000
AXPZ20 KNHC 061527
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC FRI APR 06 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 
1200 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH 8N83W 3N110W. ITCZ FROM 3N110W 4N130W 3N140W. 
SCATTERED STRONG CONVECTION WITHIN 150 NM S OF AXIS FROM 83W TO 
85W.

DISCUSSION...
BROAD UPPER LEVEL TROUGH IS ACROSS THE DISCUSSION AREA N OF 10N 
W OF 130W. AN UPPER LEVEL RIDGE IS E OF THE TROUGH N OF 15N TO 
THE COAST OF MEXICO. MODERATE TO STRONG UPPER LEVEL SUBSIDENCE 
WITH DRY AND STABLE AIR AT THE MIDDLE AND UPPER LEVELS IS FROM 
7N TO 20N W OF 105W. UPPER LEVEL TROUGH IS APPROACHING THE 
MEXICAN COAST FROM 10N100W TO 5N100W. AN UPPER LEVEL RIDGE 
EXTENDS FROM AN ANTICYCLONIC CIRCULATION OVER COLOMBIA NW ACROSS 
CENTRAL AMERICA TO THE YUCATAN PENINSULA. ABUNDANT MOISTURE IS  
BETWEEN THE TROUGH AND RIDGE AXIS WITH SCATTERED SHOWERS AND 
TSTMS.

STRONG SURFACE HIGH PRES N OF THE DISCUSSION AREA COMBINED WITH  
LOWER PRES OVER NORTHERN MEXICO IS PRODUCING A TIGHT ENOUGH PRES 
GRADIENT FOR 20 KT NLY WINDS N OF AROUND 24N W OF 130W WITH NW 
SWELLS TO 13 FT. A SMALL AREA OF 20 KT TRADES ARE FROM 5N-15N W 
OF 125W WITH SEAS TO 9 FT IN MIXED SW AND NW SWELL. COLD FRONT 
IS FORECAST TO MOVE INTO THE NW CORNER FROM 30N137W TO 28N140W 
SAT MORNING. NW SWELL WITH BUILD BEHIND THE FRONT. 

$$
DGS