000
AXPZ20 KNHC 140901
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC WED AUG 14 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.
                                      
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...           

THE MONSOON TROUGH EXTENDS FROM 11N86W TO 11N87W TO 10N97W TO 
11N108W TO 10N125W. SCATTERED MODERATE CONVECTION WAS NOTED 
WITHIN 90 NM N OF TROUGH BETWEEN 96W AND 109W. ISOLATED MODERATE 
TO STRONG CONVECTION WAS NOTED FROM 06N TO 12N BETWEEN 113W AND 
125W.

...DISCUSSION...                                                 

A WEAK 1021 MB SURFACE HIGH IS ANALYZED NEAR 29N132W WITH 
ASSOCIATED RIDGE EXTENDING SE TO 22N113W. A DISSIPATING LOW 
PRESSURE IS CENTERED NEAR 13.5N138W. THE WEAK PRESSURE GRADIENT 
BETWEEN THIS RIDGE AND A TROUGH OVER MEXICO IS PRODUCING MAINLY 
MODERATE NNW WINDS ALONG THE W COAST OF BAJA CALIFORNIA WITH 
SEAS TO 4-5 FT.
 
THE PRESSURE GRADIENT BETWEEN THE AREA OF HIGH PRESSURE AND THE 
WEAKENING LOW PRESSURE CENTER MENTIONED ABOVE IS MAINTAINING 
FRESH TO STRONG WINDS WITHIN 240 NM N SEMICIRCLE OF THE LOW WITH 
SEAS TO 9 FT. THE LOW WILL CONTINUE TO WEAKEN AND SHIFT W OF THE 
FORECAST AREA TODAY. ASSOCIATED WINDS AND SEAS WILL DECREASE 
BELOW ADVISORY CRITERIA THU. OTHER THAN THIS AREA...A WEAK 
PRESSURE GRADIENT PREVAILS ACROSS THE AREA WITH NO SIGNIFICANT 
SWELLS MOVING THROUGH THE AREA. AS A RESULT...WINDS AND SEAS 
OVER THE REST OF THE FORECAST AREA WILL REMAIN BELOW ADVISORY 
CRITERIA. 

$$ 
AL