHEAD OF THE 
COLD FRONT TO 134W. THE COLD FRONT WILL SLOWLY SHIFT EASTWARD TO 
EXTEND FROM FROM 30N132W TO 21N140W BY THU AFTERNOON WITH 
ASSOCIATED WINDS DIMINISHING BELOW 25 KT AND SEAS SUBSIDING 
BELOW 8 FT. 

$$ 
AL