000
AXPZ20 KNHC 280318
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC WED MAR 28 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 
0245 UTC.

...ITCZ...
ITCZ AXIS ALONG 6N77W  7N86W 5N98W  6N110W  4N126W  5N140W.  
SCATTERED MODERATE WITHIN 120 NM OF AXIS FROM 110W TO 132W.  
SCATTERED ISOLATED STRONG WITHIN 90 NM OF AXIS E OF 91W.

...DISCUSSION...
MID/UPPER LEVEL LONGWAVE TROUGH ENERGIZED BY POWERFUL SHORTWAVE 
NEAR 34N114W AS 130 KT JET CORE ROUNDS SHORTWAVE TROUGH BASE.  
VERY DRY AIR MASS WITHIN 300 NM NW OF LONGWAVE TROUGH AXIS FROM 
30N116W TO 19N113W TO 14N137W.  WEAK SUBTROPICAL JET STREAM 
ADVECTING PLENTY OF TROPICAL MOISTURE FROM ITCZ DEBRIS UNTO SRN 
AND CENTRAL MEXICO AND INTO SRN GULF OF MEXICO.  

BROAD FLATTENED RIDGE MAINTAINS ANTICYCLONIC FLOW OVER REMAINDER 
E PAC UPSTREAM OF TROUGH AND EXTENDS DRY AREA TO 140W S OF 25N. 
WEAK ANTICYCLONE CENTERED AT 10N81W ALSO KEEPS DRY AREA N OF 7N
E OF 102W AS ATLC RIDGE ERODES AND RETREATS EASTWARD.  

AT THE SFC...VERY HEALTHY HIGH PRES 1037 MB WELL N OF AREA 
CONTROLS WIND PATTERN WITH VERY STRONG TRADES W OF 120W N OF 
ITCZ.  HIGH PRES FORECAST TO SHIFT E AND WEAKEN OVER NEXT COUPLE 
OF DAYS AS NW WINDS DAM AGAINST COAST AND GULF OF CALIFORNIA 
THROUGH FORECAST PERIOD.

$$
WALLY BARNES