000
AXPZ20 KNHC 252203
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC FRI APR 25 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 
2115 UTC.

...ITCZ...
ITCZ AXIS ALONG 05N77W 03N83W 06N97W 05N104W 06N113W 05N117W 
05N123W 03N140W. SCATTERED MODERATE CONVECTION WITHIN 130 NM N 
OF AXIS BETWEEN 99W AND 101W. SCATTERED MODERATE/ISOLATED STRONG 
FROM 07N TO 09N BETWEEN 106W AND 116W AND WITHIN 100 NM N OF 
AXIS BETWEEN 124W AND 128W. SCATTERED MODERATE WITHIN 60 NM OF 
AXIS BETWEEN 129W AND 133W.

...DISCUSSION...
MID TO UPPER TROPOSPHERIC RIDGE CONTINUES TO BUILD/AMPLIFY OVER 
THE WESTERN PORTION OF THE DISCUSSION AREA IN RESPONSE TO WARM 
AIR ADVECTION ASSOCIATED WITH A STRONG BAROCLINIC SYSTEM LOCATED 
OVER THE CENTRAL NORTH PACIFIC. THE RIDGE AXIS EXTENDS NORTHWARD 
ALONG 130W FROM AN ANTICYCLONE ANCHORED NEAR 18N131W. 
MULTI-LAYERED CLOUDS AND MOISTURE SPREAD E...N OF 10N W OF 
123W...AND ARE ASSOCIATED WITH A SUBTROPICAL JET FINGER ENTERING 
THE NW PORTION OF THE AREA.  THE MOISTURE PLUME CONTINUES 
FURTHER E ALONG WITH THE JET...BUT TO A LESSER DEGREE...OVER THE 
SOUTHERN TIP OF BAJA CALIFORNIA AND INTO MX. MODERATE TO STRONG 
SUBSIDENCE WITHIN A BROAD AREA OF TROUGHING DOMINATES THE 
NORTHERN AREA...N OF 22N. ELSEWHERE...AN UPPER LEVEL RIDGE 
EXTENDS FROM CENTRAL AMERICA TO 8N118W. DRIER CONDITIONS ARE 
NOTED N OF THE RIDGE AXIS WITH ABUNDANT TROPICAL MOISTURE S OF 
THE RIDGE AXIS. 

AT THE SURFACE...A 1030 MB HIGH PRES N OF THE AREA NEAR 34N127W 
WITH ASSOCIATED RIDGE STRETCHING SE FROM THE HIGH TO 20N105W. 
ANOTHER RIDGE AXIS EXTENDED SW THROUGH 27N140W. MODERATE TRADES 
OF 20 KT WERE NOTED FROM 5N-20N AND WEST OF 122W.

$$
ROBERTS