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872 
AXPZ20 KNHC 180905
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC FRI APR 18 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC. 

...SPECIAL FEATURE...

HIGH PRES BUILDING W OF COLD FRONT MOVING THROUGH THE GULF OF 
MEXICO WILL INCREASE NORTHERLY WINDS TO 20-25 KT INTO THE GULF 
OF TEHUANTEPEC ON LATE TODAY WITH MINIMAL GALE CONDITIONS 
EXPECTED BY TONIGHT THROUGH EARLY SAT...THEN QUICKLY DIMINISHING 
THROUGHOUT THE DAY ON SAT WITH ONLY 15-20 KT N WINDS EXPECTED BY 
SAT EVENING.
  
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

ITCZ FROM 7N85W TO 5N100W TO 8N115W TO 6N132W. SCATTERED 
MODERATE ISOLATED STRONG CONVECTION WITHIN 130 NM S OF AXIS FROM 
88W-102W AND FROM 3N-7N BETWEEN 125W-135W.

...DISCUSSION...                                                

AN UPPER LEVEL RIDGE IS OVER THE FAR NW CORNER OF THE DISCUSSION 
AREA. DOWNSTREAM UPPER LEVEL TROUGH EXTENDS FROM A CYCLONIC 
CIRCULATION CENTERED NEAR 32N120W TO 20N124W. SW WINDS E OF THE 
TROUGH AXIS IS ADVECTING ABUNDANT MIDDLE AND UPPER LEVEL 
MOISTURE INTO BAJA CALIFORNIA AND NW MEXICO. IN THE DEEP TROPICS 
AN UPPER LEVEL RIDGE EXTENDS FROM AN ANTICYCLONIC CIRCULATION 
NEAR 7N132W NE TO 16N101W. UPPER LEVEL DIFFLUENCE ASSOCIATED 
WITH THE ANTICYCLONE IS ENHANCING CONVECTION FROM 3N-7N BETWEEN 
125W-135W. AN UPPER LEVEL CYCLONIC CIRCULATION IS CENTERED NEAR 
8N104W.

SURFACE RIDGE IS N OF 14N W OF 108W. THE GRADIENT BETWEEN THE 
RIDGE AND THE ITCZ IS SUPPORTING 15-20 KT WINDS FROM 5N-18N W OF 
135W WITH SEAS TO 9 FT IN MIXED NE AND S SWELL. THESE CONDITIONS 
ARE EXPECTED THROUGH THE NEXT DAY OR TWO. AN AREA OF NW SWELL TO 
8 FT IS N OF 28N BETWEEN 123W-128W. THE SEAS WILL SUBSIDE TO 
BELOW 8 FT SAT.

$$
DGS




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