000
AXPZ20 KNHC 160359
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC FRI AUG 16 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0300 UTC.
                                      
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...           
MONSOON TROUGH EXTENDS FROM 10N86W TO 13N100W TO A 1008 MB LOW 
PRES NEAR 12N110W TO 13N118W TO 06N137W. SCATTERED MODERATE 
ISOLATED STRONG CONVECTION IS WITHIN 120 NM S OF THE TROUGH 
BETWEEN 103W AND 106W. SCATTERED MODERATE TO STRONG CONVECTION 
WITHIN 150 NM N OF THE TROUGH BETWEEN 109W AND 114W.

...DISCUSSION...                                                 
AN UPPER LEVEL TROUGH ACROSS NW PORTION OF THE DISCUSSION AREA 
EXTENDS FROM 32N135W TO 26N140W. AN UPPER LEVEL RIDGE EXTENDS SW 
FROM BROAD ANTICYCLONE CENTERED OVER NORTHERN MEXICO TO 13N130W. 
INVERTED TROUGH IS S OF THE UPPER RIDGE FROM CENTRAL MEXICO TO 
16N110W. DEEP LAYER MOISTURE IS FROM 09N-15N BETWEEN 97W-130W.

A WEAK HIGH CENTERED NEAR 28N138W EXTENDS RIDGE E-SE TO 21N112W. 
THE WEAK PRESSURE GRADIENT BETWEEN THE RIDGE AND LOWER PRESSURE 
ASSOCIATED WITH THE CONVERGENCE ZONE IS MAINTAINING MODERATE ENE 
TRADE WINDS WITHIN 450 NM N OF THE MONSOON TROUGH AXIS. LITTLE 
CHANGE IS EXPECTED THE NEXT 2-3 DAYS. SEA HEIGHTS ARE LESS THAN 
8 FT ACROSS THE ENTIRE DISCUSSION AREA...AND SEAS ARE EXPECTED 
TO CONTINUE TO GRADUALLY SUBSIDE THROUGH THE WEEKEND. 

ENHANCED NORTHERLY GAP WINDS IN THE GULF OF TEHUANTEPEC WILL 
CONTINUE TO PULSE TO NEAR 20 KT DURING THE NEXT 12-24 HOURS.

$$
MUNDELL