000
AXPZ20 KNHC 221532
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC SUN APR 22 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...
ITCZ FROM 4N95W 5N105W 4N115W 6N125W 4N140W. SCATTERED MODERATE 
TO STRONG CONVECTION WITHIN 150 NM N AND 50 NM S OF AXIS FROM 
99W-103W.

...DISCUSSION...
AN UPPER LEVEL TROUGH IS OVER THE FAR NW PORTION OF THE 
DISCUSSION AREA N OF 25N ALONG 140W. OTHERWISE MOSTLY ZONAL 
UPPER LEVEL FLOW IS FROM 10N-25N WITH A 75-95 KT JETSTREAM FROM 
15N140W TO 17N121W. MODERATE TO STRONG SUBSIDENCE WITH DRY 
STABLE AIR AT THE MIDDLE AND UPPER LEVELS IS N OF 20N E OF 125W. 
UPPER LEVEL DIFFLUENT FLOW IS ENHANCING CONVECTION N OF THE ITCZ 
WITHIN 150 NM N AND 30 NM S OF AXIS FROM 99W-103W. IN THE DEEP 
TROPICS AN UPPER LEVEL CYCLONIC CIRCULATION IS CENTERED NEAR 
1N107W.

A 1016 MB HIGH IS CENTERED NEAR 22N120W. WEAK PRES GRADIENT IS 
RESULTING IN TRADES LESS THAN 20 KT. COLD FRONT EXTENDS FROM 
30N137W TO 26N140W. SCATTERED LIGHT SHOWERS ARE ALONG THE FRONT. 
NW WINDS TO 20 KT W OF THE FRONT. THE FRONT MOVES E TO 30N130W 
TO 23N135W MON AND WINDS W OF THE FRONT DECREASE TO LESS THAN 20 
KT HOWEVER NW SWELL TO 9 FT PROPAGATE INTO THE AREA BEHIND THE 
FRONT.

STRONG HIGH PRES WILL BUILDING BEHIND A STRONG LATE SEASON COLD 
FRONT MOVING THROUGH THE GULF OF MEXICO HAS TIGHTENED THE PRES 
GRADIENT ACROSS SOUTHERN MEXICO RESULTING IN WINDS TO GALE FORCE 
THROUGH THE GULF OF TEHUANTEPEC. NLY GALE FORCE WINDS ARE 
FORECAST TO INCREASE TO 40 KT MON MORNING.

$$
DGS