000
AXPZ20 KNHC 091503
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC WED APR 09 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 7N77W 4N105W 6N115W 4N140W. 
SCATTERED MODERATE TO STRONG CONVECTION WITHIN 60 NM EITHER SIDE 
OF AXIS FROM 77W TO 80W AND WITHIN 120 NM N OF AXIS FROM 
132W-137W. SCATTERED MODERATE CONVECTION 90 NM S OF AXIS FROM 
85W TO 99W.

...DISCUSSION...
MID/UPPER LEVEL TROUGH EXTENDS FROM ARIZONA ACROSS NORTHERN BAJA 
CALIFORNIA TO 27N128W. A 90-100 KT SUBTROPICAL JETSTREAM  WITH 
AXIS FROM 25N117W ACROSS THE MIDDLE GULF OF CALIFORNIA TO NEAR
EL PASO TEXAS. MODERATE TO STRONG SUBSIDENCE IS WITHIN 240 NM N 
OF THE JET. BROKEN HIGH CLOUDINESS LIES ALONG AND S OF THE 
SUBTROPICAL JET. MID/HIGH LEVEL CLOUDS ALONG THE PEAKS OF THE 
SIERRA MADRE OCCIDENTALS WITHIN THE MEXICAN STATES OF DURANGO 
AND CHIHUAHUA IMPLY THAT THE STRONG WESTERLIES ARE IMPINGING ON 
THE HIGHER TERRAIN. BROKEN/OVERCAST STRATOCUMULUS CLOUDS COVER 
THE PACIFIC N OF 10N W OF 110W.

UPPER LEVEL ANTICYCLONIC CIRCULATION OVER THE SW CORNER OF THE
DISCUSSION AREA NEAR 8N138W. DIFLUENT FLOW ALOFT IS ENHANCING
ITCZ CONVECTION S OF THE CIRCULATION. UPPER LEVEL TROUGH EXTENDS
FROM 20N118W TO CYCLONIC CIRCULATION NEAR 4N108W. A LARGE
ANTICYCLONIC CIRCULATION E OF THE TROUGH CENTERED OFF THE 
MEXICAN COAST NEAR 15N10W. STRONG SUBSIDENCE E OF THE UPPER 
HIGH IS LEADING TO FAIR CONDITIONS FROM CENTRAL MEXICO S TO
HONDURAS. UPPER LEVEL TROUGH WITH AXIS FROM THE NW CARIBBEAN
ACROSS NICARAGUA TO 7N90W. SW WINDS E OF THE TROUGH ARE
ADVECTING ITCZ MOISTURE INTO COSTA RICA AND PANAMA.

$$
DGS