000
AXPZ20 KNHC 090230
TWDEP 

TROPICAL WEATHER DISCUSSION                  
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
0405 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0230 UTC. 

...SPECIAL FEATURES...
       
GULF OF TEHUANTEPEC STORM WARNING

HIGH PRESSURE OF 1021 MB OVER EASTERN MEXICO IS HELPING PRODUCE 
A PRESSURE GRADIENT TO SUPPORT STRONG GALE FORCE WINDS OVER THE 
GULF OF TEHUANTEPEC. WINDS ARE EXPECTED TO FURTHER INCREASE TO 
STORM FORCE DURING THE OVERNIGHT HOURS WITH THE ADDED COMPONENT 
OF NOCTURNAL DRAINAGE FLOW. THE GAP WIND EVENT WILL THEN SLOWLY 
START TO WIND DOWN THROUGH FRIDAY...WITH THE STORM FORCE WINDS 
EXPECTED TO DIMINISH TO STRONG GALE FORCE WED AFTERNOON...THEN 
BELOW GALE FORCE THU AFTERNOON. WINDS AND SEAS WILL FINALLY 
DECREASE BELOW ADVISORY CRITERIA FRIDAY AFTERNOON.

GULF OF PAPAGAYO GALE WARNING

THE COLD FRONT RESPONSIBLE FOR THE STORM EVENT OVER THE GULF OF 
TEHUANTEPEC WILL CONTINUE TO SHIFT EASTWARD AND HELP FOR A RARE 
GALE FORCE GAP WIND EVENT OVER THE GULF OF PAPAGAYO. WINDS WILL 
INCREASE TO 25 KT BY WED MORNING. WINDS WILL THEN FURTHER 
INCREASE TO NEAR GALE FORCE LATE WED NIGHT...THEN BRIEFLY REACH 
GALE FORCE EARLY THU MORNING BEFORE DIMINISHING BELOW GALE FORCE 
THU AFTERNOON.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
 
THE MONSOON TROUGH EXTENDS FROM 08N82W TO 06N93W WHERE LOW LEVEL 
WINDS SUGGEST A TRANSITION TO ITCZ WHICH EXTENDS TO 08N113W TO 
05N132W TO BEYOND 05N140W. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION WAS NOTED WITHIN 120 NM S OF TROUGH BETWEEN 84W AND 
87W. SCATTERED MODERATE ISOLATED STRONG CONVECTION WAS 
NOTED WITHIN 90 NM OF ITCZ W OF 135W.

...DISCUSSION...                                                

DISSIPATING SURFACE HIGH PRESSURE OF 1022 MB IS CENTERED N OF 
THE AREA NEAR 37N128W EXTENDS A RIDGE SE TO NEAR 20N111W. LOW 
PRESSURE OF 1010 MB IS CENTERED JUST W OF THE AREA NEAR 29N142W 
WITH ASSOCIATED COLD FRONT JUST W OF THE AREA. THE PRESSURE 
GRADIENT OVER THE FORECAST AREA IS MAINTAINING MODERATE TO FRESH 
TRADEWINDS S OF 20N AND W OF 120W. LINGERING SEAS TO 9 FT ARE 
FOUND OVER FORECAST WATERS W OF LINE 14N134W TO 10N115W TO 
03.4S98W. THIS SWELL WILL SLOWLY SUBSIDE OVER THE NEXT COUPLE OF 
DAYS. AHEAD OF THE COLD FRONT MENTIONED ABOVE...FRESH TO STRONG 
SOUTHERLY WINDS ARE OVER THE FAR NW PART OF THE FORECAST AREA W 
OF LINE 30N138W TO 25N140W WITH COMBINED SEAS TO 8 FT IN NW 
SWELL. THE COLD FRONT WILL MOVE INTO THE FORECAST AREA OVERNIGHT 
WITH FRESH TO STRONG WINDS CONTINUING E OF THE FRONT THROUGH WED 
AFTERNOON BEFORE DIMINISHING BELOW 25 KT. THE ASSOCIATED SWELL 
WILL MOVE FURTHER INTO THE NW WATERS WHILE SUBSIDING. BY THU 
MORNING...COMBINED SEAS ASSOCIATED WITH THIS SWELL WILL SUBSIDE 
BELOW 8 FT. 

$$ 
AL