000
AXPZ20 KNHC 121502
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC SAT APR 12 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 
1500 UTC.

...ITCZ...
ITCZ AXIS IS CENTERED ALONG 3N78W 1N90W 5N120W 4N140W. SCATTERED 
MODERATE ISOLATED STRONG CONVECTION WITHIN 240 NM N OF AXIS FROM 
90W-94W AND WITHIN 90 NM S OF AXIS FROM 103W-111W AND WITHIN 150 
NM N OF AXIS FROM 127W-130W.

...DISCUSSION...
AN ELONGATED MID/UPPER LEVEL CYCLONE NEAR 22N124W WITH AN 
ASSOCIATED TROUGH EXTENDING SSW TO 12N134W. A MID/UPPER LEVEL 
RIDGE IS NW OF THE CYCLONIC CIRCULATION/TROUGH...WITH MODERATE 
TO STRONG SUBSIDENCE BETWEEN THE RIDGE AND TROUGH FROM 15N-30N 
BETWEEN 125W-135W. MID/UPPER LEVEL TROUGH OVER THE SRN GREAT 
PLAINS EXTENDS SW INTO THE REGION ACROSS NRN BAJA CALIFORNIA TO 
THE CYCLONIC CIRCULATION NEAR 22N124W. SW WINDS ALOFT SE OF THE 
TROUGH IS ADVECTING HIGH LEVEL MOISTURE FROM THE ITCZ NE TO 
SOUTHERN BAJA AND CENTRAL MEXICO. BROAD MID/UPPER LEVEL 
ANTICYCLONIC FLOW GENERALLY COVERS THIS AREA E OF 110W WITH A 
MEAN RIDGE AXIS EXTENDING FROM COLOMBIA ACROSS CENTRAL AMERICA
THEN INTO SOUTHERN MEXICO. MODERATE TO STRONG SUBSIDENCE IS N
OF THE RIDGE AXIS WITH MOSTLY FAIR WEATHER CONDITIONS. S OF THE
RIDGE IS A VERY MOIST PATTERN THROUGH ALL LEVELS OF THE 
ATMOSPHERE WITH SCATTERED SHOWERS AND TSTMS.

A NEARLY STATIONARY SURFACE 1008 MB LOW IS CENTERED NEAR 8N89W.
EARLIER CONVECTION ASSOCIATED WITH THE LOW HAS DISSIPATED. A 
SURFACE RIDGE EXTENDS FROM A 1025 MB HIGH PRES JUST N OF THE 
AREA NEAR 33N134W TO 25N127W TO 18N115W. BROKEN/OVERCAST 
STRATOCUMULUS CLOUDS WITHIN THE RIDGE N OF 13N W OF 125W AND 
FROM 13N-23N BETWEEN 115W-125W.

$$
DGS