000
AXPZ20 KNHC 270322
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SUN APR 27 2008

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

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0300 UTC.

...ITCZ...
ITCZ AXIS ALONG 03N77W 02N80W 07N103W 02N133W 03N140W. SCATTERED 
MODERATE FROM 05N TO 07N BETWEEN 87W AND 89W. WIDELY SCATTERED 
MODERATE FROM 04N TO 06N BETWEEN 120W AND 135W. SCATTERED 
MODERATE FROM 03N TO 07N W OF 137W.

...DISCUSSION...
W OF 100W...
MID TO UPPER TROPOSPHERIC RIDGE AXIS STRETCHES NORTHWARD FROM A 
HIGH SITUATED NEAR 17N131W THROUGH 32N126W. DIFFLUENT SOUTHERLY 
FLOW OVER THE WESTERN HALF OF THE RIDGE AXIS COMBINING WITH 
SUBTROPICAL JET FINGER ENTERING THE EXTREME NW CORNER OF THE 
AREA IS SUPPORTING A BROAD AREA OF MOISTURE N OF 14N W OF 123W. 
ELSEWHERE E...TROUGH EXTENDS SOUTH-SOUTHWEST FROM THE SW 
U.S....OVER CENTRAL BAJA CALIFORNIA...THEN TO 19N125W. 
SUBSIDENCE/DRY CONDITIONS ASSOCIATED WITH THE AFOREMENTIONED 
TROUGH DOMINATE THE AREA N OF 18N E OF 123W. ANOTHER MERIDIONAL 
ORIENTED JET FINGER...DOWNSTREAM OF THE TROUGH AXIS...IS 
PRODUCING A AREA OF MID AND UPPER CLOUDS OVER CENTRAL MX AND 
ADJACENT WATERS S OF 20N E OF 120W...THEN CONTINUING E OVER NRN 
MEXICO. S OF 5N...UPPER DIFFLUENCE IS AIDING THE PRODUCTION OF 
STRONG CONVECTIVE ACTIVITY ALONG THE ITCZ W OF 130W. 

E OF 100W...
A GRADUALLY WEAKENING UPPER RIDGE EXTENDS FROM NRN 
COLOMBIA...OVER COSTA RICA TO 14N110W. WITH THE RECENT WEAKENING 
TREND...MID TO UPPER MOISTURE IS BEGINNING TO SPILL OVER THE 
AXIS AND SPREAD OVER HONDURAS/GUATEMALA.  

AT THE SURFACE...1026 MB HIGH PRES N OF THE AREA NEAR 35N130W 
WITH PERSISTENT RIDGE EXTENDING SE FROM THE HIGH PRESSURE CELL 
CENTER TO 20N110W.

GAP WINDS...
LARGE SCALE MODELS STILL SHOW ONSET OF SHORT-LIVED NEAR GALE 
TEHUANTEPEC EVENT EARLY TUE...AND ENDING BY WED AFTN.

$$
ROBERTS