000
AXPZ20 KNHC 251515
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC FRI APR 25 2008

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

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1515 UTC.

...ITCZ...
ITCZ AXIS ALONG 3N78W 7N85W 4N110W 2N140W. SCATTERED MODERATE TO
STRONG WITHIN 240 NM N OF AXIS BETWEEN 110W AND 115W. SCATTERED 
MODERATE/ISOLATED STRONG WITHIN 120 NM OF AXIS BETWEEN 116W AND 
122W...AND WITHIN 90-120 NM OF THE AXIS W OF 127W. WIDELY 
SCATTERED MODERATE WITHIN 120 NM OF THE AXIS BETWEEN 78W AND 
100W. 

...DISCUSSION...
PATTERN HAS BECOME SLIGHTLY MORE AMPLIFIED OVER THE DISCUSSION 
AREA WITH A MID/UPPER LEVEL RIDGE OVER THE W PORTION OF THE 
DISCUSSION AREA EXTENDING FROM  AN ANTICYCLONIC CIRCULATION 
CENTER NEAR 12N128W NW THROUGH 20N133W 30N135W. 100-110 KT SWLY 
UPPER LEVEL JET WAS ADVECTING COPIOUS AMOUNTS OF MAINLY HIGH 
LEVEL MOISTURE OVER THE RIDGE MAINLY W OF 130W. UPPER LEVEL JET 
CONTINUES EWD...THOUGH MUCH WEAKER...THROUGH THE BASE OF A BROAD
UPPER LEVEL TROUGH N OF 23N BETWEEN 100W AND 125W...GENERALLY
OVER NRN MEXICO AND BAJA CALIFORNIA. MODERATE TO STRONG 
SUBSIDENCE WAS NOTED WITHIN THE BROAD TROUGH. TO THE S OF THE 
TROUGH...ANOTHER UPPER LEVEL TROUGH/SHEAR AXIS EXTENDS FROM  
20N115W SWWD TO 5N125W. UPPER LEVEL DIFLUENT FLOW E OF THE SHEAR 
AXIS WAS ENHANCING DEEP CONVECTION WITHIN 240 NM OF THE ITCZ 
BETWEEN 110W AND 115W. DIFLUENT FLOW WAS ALSO ENHANCING DEEP 
CONVECTION ALONG THE ITCZ W OF 127W. 

AN UPPER LEVEL RIDGE EXTENDS FROM NRN COLOMBIA WESTWARD OVER 
PANAMA AND COSTA RICA TO 12N108W. MOSTLY DRY AIR IS NOTED N OF 
THE RIDGE AXIS WITH ABUNDANT TROPICAL MOISTURE S OF THE RIDGE 
AXIS. SOMEWHAT DIFLUENT FLOW WAS ALSO ENHANCING WIDELY SCATTERED 
CONVECTION WITHIN 180 NM OF THE ITCZ BETWEEN 78W AND 100W. 

AT THE SURFACE...A 1028 MB HIGH PRES N OF THE AREA NEAR 35N128W 
WITH ASSOCIATED RIDGE SE FROM THE HIGH TO 30N125W TO 15N108W. 
ANOTHER RIDGE AXIS EXTENDED SW THROUGH 26N140W. MODERATE TRADES 
OF 20 KT WERE NOTED FROM 5N-20N AND WEST OF 120W. TRADES WERE 
ADVECTING AREAS BROKEN STRATOCUMULUS CLOUDS IN THE AREA N OF 
15N W OF 125W.

$$
COBB