000
AXPZ20 KNHC 262124
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC SAT APR 26 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 ALONG 04N77W 07N88W 05N110W 01N127W 04N140W. SCATTERED 
MODERATE TO STRONG WITHIN 120-180 NM OF AXIS W OF 131W. 
SCATTERED MODERATE ISOLATED STRONG WITHIN 120 NM N OF THE AXIS 
BETWEEN 120W AND 125W. WIDELY SCATTERED MODERATE FROM 3N TO 12N 
BETWEEN 84W AND 96W. 

...DISCUSSION...
W OF 100W...
MID TO UPPER TROPOSPHERIC RIDGE AXIS STRETCHES NORTHWARD FROM A 
HIGH SITUATED NEAR 16N129W THROUGH 32N127W. 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 126W. 
ELSEWHERE E...TROUGH EXTENDS SOUTH-SOUTHWEST FROM THE SW 
U.S....OVER CENTRAL BAJA CALIFORNIA...THEN TO 20N122W. 
SUBSIDENCE/DRY CONDITIONS ASSOCIATED WITH THE AFOREMENTIONED 
TROUGH DOMINATE THE AREA N OF 20N BETWEEN 110W AND 126W. ANOTHER 
MERIDIONAL ORIENTED JET FINGER IS GENERATING A REGION OF MID AND 
UPPER CLOUDS OVER CENTRAL MX AND ADJACENT WATERS S OF 20N E OF 
116W...THEN CONTINUING E OVER NRN MEXICO. S OF 5N...UPPER 
DIFFLUENCE IS AIDING THE PRODUCTION OF STRONG CONVECTIVE 
ACTIVITY ALONG THE ITCZ W OF 129W. 

E OF 100W...
AN UPPER RIDGE EXTENDS FROM NRN COLOMBIA WESTWARD THROUGH 
NICARAGUA TO 13N110W....WITH CONTINUED PARCHED CONDITIONS OVER 
CENTRAL AMERICA. SHOWERS AND THUNDERSTORMS ARE MOVING OVER THE 
COAST OF GUATEMALA ORIGINATING OVER COASTAL WATERS E TO 94W.

AT THE SURFACE...1026 MB HIGH PRES N OF THE AREA NEAR 35N129W 
WITH PERSISTENT RIDGE EXTENDS SE FROM THE HIGH PRESSURE CELL 
CENTER TO 15N105W.

GAP WINDS...
GLOBAL MODELS AGREE WITH DELAYING ONSET OF TEHUANTEPEC EVENT 
UNTIL EARLY TUE...AND NOW INDICATING NEAR GALE FORCE BY TUE AFTN.

$$
ROBERTS