000
AXPZ20 KNHC 272158
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC THU NOV 27 2008

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN
FROM THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

...ITCZ...
ITCZ AXIS IS CENTERED ALONG 08N78W TO 05N100W TO 06N120W TO 
08N130W TO 06N140W.  SCATTERED MODERATE CONVECTION WITHIN 90 NM 
OF AXIS E OF 86W.  SCATTERED MODERATE WITHIN 180 NM N OF AXIS W 
OF 126W.

...DISCUSSION...
DEEP LAYER LOW PRES TROUGH EXTENDS FROM SW CONUS TO 25N140W 
BRINGS VERY DRY AIR MASS W OF TROUGH AXIS TO E PAC.  WEAK 80 KT 
DOWNSTREAM JET CORE PARALLELS TROUGH AXIS ADVECTING LARGE 
AMOUNTS OF TROPICAL MOISTURE ACROSS E PAC INTO SRN BAJA 
CALIFORNIA AND NW MEXICO.  MID-UPPER LEVEL ANTICYCLONE CENTERED 
OVER COLOMBIA HAS RIDGE EXTEND W TO 10N113W MAINTAINING VERY DRY 
AIR MASS UNDER ITS UMBRELLA.  ONLY MINOR MOISTURE SNEAKS ALONG 
ITCZ E OF 86W.  

AT THE SURFACE...
PRES GRADIENT BETWEEN 1027 MB HIGH CENTER AT 28N147W AND WEAK 
TROUGH ALONG GULF OF CALIFORNIA TIGHTENS AS HIGH PRES DRIFTS E.  
N WINDS ALONG BOTH COASTS OF BAJA CALIFORNIA BECOMING STRONG 
WITHIN NEXT 48 HRS.  LARGE LONG PERIOD NW SWELLS SPREADING S 
THROUGH BASIN REACH EQUATOR AND W OF 119W. 

NE TRADE WINDS FROM 10-20N W OF 126W INCREASE AND LAST THROUGH 
FORECAST PERIOD.  

GAP WINDS...
STRONG N WIND CONTINUE FUNNELING THROUGH ISTHMUS OF TEHUANTEPEC 
...BUT SUBSIDE QUICKLY WITHIN NEXT 18 HRS AS HIGH PRES OVER GULF 
OF MEXICO MOVES E AND REVERSES FLOW.  SIMILAR NE WINDS OCCURRING 
OVER GULF OF PAPAGAYO EXPECTED TO DIMINISH AS FLOW OVER NWRN 
CARIBBEAN VEER SE WITH ATLC RIDGE MOVING E.

$$
WALLY BARNES