000
AXPZ20 KNHC 261547
TWDEP 

TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL                        
1605 UTC TUE MAR 26 2013

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 ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1545 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...            
THE MONSOON TROUGH AXIS EXTENDS FROM 08N78W TO 06N85W TO 03N90W. 
THE ITCZ AXIS EXTENDS FROM 01N110W TO 01N125W TO 03N135W TO 
BEYOND 03N140W. SCATTERED MODERATE WITHIN 60 NM OF THE MONSOON 
TROUGH. SCATTERED MODERATE WITHIN 60 NM OF THE ITCZ BETWEEN 122W 
AND 135W.

...DISCUSSION...
                                               
MOSTLY UPPER LEVEL ZONAL FLOW IS OVER THE NW AREA N OF 20N. AN 
UPPER LEVEL HIGH IS OVER THE TROPICS NEAR 5N150W...WHILE AN 
UPPER LEVEL TROUGH IS FROM 10S TO 10N BETWEEN 110W AND 130W. 
BROKEN HIGH CLOUDS ARE ON THE E SIDE OF THIS TROUGH FROM THE 
EQUATOR TO 10N BETWEEN 110W AND 120W.  
 
FURTHER E...BROAD UPPER LEVEL ANTICYCLONIC FLOW ANCHORED BY AN 
AN ANTICYCLONE OVER NW COLOMBIA COVERS THE FAR SE PORTION OF THE 
AREA. ASSOCIATED MODERATE TO STRONG SUBSIDENCE IS PRESENT. 

AT THE SURFACE ...A WEAK 1018 MB HIGH CENTER IS OVER THE NW AREA 
NEAR 30N130W WITH A RIDGE EXTENDING SE TO S OF SRN BAJA 
CALIFORNIA NEAR 20N110W. A WEAKENING COLD FRONT HAS ENTERED THE 
FAR NW PORTION OF THE AREA ALONG 31N136W 28N140W. THE FRONT HAS 
A WIND SHIFT WITH NO OTHER SIGNIFICANT IMPACT. THE HIGH CENTER 
IS FORECAST TO MOVE SW THROUGH WED. A WEAK PRES GRADEINT WILL 
CONTINUE WITH LIGHT WINDS AND RELATIVELY LOW SEAS OVER THE 
NW AREA FOR THE NEXT COUPLE OF DAYS.

GAP WINDS...                                                    
A GULF OF TEHUANTEPEC GALE IS IN PROGRESS. GALE FORCE WINDS ARE 
REACHING UP TO 40 KT WITH SOME BRIEF GUSTS TO 45 KT. THE PRES 
GRADIENT IS FORECAST TO BEGIN TO SLACKEN LATE WED INTO THU 
ALLOWING FOR THE GALE CONDITIONS TO DIMINISH LATE THU MORNING 
INTO EARLY THU AFTERNOON. SEAS ARE IN THE 10-17 FT RANGE...AND 
ARE FORECAST TO SUBSIDE TO 9-12 FT BY WED NIGHT.

A HIGH PRES RIDGE WILL INTERACT WITH GENERALLY LOWER PRES OVER 
COSTA RICA AND PANAMA TO INDUCE A GULF OF PAPAGAYO WIND EVENT 
WITH 20-25 KT BEGINNING WED MORNING. THESE WINDS WILL BRIEFLY 
DIMINISH TO 20 KT OR LESS WED EVENING...THEN INCREASE BACK TO 20-
25 KT LATE WED NIGHT INTO THU. 
 
$$
FORMOSA