000
AXPZ20 KNHC 112206
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC WED APR 11 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

...ITCZ...
AXIS 8N83W 8N103W 4N120W 3N140W. SCATTERED MODERATE CONVECTION FROM 
4N TO 8N BETWEEN 88W AND 106W...AND WITHIN 60 NM OF 8N121W.

...DISCUSSION...
PROGRESSIVE PATTERN N OF 20N CONTINUES. SATELLITE IMAGERY SHOWS A 
SHORT WAVE TROUGH INTENSIFYING ALONG 111W AS AN UPPER RIDGE BUILDS 
UPSTREAM BETWEEN 120W AND 130W. TROUGH IS SPLITTING THE SUBTROPICAL 
JET INTO A NORTHERN BRANCH EXTENDING FROM 16N138W TO 23N125W TO SRN 
BAJA...AND SOUTHERN BRANCH FROM 16N110W ACROSS SRN MEXICO INTO GULF 
OF MEXICO. FURTHER SOUTH A WEAK UPPER LEVEL RIDGE OVERLIES THE ITCZ 
ROUGHLY ALONG 7-8N E OF 105W.

AT THE SURFACE...BROAD HIGH PRESSURE RIDGE EXTENDS FROM 34N140W TO 
17N108W. HEAT LOW IN NEAR LAS VEGAS NV CREATING TIGHT PRES GRADIENT 
ALONG SRN CALIF AND NRN BAJA. RESULTING STRONG NW WINDS GENERATING 
LARGE SWELLS AROUND 10-15 FT NEAR SAN DIEGO WHICH WILL CONTINUE TO 
PROPAGATE INTO FAR NE PORTION OF DISCUSSION AREA THEN DAMPEN OUT AS 
THEY MOVE FARTHER SOUTH W OF BAJA PENINSULA. THE HIGH PRES N OF THE 
AREA CENTERED NEAR 34N140W IS ALSO PRODUCING ENHANCED TRADE WIND 
FLOW W OF 125W...WHICH WILL GRADUALLY WEAKEN IN ABOUT 2-3 DAYS AS A 
LOW PRES TROUGH MOVES INTO THE NW PORTION OF THE AREA.

$$
MUNDELL