000
AXPZ20 KNHC 050917
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...ITCZ...AXIS 6N78W 7N93W 5N105W 7N140W. SCATTERED MODERATE 
CONVECTION WITHIN 90 NM S OF AXIS E OF 107W.

...DISCUSSION...
MORE PRONOUNCED RIDGE/TROUGH INTERACTION OCCURRING OVER SOUTHERN 
MEXICO AND CENTRAL AMERICA. UPPER TROUGH DIGGING SOUTHWARD INTO 
MEXICO ALONG 103W WHILE UPPER ANTICYCLONE REMAINS CENTERED NEAR 
PANAMA WITH RIDGE EXTENDING W TO 98W ALONG 8N. SPOTTY CONVECTION 
FIRING ALONG RIDGE/ITCZ AXIS S OF GUATEMALA AND EL SALVADOR IN 
RESPONSE TO DIVERGENT FLOW ALOFT. FURTHER WEST...ANOTHER TROUGH 
EXTENDING FROM 32N126W TO 18N135W IS PROGRESSING SLOWLY EASTWARD
AND WEAKENING AS IT INTERACTS WITH A RIDGE ALONG 115W.

AT THE SURFACE TRANSITION SEASON INACTIVITY CONTINUES. NO SIGNIFICANT
AREAS OF HIGHER WINDS AND SEAS ARE EVIDENT FROM QUIKSCAT AND SFC OBS.
MINOR CHANGES OCCUR IN THE 24-36 HOUR TIME FRAME AS THE TRAILING EDGE
OF A FRONT BRUSHES PAST THE EXTREME NW PART OF THE AREA...CAUSING A 
BRIEF INCREASE IN SW WINDS TO 25 KT AHEAD OF FRONT AND INTRODUCING NW
SWELLS TO 14-15 FT INTO NW PORTION. WEAK HIGH PRESSURE IN THE GULF OF
MEXICO CREATES ENOUGH OF A GRADIENT TO BRIEFLY INCREASE WINDS IN THE 
GULF OF TEHUANTEPEC TO 25 KT WITH SEAS RISING TO 8-9 FT. IN ADDITION 
A LARGE AREA OF S SWELLS PROPAGATING N FROM THE SOUTHERN HEMISPHERE 
WILL INCREASE SEAS TO 10-11 FT BEYOND 72 HOURS.

$
MUNDELL