000
AXPZ20 KNHC 011600
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC FRI JUN 01 2012

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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...MONSOON 
TROUGH EXTENDS FROM 09N84W TO 11N95W TO 08N115W THEN ITCZ TO 
05N122W TO BEYOND 04N149W.  SCATTERED STRONG CONVECTION WITHIN 
180 NM S OF AXIS FROM 111W TO 118W. ISOLATED MODERATE CONVECTION 
S OF AXIS TO 03N E OF 96W.

...DISCUSSION...
SHARP MID/UPPER TROUGH STRETCHES FROM BAY OF CAMPECHE SW ACROSS 
S MEXICO TO CYCLONE AT 13N100W THEN CONTINUE TO 00N111W.  BROAD 
WELL ANCHORED ANTICYCLONIC DOME CENTERED AT 14N118W MAINTAINS 
VERY DRY AIR MASS THROUGHOUT MOST OF BASIN EXCEPT ALONG 
ITCZ/MONSOON TROUGH AND MINOR MOISTURE PLUME RIDING WEAK 
SUBTROPICAL JETSTREAM N OF 15N W OF 133W.  

RIDGE BLOCKS HEALTHY UPPER LEVEL TROUGH NW OF BASIN FROM DIGGING 
INTO E PAC...BUT TROUGH SWEEPS N OF BASIN FLATTENING RIDGE CREST 
...RESULTING IN ZONAL UPPER LEVEL WINDS N OF 20N.  LACK OF ANY 
SIGNIFICANT MOISTURE AND ZONAL WINDS MODERATES WEATHER FEATURES 
ELSEWHERE FROM ITCZ/MONSOON TROUGH.

AT THE SURFACE...WEAKENING HIGH PRES CENTER 1025 MB AT 31N142W 
HAS RIDGE EXTEND SE TO 15N115W.  THIS MAINTAINS A MODERATE NE 
BREEZE OVER TRADEWIND BELT BUT STRONGER NW TO N WINDS ALONG 
CALIFORNIA COASTAL SECTIONS AS RIDGE DRIFTS E AND PRES GRADIENT 
TIGHTENS.  ASSOCIATED 8-9 FT SEAS SEEP S OF 30N E OF 130W.  

PREVIOUS LOW PRES EMBEDDED IN MONSOON TROUGH NEAR 117W CAN NO 
LONGER BE IDENTIFIED AND HAS BEEN DROPPED FROM ANALYSIS CHART. 

CROSS EQUATORIAL LONG-PERIOD MODERATE SWELL ALONG SOUTHERN 
BOUNDARY SPREADS S OF 20N BY LATE FRI.  SIGNIFICANT WAVE HEIGHTS 
REACH 8-9 FT.

$$
WALLY BARNES