000
AXPZ20 KNHC 070957
TWDEP 

TROPICAL WEATHER DISCUSSION                                     
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
1005 UTC TUE APR 07 2015

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 0930 UTC. 
 
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
          
A SURFACE TROUGH IS ALONG 04N77W 01N80W. CONVECTIVE 
PRECIPITATION...SCATTERED TO NUMEROUS STRONG FROM THE EQUATOR TO 
01N WITHIN 30 NM ON EITHER SIDE OF 80W...AND WITHIN 30 NM ON 
EITHER SIDE OF THE LINE FROM 00N84W TO 01S88W.

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

THE ITCZ IS ALONG 04N974W 02N109W 04N128W 05N140W. CONVECTIVE 
PRECIPITATION...SCATTERED TO NUMEROUS STRONG FROM 03N TO 04N 
BETWEEN 94W AND 95W...AND FROM 09N TO 11N W OF 136W. SCATTERED 
MODERATE TO ISOLATED STRONG WITHIN 120 NM S OF ITCZ BETWEEN 111W 
AND 120W...FROM 09N TO 11N BETWEEN 123W AND 130W...AND FROM 06N 
TO 08N BETWEEN 130W AND 132W

...DISCUSSION... 
    
A MIDDLE LEVEL TO UPPER LEVEL TROUGH PASSES THROUGH 32N129W TO 
26N136W BEYOND 20N140W. A COLD FRONT REACHES ITS SOUTHERNMOST 
POINT NEAR 30N134W. CYCLONIC WIND FLOW...AND COMPARATIVELY DRIER 
AIR THAT IS APPARENT IN WATER VAPOR IMAGERY...ARE TO THE 
NORTHWEST OF THE LINE THAT PASSES THROUGH 27N114W TO 18N130W 
BEYOND 12N140W.

AN UPPER LEVEL ANTICYCLONIC CIRCULATION CENTER IS NEAR 07N111W. 
UPPER LEVEL ANTICYCLONIC WIND FLOW COVERS THE EASTERN PACIFIC 
OCEAN BETWEEN 97W AND THE 27N114W-TO-12N140W LINE. MIDDLE LEVEL 
TO UPPER LEVEL CYCLONIC WIND FLOW...AND COMPARATIVELY DRIER AIR 
THAT IS APPARENT IN WATER VAPOR IMAGERY...ARE FROM 97W EASTWARD. 
A SURFACE RIDGE PASSES THROUGH 27N140W...TO 26N131W TO 29N119W 
TO 22N113W TO 18N106W. A COLD FRONT WILL PASS ALONG THE NORTHERN 
FRINGES OF THE FORECAST AREA DURING THE LATE NIGHT HOURS OF 
TUESDAY AND THE EARLY MORNING HOURS OF WEDNESDAY. EXPECT 
NORTHWEST WINDS 20 TO 25 KNOTS AND SEA HEIGHTS LOWER THAN 8 
FEET...IN ABOUT 18 HOURS...FROM 25N NORTHWARD FROM 116W 
EASTWARD. THESE CONDITIONS WILL LAST FOR ABOUT THE NEXT 18 HOURS 
OR SO...WEAKEN FOR ABOUT 6 HOURS OR SO...AND THEN START OVER 
AGAIN. 
 
THE SURFACE PRESSURE GRADIENT IS SUPPORTING NORTHEAST TRADE WIND 
FLOW OF 15 TO 20 KNOTS GENERALLY IN THE AREA FROM 07N TO 16N 
FROM 122W WESTWARD...DURING THE NEXT 48 HOURS. EXPECT SEA 
HEIGHTS TO REACH 8 FEET IN MIXED NORTHEAST...SOUTH...AND 
NORTHWEST SWELL.
   
THE GULF OF CALIFORNIA...EXPECT NORTHWEST WINDS 20 TO 25 KNOTS 
AND SEA HEIGHTS LOWER THAN 8 FEET AROUND SUNSET ON TUESDAY INTO 
THE MIDNIGHT HOURS OF WEDNESDAY...FROM 23N TO 25N FROM 109W 
EASTWARD.

THE GULF OF TEHUANTEPEC...EXPECT A NORTHERLY DRAINAGE WIND FLOW 
OF 20 TO 25 KNOTS...FROM THE SUNRISE HOURS UNTIL THE MIDDAY 
HOURS TODAY ON TUESDAY...AND TOMORROW ON WEDNESDAY. 
 
THE GULF OF PAPAGAYO...EXPECT NORTHEAST WINDS 20 TO 30 KNOTS AND 
SEA HEIGHTS FROM 8 TO 10 FEET...STARTING AROUND SUNRISE TODAY 
AND STOPPING AROUND SUNSET. 8 TO 9 FOOT SEA HEIGHTS WITH WIND 
SPEEDS 20 KNOTS OR LESS WILL CONTINUE FROM SUNSET TONIGHT INTO 
THE EARLY MORNING HOURS OF WEDNESDAY. THE 20 TO 30 KNOT WINDS 
WILL START AGAIN FROM THE EARLY MORNING HOURS OF WEDNESDAY UNTIL 
THE MIDDAY HOURS OF WEDNESDAY...DYING DOWN FOR ABOUT 12 HOURS OR 
SO. NORTHEAST WINDS 20 TO 25 KNOTS WILL START AGAIN DURING THE 
EARLY MORNING HOURS OF THURSDAY. 

THE GULF OF PANAMA...EXPECT NORTH WINDS 20 TO 25 KNOTS AND SEA 
HEIGHTS LOWER THAN 8 FEET...FOR THE NEXT 6 HOURS OR SO. THE WIND 
SPEEDS WILL SLOW DOWN DURING THE TIME PERIOD FROM SUNRISE INTO 
THE LATER MORNING HOURS.

$$
MT