000
AXPZ20 KNHC 090918
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC MON APR 9 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
ITCZ AXIS 3N110W 3N120W. SCATTERED STRONG CONVECTION WITHIN 150 
NM N OF AXIS FROM 115W-120W.

DISCUSSION...
UPPER LEVEL TROUGH OVER THE FAR NW PORTION OF THE AREA WITH AXIS 
FROM 32N136W TO 23N140W. A 95-105 KT SLY JETSTREAM IS SE OF THE 
TROUGH FROM 32N136W TO 23N140W. DENSE CIRRUS CLOUDS WITHIN 180 
NM SE OF THE JET. AN UPPER LEVEL RIDGE IS E OF THE TROUGH N OF 
20N E OF 115W. IN THE DEEP TROPICS AN UPPER LEVEL TROUGH EXTENDS 
FROM 15N110W TO THE EQUATOR AT 91W. MODERATE TO STRONG 
SUBSIDENCE WITH DRY STABLE AIR AT THE MIDDLE AND UPPER LEVELS IS 
N OF 10N E OF 115W. OTHERWISE SCATTERED SHOWERS ARE SE OF THE 
TROUGH AXIS.

COLD FRONT EXTENDS FROM 32N128W TO 22N140W. SCATTERED SHOWERS 
ARE WITHIN 150 NM E OF THE FRONT. LARGES NW SWELLS UP TO 14 FT 
ARE W OF THE COLD FRONT. THE FRONT WILL MOVE TO 32N124W TO 
21N132W BY TONIGHT. SURFACE HIGH PRES OVER THE BAY OF CAMPECHE 
HAS TIGHTENED THE PRES GRADIENT ACROSS SOUTHERN MEXICO WITH NLY 
WINDS 20 TO 25 KT BLOWING THROUGH THE GULF OF TEHUANTEPEC WITH 
SEAS BUILDING TO 10 FT TONIGHT THE DECREASE TUE EVENING.

CROSS EQUATORIAL SW SWELL TO 9 FT S OF 10N W OF 105W WILL 
GRADUALLY DECREASE IN HEIGHT AND COVERAGE THROUGH TONIGHT.

$$
DGS