000
AXPZ20 KNHC 280915
TWDEP 

TROPICAL WEATHER DISCUSSION   
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC WED MAR 28 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 4N120W 5N130W 06N140W. SCATTERED MODERATE CONVECTION 
FROM 7N-17N BETWEEN 129W-140W.

...DISCUSSION...
BROAD UPPER LEVEL TROUGH FROM 32N133W TO A CYCLONIC CIRCULATION 
W OF THE AREA NEAR 20N143W. AN UPPER LEVEL RIDGE EXTENDS FROM 
21N136W TO 10N125W. UPPER LEVEL DIFFLUENT FLOW IS ENHANCING 
CONVECTIVE ACTIVITY FROM 9N-15N W OF 130W. AN UPPER LEVEL 
SHORTWAVE TROUGH IS APPROACHING THE BAJA PENINSULA. NO WEATHER 
WITH THE TROUGH DUE TO DRY AIR AT THE MIDDLE AND UPPER LEVELS.
OTHERWISE MOSTLY ZONAL UPPER LEVEL FLOW ACROSS THE AREA. A 
90-110 KT JET ENTERS THE DISCUSSION AREA FROM 14N140W TO 16N120W 
15N110W. MODERATE TO STRONG SUBSIDENCE WITH DRY STABLE 
AIR AT THE MIDDLE AND UPPER LEVELS IS N OF 5N E OF 100W.

DISSIPATING COLD FRONT ENTERS THE NW PORTION OF THE AREA FROM 
32N127W TO 25N140W. LARGE NW SWELLS TO 13 FT ARE NW OF THE 
FRONT. THE FRONT WILL DISSIPATE LATER TODAY HOWEVER THE NW 
SWELLS TO 12 FT FRONT WILL SPREAD SE.

ELY TRADES FROM 10N-15N W OF 120W WILL PERSIST THROUGH THU. 
LARGE NW SWELL WILL MERGE WITH SW SWELL FROM THE SOUTHERN 
HEMISPHERE TONIGHT.

PERSISTENT SURFACE TROUGH FROM 7N94W TO 6N91W. ISOLATED SHOWERS 
ARE WITHIN 90 NM S OF THE TROUGH AXIS.

$$
DGS