000
AXPZ20 KNHC 210324
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SAT APR 21 2012

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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0300 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH IS FROM 09N85W TO 05N94W TO 07N115W TO 06N124W. 
ITCZ IS FROM 06N124W TO 03N140W. SCATTERED MODERATE CONVECTION 
IS FROM 05N TO 10N BETWEEN 114W AND 120W. 

...DISCUSSION...
AN UPPER LEVEL ANTICYCLONIC CIRCULATION IS CENTERED NEAR 31N119W.
OTHERWISE MOSTLY ZONAL UPPER LEVEL FLOW IS FROM 10N-25N WITH AN 
80 KT JETSTREAM FROM 15N140W TO 15N120W TO ACROSS SOUTHERN 
MEXICO AT 20N97W. MODERATE TO STRONG SUBSIDENCE WITH DRY STABLE 
AIR AT THE MIDDLE AND UPPER LEVELS IS N OF 15N. IN THE DEEP 
TROPICS AN UPPER LEVEL HIGH IS CENTERED NEAR 10N100W. UPPER 
LEVEL DIFFLUENT FLOW IS ENHANCING CONVECTION N OF THE ITCZ FROM 
110W-120W.

A 1024 MB HIGH IS CENTERED NEAR 33N135W. A COLD FRONT FURTHER W 
WILL APPROACH THE DISCUSSION AREA SAT NIGHT. NW WINDS ARE 
FORECAST TO INCREASE TO 20 KT W OF THE FRONT. ELY TRADES TO 20 
KT AROUND THE SOUTHERN PERIPHERY OF THE HIGH FROM 05N-10N W OF 
135W WILL DECREASE TO LESS THAN 20 KT BY SAT AS THE HIGH WEAKENS.

HIGH PRES WILL BUILD BEHIND A STRONG LATE SEASON COLD FRONT 
MOVING THROUGH THE GULF OF MEXICO. THIS WILL TIGHTEN THE PRES 
GRADIENT ACROSS SOUTHERN MEXICO RESULTING IN WINDS TO GALE FORCE 
THROUGH THE GULF OF TEHUANTEPEC SAT NIGHT.

$$
FORMOSA