000
AXPZ20 KNHC 051510
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU APR 05 2007

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS 
BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

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

...ITCZ...
7N78W 5N105W 5N120W 7N140W. SCATTERED MODERATE TO STRONG 
CONVECTION FROM 5N TO 10N BETWEEN 80W AND 85W AND WITHIN WITHIN 
90 NM S OF AXIS FROM 104W TO 108W.

...DISCUSSION...
MID/UPPER LEVEL TROUGH EXTENDS FROM AN UPPER LEVEL CYCLONIC 
CIRCULATION NEAR 32N125W TO 25N125W TO 17N140W. MODERATE TO 
STRONG SUBSIDENCE IS S OF 25N W OF THE TROUGH AXIS. ABUNDANT 
TROPICAL MOISTURE IS BEING ADVECTED NWD E OF THE TROUGH TO THE 
BAJA PENINSULA AND INTO CALIFORNIA AND ARIZONA. TRANSVERSE
BANDING IS ON CIRRUS CLOUDS...INDICATING POSSIBLE HIGH LEVEL 
TURBULENCE...IS WITHIN 180 NM S OF LINE 16N128W TO 25N115W.
AN UPPER LEVEL RIDGE IS BUILDING OVER THE FAR NW PORTION OF THE 
DISCUSSION AREA W OF THE TROUGH. AN UPPER LEVEL RIDGE E OF THE 
TROUGH WITH AXIS FROM SOUTHERN ARIZONA TO 16N111W. MID/UPPER 
LEVEL
TROUGH EXTENDS FROM THE GULF OF MEXICO ACROSS SOUTHERN MEXICO TO
13N98W. UPPER LEVEL RIDGE WITH AXIS FROM COLOMBIA TO HONDURAS 
AND NICARAGUA. DIVERGENT FLOW ALOFT IS ENHANCING ITCZ CONVECTION 
E OF 85W.

A 1022 MB HIGH PRES IS CENTERED NEAR 30N128W WITH RIDGE FROM THE 
HIGH TO 18N111W. COLD FRONT MOVING THROUGH THE BAY OF CAMPECHE 
AND SOUTHERN MEXICO HAS TIGHTENED THE PRES GRADIENT FOR STRONG N 
WINDS THROUGH THE GULF OF TEHUANTEPEC.

$$
DGS