000
AXPZ20 KNHC 240927 CCA
TWDEP 

TROPICAL WEATHER DISCUSSION...CORRECTED                      
NWS NATIONAL HURRICANE CENTER MIAMI FL                           
1005 UTC WED APR 24 2013

CORRECTED FOR VALID TIMES

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 
0730 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... 
            
THE MONSOON TROUGH AXIS EXTENDS FROM COLOMBIA NEAR 04N77W TO 
05N89W WHERE IT TRANSITIONS TO ITCZ CONTINUING ON TO 07N100W TO  
06N115W TO 05N131W. NUMEROUS STRONG CONVECTION IS FROM 09N TO 
15N BETWEEN 98W AND 104W. SCATTERED MODERATE CONVECTION IS FROM 
06N TO 11N BETWEEN 101W AND 117W...ALSO FROM 02N TO 07N BETWEEN 
91W AND 99W. NUMEROUS MODERATE CONVECTION IS WITHIN 75 NM OF 
THE COAST OF MEXICO AND GUATEMALA. 
        
...DISCUSSION... 

NEAR GALE FORCE WINDS ARE EXPECTED TO DEVELOP IN THE GULF OF 
TEHUANTEPEC THURSDAY NIGHT WITH SEAS BUILDING UP TO 11 FEET DUE 
TO HIGH PRESSURE BUILDING IN THE WESTERN GULF OF MEXICO. 

A BURST OF STRONG CONVECTION DESCRIBED IN THE SECTION ABOVE IS 
BEING SUPPORTED BY UPPER LEVEL DIVERGENCE AND MID-LEVEL 
VORTICITY. THIS VORTICITY IS EXPECTED TO REFLECT AT THE SURFACE 
AS A TROUGH DURING THE NEXT 48 HOURS AND SHOWERS/THUNDERSTORMS 
WILL CONTINUE NEAR THE TROUGH.

A 1037 MB HIGH LOCATED NEAR 49N137W EXTENDS A RIDGE SW TO 25N45W 
AND THEN TAKES A SHARP TURN INTO THE FORECAST AREA TO 20N112W. 
THIS SUBTROPICAL RIDGE IS BEING DISRUPTED BY DEEP LAYERED LOW 
OVER NE FORECAST WATERS. THE ASSOCIATED SURFACE LOW WITH A 
MAGNITUDE OF 1012 MB IS LOCATED NEAR 33N125W AND EXTENDS A 
SURFACE TROUGH INTO THE FORECAST AREA THROUGH 29N125W TO 
25N130W. DUE TO THE INTERFERENCE FROM THIS LOW...THE SUBTROPICAL 
RIDGE HAS WEAKENED OVER THE FORECAST AREA RESULTING IN 
TRADEWINDS LESS THAN 20 KT. THERE IS NO SIGNIFICANT CONVECTION 
ASSOCIATED TO THIS LOW. WITHIN THE NEXT 48 HOURS...THE LOW IS 
EXPECTED TO WEAKEN AS IT MOVES EASTWARD.

A GALE WELL NORTH OF THE AREA OFF THE NORTHERN CALIFORNIA COAST 
IS PRODUCING NE SWELLS WITH SEAS 8 FT OR HIGHER EXPECTED TO MOVE 
INTO THE WATERS S OF 30N BETWEEN 130W AND 138W THIS MORNING. 
THESE SEAS SHOULD SUBSIDE BY THURSDAY EVENING.

FIRES INLAND FROM SOUTHERN MEXICO INTO NORTHERN COSTA RICA ARE 
SENDING PATCHY SMOKE INTO OFFSHORE WATERS. THESE CONDITIONS WILL 
LIKELY CONTINUE OVER THE NEXT FEW DAYS.

$$
JS/NR