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Eastern Pacific Tropical Weather Discussion



000
AXPZ20 KNHC 161514
TWDEP 

TROPICAL WEATHER DISCUSSION                  
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
1605 UTC WED APR 16 2014

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 
1415 UTC. 

...SPECIAL FEATURE...

GULF OF TEHUANTEPEC GALE WARNING 

HIGH PRESSURE IN THE WAKE OF A GULF OF MEXICO COLD FRONT 
CONTINUES TO SURGE WINDS THROUGH THE ISTHMUS OF TEHUANTEPEC AND 
INTO THE GULF OF TEHUANTEPEC AT GALE FORCE. WINDS WILL DIMINISH 
TO BELOW GALE BY THIS AFTERNOON. THE RESULTANT N-NE SWELL WILL 
PROPAGATE SW MIXING WITH LONG-PERIOD CROSS EQUATORIAL SWELL. 
SEAS WILL FINALLY SUBSIDE BELOW 8 FT NEAR 06N105W FRI. SOUTHERLY 
WINDS AT 5-15 KT ARE THEN EXPECTED EACH DAY THROUGH MON OVER THE 
GULF OF TEHUANTEPEC...WHILE LATE NIGHT DRAINAGE FLOW OF 10-20 KT 
ARE EXPECTED EACH NIGHT.   

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

ITCZ EXTENDS FROM 08N82W TO 06N90W TO 03N105W TO 05N125W TO 
03N140W. SCATTERED MODERATE TO ISOLATED STRONG CONVECTION IS 
FROM 06N TO 09N BETWEEN 83W AND 85W. SCATTERED MODERATE 
CONVECTION IS FROM 03N TO 07N BETWEEN 89W AND 92W...AND FROM 05N 
TO 08N BETWEEN 127W AND 132W. 

...DISCUSSION...                                                

IN THE UPPER LEVELS...A SHORT WAVE UPPER LEVEL TROUGH IS OVER 
THE NW CORNER DRIFTING E. A VERY LARGE UPPER LEVEL RIDGE IS 
ELSEWHERE W OF 110W. RIDGE AXIS EXTENDS FROM 0N128W TO N BAJA 
CALIFORNIA AT 31N115W. A 70 TO 90 KT SUBTROPICAL JETSTREAM WITH 
BROKEN TO OVERCAST HIGH CLOUDS EXTENDS FROM 20N140W TO N BAJA 
CALIFORNIA AT 31N115W. A SHARP UPPER LEVEL TROUGH IS BETWEEN 95W 
AND 110W. ANOTHER UPPER LEVEL RIDGE IS E OF 95W. EXPECT THE NW 
CORNER SHORTWAVE TROUGH TO MOVE E REACHING THE COAST OF THE 
NORTHERN BAJA PENINSULA BY FRIDAY. THIS WILL TEMPORARILY WEAKEN 
THE SURFACE RIDGE AND ALLOW THE TRADEWIND FLOW TO RELAX SLIGHTLY 
TO 15 TO 20 KT THROUGH THE END OF THE WEEK.

ON THE SURFACE...A 1028 MB HIGH IS CENTERED N OF THE AREA NEAR 
37N136W. SURFACE RIDGING IS N OF 15N W OF 115W. FRESH TO 
OCCASIONALLY STRONG TRADE WINDS SOUTH OF THE RIDGE AXIS COVERS 
THE AREA FROM 07N TO 19N W OF 125W. ALTIMETER DATA INDICATES 
SEAS TO 9 FT IN THIS AREA AS WELL. TRADE WINDS CONVERGENCE ALONG 
THE ITCZ IS SUPPORTING SCATTERED MODERATE CONVECTION BETWEEN 
127W AND 132W. ELSEWHERE...A TIGHT SURFACE PRESSURE GRADIENT 
BETWEEN THE SURFACE HIGH AND LOW PRESSURE OVER NW MEXICO IS 
PRODUCING LOCALLY FRESH NW FLOW ALONG THE PACIFIC COAST OF THE 
BAJA PENINSULA. 9 FT SWELL ARE N OF 29N BETWEEN 120W AND 127W. 
LASTLY...SOME 8 FT MIXED NW AND SW SWELL ARE S OF 00N W OF 105W. 
THIS SWELL WILL LAST FOR THE NEXT 36 HOURS. 

$$ 
FORMOSA



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Page last modified: Wednesday, 16-Apr-2014 15:14:32 UTC