000
AXPZ20 KNHC 060349
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC WED MAR 6 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 
0300 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH EXTENDS FROM 08N78W TO 07N85W TO 03N91W TO 
04N100W...THEN ITCZ TO 06N124W TO 02N140W. SCATTERED MODERATE 
CONVECTION WITHIN 90 NM N OF AXIS BETWEEN 95W AND 103W.

...DISCUSSION...
THE SUBTROPICAL RIDGE EXTENDS FROM 31N118W TO 1021 MB HIGH PRES 
CENTERED NEAR 28N123W TO 27N143W TO 1025 MB HIGH PRES CENTERED 
NEAR 32N151W. SOUTHERN PORTION OF A COLD FRONT REACHING THE COAST
OF NORTHERN CALIFORNIA AND SOUTHERN OREGON EXTENDS FROM 36N126W 
TO 28N133W TO 26N140W...CLIPPING THE NW PART OF THE DISCUSSION 
AREA. ASCAT SCATTEROMETER PASS AT 1900 UTC AND WINDSAT PASS AT 
1635 UTC BOTH SHOWED GENTLE TO MODERATE WINDS ASSOCIATED WITH 
THE FRONTAL BOUNDARY.

EXPECT HIGH PRES ASSOCIATED WITH SUBTROPICAL RIDGE TO BECOME 
FIRMLY ENTRENCHED NEAR 35N140W WED THEN GRADUALLY SHIFT E TO NEAR
35N132W THROUGH SAT...ACTING TO STEER STORM SYSTEMS INTO BRITISH 
COLUMBIA AND AWAY FROM THE DEEP TROPICS.

STORM FORCE WINDS A FEW DAYS AGO IN GULF OF TEHUANTEPEC HAVE 
PRODUCED A LARGE AREA OF NE SWELL SPREADING DOWNWIND FROM ITS 
SOURCE REGION...NOW EXTENDING S OF 13N BETWEEN 96W AND 120W. 
EXPECT A SHORT-LIVED GALE WIND EVENT TO COMMENCE IN THE GULF OF 
TEHUANTEPEC AROUND 12Z WED...AND CONTINUE THROUGH 12Z-15Z THU. 
THIS WILL GENERATE A NEW SET OF WIND WAVES THAT WILL SPREAD SW 
AS NE SWELL THROUGH FRI MORNING. WINDS WILL BE 20 KT OR LESS BY 
LATE THU. EXPECT NE WINDS IN GULF OF PAPAGAYO TO PULSE AT AROUND 
20 KT THROUGH EARLY THU...WITH SEAS 6-8 FT FROM 08N TO 11N W OF 
90W...THEN INCREASE AGAIN TO 20-25 KT BY THU AFTERNOON. NW SWELL 
ASSOCIATED WITH FRONT BRUSHING PAST NW PORTION OF AREA WILL 
SPREAD SE OVER NW HALF OF FORECAST AREA THROUGH WED AFTERNOON... 
THEN DIMINISH THU.

$$
MUNDELL