000
AXPZ20 KNHC 272119
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC TUE MAR 27 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2045 UTC.

...ITCZ...
ITCZ AXIS ALONG 5N77W  6N90W 7N110W  4N129W  5N140W.  SCATTERED 
MODERATE WITHIN 120 NM OF AXIS FROM 104W TO 133W.  SCATTERED 
ISOLATED STRONG WITHIN 90 NM OF AXIS E OF 95W.

...DISCUSSION...
MID/UPPER LEVEL LONGWAVE TROUGH ENERGIZED BY POWERFUL SHORTWAVE 
NEAR 34N115W AS 125 KT JET CORE ROUNDS SHORTWAVE TROUGH BASE.  
VERY DRY AIR MASS WITHIN 300 NM NW OF LONGWAVE TROUGH AXIS FROM 
30N115W TO 18N115W TO 10N137W.  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 8N84W 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.
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. ALL GAP WINDS HAVE SUBSIDED BELOW 20 KT.

$$
WALLY BARNES