000
AXPZ20 KNHC 111507
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC WED APR 11 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

MONSOON TROUGH IS FROM 3N96W TO 4N96W. ITCZ IS FROM 4N96W TO 
3N120W TO 5N134W TO 5N140W. SCATTERED MODERATE CONVECTION IS 
FROM 2N-05N BETWEEN 108W-123W.

DISCUSSION...
AN UPPER LEVEL TROUGH IS OVER THE FAR NW PORTION OF AREA N OF 
20N W OF 110W. THIS FEATURE IS SUPPORTING A SURFACE TROUGH. A 70 
KT JETSTREAM IS NOTED AROUND THE BASE OF THE TROUGH. UPPER LEVEL 
MOISTURE IS S AND E OF THE TROUGH ADVECTING NEWD. FURTHER E...AN 
UPPER LEVEL RIDGE IS OVER MEXICO N OF 20N BETWEEN 90W-110W. AN 
UPPER LEVEL TROUGH IS OVER THE TROPICS N OF 5N BETWEEN 90W-105W. 
ABUNDANT UPPER LEVEL TROPICAL MOISTURE AND BROKEN HIGH CLOUDS 
ARE E OF 100W.  

A SURFACE TROUGH EXTENDS FROM 30N117W TO 23N120W. WINDS ARE LESS 
THAN 20 KT N OF 15N W OF 118W. NW SWELLS ARE TO 10 FT. THE 
TROUGH WILL DISSIPATE WITHIN 24 HOURS. IN THE TROPICS A SURFACE 
TROUGH EXTENDS 10N85W TO 8N88W. SCATTERED MODERATE CONVECTION 
IS FROM 5N-10N BETWEEN 83W-87W. ANOTHER TROUGH IS FROM 5N93W TO 
1N94W. SCATTERED MODERATE TO ISOLATED STRONG CONVECTION IS FROM 
EQ-4N BETWEEN 93W-98W.

NLY WINDS 20-25 KT THROUGH THE GULF OF TEHUANTEPEC WILL DECREASE 
TO BELOW 20 KT BY THIS AFTERNOON.

HIGH PRES BUILDING W OF THE TROUGH HAS TIGHTENED THE PRESSURE 
GRADIENT ENOUGH FOR TRADES TO BE 20 KT FROM 4N-15N W OF 120W. 
THEY WILL INCREASE IN COVERAGE WITHIN THE NEXT 24-48 HOURS.

$$
FORMOSA