000
AXPZ20 KNHC 172202
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC TUE APR 17 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

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

ITCZ AXIS EXTENDS FROM 06N87W TO A 1010 MB LOW NEAR 04N101W TO 
05N110W TO 04N120W TO 04N140W. SCATTERED MODERATE ISOLATED 
STRONG CONVECTION IS FROM 04N TO 08N BETWEEN 108W AND 125W. 

...DISCUSSION...

NEARLY STATIONARY 1025 MB HIGH PRES RIDGE IS CENTERED NEAR 
30N134W. A BROAD AREA OF MODERATE TO FRESH NE TRADE WINDS IS 
LOCATED S OF THE RIDGE WITH THE HIGHEST WINDS EVIDENT FROM 
SCATTEROMETER DATA FROM 06N TO 21N W OF 125W. SEA HEIGHTS 
CONTINUE TO GRADUALLY SUBSIDE ACROSS THE REGION.

EXPECT VERY LITTLE CHANGE TO THE CURRENT SYNOPTIC PATTERN FOR 
THE NEXT 24 HOURS. HIGH PRES RIDGE NEAR 30N134W WILL REMAIN 
NEARLY STATIONARY AND MODERATE TO FRESH TRADE WINDS WILL CONTINUE
S OF 23N W OF 130W...WITH SEAS SLOWLY SUBSIDING TO 8-9 FT BY THU.

A TIGHTER PRES GRADIENT IS EXPECTED TO DEVELOP ALONG THE COAST 
OF CALIFORNIA TONIGHT WITH NW WINDS INCREASING TO 25 KT N OF 30N.
NNW SWELL TO 9 FT AND 20 KT NLY WINDS CAN BE EXPECTED N OF 20N 
BETWEEN 116W AND 125W THU EVENING. 

MODEL GUIDANCE ALSO INDICATES THE POTENTIAL FOR 20-30 KT N WINDS 
IN THE GULF OF TEHUANTEPEC TONIGHT THROUGH EARLY THU.

$$
FORMOSA