000
AXPZ20 KNHC 260319
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SAT APR 26 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 
0315 UTC.

...ITCZ...
ITCZ AXIS ALONG 04N77W 06N100W 03N120W 02N140W. SCATTERED 
MODERATE/ISOLATED STRONG CONVECTION WITHIN 50 NM OF AXIS BETWEEN 
101W AND 103W. SCATTERED MODERATE FROM 04N TO 06N BETWEEN 125W 
TO 128W.

...DISCUSSION...
MID TO UPPER LEVEL RIDGE BUILDS/AMPLIFIES 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 EXTENDING 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. AN EARLIER 
ASCAT OVERPASS AND SHIP REPORT IN THE GULF OF PANAMA SUGGEST 
THAT 20 KT NORTHERLY FLOW PERSISTS OVER THE AREA N OF 5N...BUT 
IS EXPECTED TO BE A 24 HR SHORT-LIVED EVENT.

$$
ROBERTS