000
AXPZ20 KNHC 031522
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU MAY 3 2007

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 
1445 UTC.

...ITCZ...
AXIS ALONG 7N77W  9N87W  5N100W  8N115W  4N140W.  SCATTERED 
MODERATE ISOLATED STRONG WITHIN 90 NM OF AXIS E OF 110W.  
SCATTERED MODERATE TO STRONG WITHIN 120 NM OF AXIS W OF 113W.  

...DISCUSSION...
LONGWAVE UPPER LEVEL TROUGH ENTERED E PAC FROM 32N125W TO 19N140W
WITH VERY DRY AIR MASS ALOFT NW OF AXIS.  UPPER LEVEL 
ANTICYCLONIC CIRCULATION AT 9N108W AHAS RIDGE COVER E PAC 
ELSEWHERE E OF 90W.  PLENTY OF MOISTURE ADVECTED BY VERY WEAK 70 
KT JET W OF ANTICYCLONE JUST ENTERING SRN TIP OF BAJA CALIFORNIA 
NOW.  

WEAK UPPER LEVEL TROUGH OVER E CONUS DIGS S INTO EXTREME ERN E 
PAC E OF 90W CAUSING SOME UPPER LEVEL DIFFLUENCE AND ENHANCING 
CONVECTION ALONG ITCZ E OF 95W.

AT THE SURFACE...
HIGH PRES CENTER 1030 MB AT 32N146W HAS RIDGE EXTEND TO 13N105W
WITH STRONG NE TRADES W OF 125W.  LARGE SWELL TRAIN FROM LOW 
PRES WELL N OF AREA STILL ENCROACHES INTO E PAC N OF TRADE 
REGION.  TRADE COVERAGE AND STRENGTH DIMINISHES AS HIGH PRES 
DRIFTS E.  

AREA OF STRONG NW WIND ALONG BAJA CALIFORNIA COAST BRINGS IN 
SWELLS S TO 23N.  OTHER CROSS EQUATORIAL SWELL TRAIN INVADE E 
PAC S OF 5N BUT ABATE WITHIN 48 HRS.   

$$
WALLY BARNES