000
AXPZ20 KNHC 200344
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC MON APR 20 2009

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0300 UTC.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE AXIS LIES ALONG 05N77W TO 
04N90W TO 09N105W TO 04N140W. SCATTERED MODERATE CONVECTION IS 
FROM 05N TO 10N BETWEEN 117W AND 125W.

...DISCUSSION...
A 1028 MB HIGH IS LOCATED OFF THE COAST OF CALIFORNIA NEAR 
40N130W. THIS HIGH IS MOVING FURTHER N AND IS LESSENING THE 
SURFACE GRADIENT AND SURFACE WINDS W OF BAJA CALIFORNIA. 
CONVECTION IS CONFINED TO NEAR THE ITCZ WITH GFS MODEL 
PRECIPITATION POTENTIAL INDICATED S OF 10N. PAPAGAYO GAP WINDS 
OF 20 KT AND SEAS OF 8 FT ARE FORECAST TO PERSIST FOR THE NEXT 
48 HOURS. PANAMA GAP WINDS OF 20 KT AND SEAS LESS THAN 8 FT ARE 
ALSO FORECAST FOR THE NEXT 48 HOURS. A TEHUANTEPEC GALE IS 
FORECAST IN 30 HOURS AS A COLD FRONT PUSHES E OVER THE GULF OF 
MEXICO TO THE YUCATAN PENINSULA. A COLD FRONT IS APPROACHING 
140W IN 48 HOURS WITH CONVECTION.     

IN THE UPPER LEVELS...AN UPPER LEVEL LOW IS CENTERED NEAR 
29N132W. ZONAL FLOW IS ELSEWHERE W OF 100W. AN UPPER LEVEL RIDGE 
IS N OF THE EQUATOR E OF 100W. EXPECT THE UPPER LEVEL LOW TO 
MOVE N OVER THE NEXT 24 HOURS AND LEAVE A ZONAL PATTERN N OF 
20N. A BROAD UPPER LEVEL RIDGE WILL BUILD S OF 20N W OF 100W 
WHILE AN UPPER LEVEL TROUGH WILL BUILD E OF 100W OVER THE NEXT 
48 HOURS.   

$$
FORMOSA