000
AXPZ20 KNHC 240349
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SAT MAR 24 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 0345 UTC.

...ITCZ...
ITCZ ALONG 5N77W  8N83W  4N97W  9N116W  3N140W.  SCATTERED 
MODERATE ISOLATED STRONG WITHIN 90 NM OF AXIS W OF 111W. 

...DISCUSSION...
UPPER LEVELS...
UPPER LEVEL CYCLONIC VORTEX AT 32N110W HAS TROUGH EXTENDING SW 
TO 21N126W THEN W TO 21N140W.  VERY DRY AIR MASS DUE TO STRONG 
SUBSIDENCE ALOFT WITHIN 90 NM EITHER SIDE OF TROUGH AXIS.  
ELSEWHERE N OF 20N MODERATE SUBSIDING AIR MAINTAINS AREA WITH NO 
VERTICAL CLOUD DEVELOPMENT...ONLY LARGE REGION OF BROKEN TO 
OVERCAST LOW LEVEL STRATIFIED CLOUDS.

S OF 20N ANTICYCLONIC FLOW ALLOWS PLENTY OF MOISTURE ALOFT INTO 
E PAC UNDER SMALL 95 KT JET CORE AT 18N110W.  UPPER LEVEL 
DIFFLUENT FLOW NEAR 12N113W ENHANCING CONVECTION ALREADY 
ASSOCIATED WITH WEAK SURFACE TROUGH IN THAT LOCATION.  

CONVERGING UPPER WIND BETWEEN RIDGE AND DOWNSTREAM UPPER LEVEL 
TROUGH PRODUCING MODERATE SUBSIDENCE E OF 102W DRYING OUT 
REMAINDER E PAC EXCEPT MINOR CONVECTION ALONG ITCZ FROM 85W-95W.

AT THE SFC...
BROAD 1027 MB HIGH PRES CENTER AT 32N138W HAS RIDGE EXTEND SE TO 
17N114W.  WEAK TROUGH IN SE PERIPHERY OF RIDGE HAS MINOR 
DIMINISHING CONVECTION AS AIR MASS ALOFT DRIES OUT.  BRISK 
TRADES DIMINISH IN COVERAGE BUT REMAIN 20-25 FROM 5N TO 20N W OF 
120W.  

GAP WINDS...
SMALL SECTION OF N WINDS 20 TO 30 KT IN GULF OF TEHUANTEPEC AND 
SIMILAR NE WINDS OVER GULF OF PAPAGAYO SHOULD REMAIN WITH LITTLE 
CHANGE AS HEALTHY ATLC RIDGE REMAINS IN PLACE.  

$$
WALLY BARNES