000
AXPZ20 KNHC 170241
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SUN MAR 17 2013

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 
0315 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

MONSOON TROUGH AXIS FROM 09N84W TO 03N90W THEN ITCZ AXIS TO 
01N99W TO 03N117W TO 02N140W.  NO SIGNIFICANT CONVECTION..

...DISCUSSION...
PREVIOUS UPPER LEVEL CYCLONE OVER CENTRAL MEXICO HAS OPEND UP
AS SHARP DEEP TROUGH DIGGING SW TO 00N116W.  VIGOROUS SHORT WAVE
TROUGH WITH JET CORE 60 KT BRINGS ABUNDANT TROPICAL MOISTURE
INTO WESTERN HALF OF GULF OF MEXICO JUST AHEAD OF SURFACE LOW 
PRES 1001 MB OVER OKLAHOMA AND DRY LINE ACROSS CENTRAL TEXAS.
E PAC REMAINS TAME OVERALL AS RIDGE ALOFT MAINTAINS DRY AND 
STABLE CONDITIONS W OF 110W.  BROAD MID TO UPPER LEVEL RIDGE 
OVER GUYANA EXTENDS AS FAR W AS 90W IN E PAC EXTENDING KIND 
CONDITIONS OVER BASIN.  

GULF OF TEHUANTEPEC...WINDS HAVE DIMINISHED BELOW GALE FORCE.
WEAK PRES GRADIENT ALLOWS WIND TO FURTHER DIMINISH THROUGH
TONIGHT AND SUN.  LOOKING AHEAD...NO SIGNIFICANT WIND PULSES 
EXPECTED IN GULF OF TEHUANTEPEC THROUGH MON.

GULF OF PAPAGAYO...STRONG WINDS HAVE DIMINISHED EARLIER TONIGHT 
AS ATLC HIGH PRES CAUSING TIGHT GRADIENT OVER CARIBBEAN MOVES E
AND RELAXES PRES GRADIENT EFFECTIVELY SHUTTING OFF SOURCE OF 
GAP WINDS.

COMBINED ABOVE-MENTIONED WIND PULSES THROUGH GULFS OF PAPAGAYO
AND TEHUANTEPEC OVER PAST DAYS HAVE RESULTED IN LARGE AREA OF
NE-E SWELL S OF 12N AS FAR W AS 120W.

HIGH PRES CENTER 1028 MB AT 36N132W MAINTAINS FRESH TO STRONG 
NORTHERLY WINDS OFF SOUTHERN CALIFORNIA WITH 8-9 FT N SWELL 
ENCROACHING INTO BASIN AS FAR S AS 28N TONIGHT THROUGH MON 
BETWEEN 120W AND 125W.

$$
WALLY BARNES