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Eastern Pacific Tropical Discussion

Active Tropical Systems Basin Outlooks Satellite
Eastern Pacific Basin Tropical Discussion
 
646 
AXPZ20 KNHC 190912
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SAT APR 19 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...

GALE WARNING FOR THE GULF OF TEHUANTEPEC... 

HIGH PRES BUILDING BEHIND A COLD FRONT MOVING THROUGH THE GULF 
OF MEXICO HAS TIGHTENED THE PRES GRADIENT ACROSS SOUTHERN 
MEXICO RESULTING IN MINIMAL GALE FORCE WINDS THROUGH THE GULF 
OF TEHUANTEPEC. WINDS WILL QUICKLY DIMINISH THROUGHOUT THE DAY 
WITH ONLY N-NE 20-25 KT WINDS EXPECTED THIS EVENING THROUGH 
EARLY SUN...THEN 20 KT OR LESS BY SUN AFTERNOON.
  
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
 
MONSOON TROUGH FROM 10N85W TO 6N90W. ITCZ FROM 6N90W TO 4N110W 
TO 5N122W TO 5N140W. SCATTERED MODERATE TO STRONG CONVECTION 
FROM 4N-11N BETWEEN 116W-124W. 

...DISCUSSION...                                                

AN UPPER LEVEL RIDGE IS OVER THE FAR NW PORTION OF THE 
DISCUSSION AREA FROM 32N130W TO 20N140W. DOWNSTREAM UPPER LEVEL 
TROUGH EXTENDS FROM A CYCLONIC CIRCULATION CENTERED NEAR THE 
CALIFORNIA/MEXICO BORDER TO 18N127W. SW WINDS E OF THE TROUGH 
AXIS IS ADVECTING ABUNDANT MIDDLE AND UPPER LEVEL MOISTURE INTO 
NW MEXICO. A 95-100 KT JETSTREAM EXTENDS FROM 22N113W INTO 
NORTHERN MEXICO. IN THE DEEP AN UPPER LEVEL TROUGH EXTENDS FROM 
10N105W TO THE EQUATOR AT 106W.

SURFACE RIDGE IS N OF 15 W OF 111W. THE PRES GRADIENT BETWEEN 
THE RIDGE AND THE ITCZ IS SUPPORTING TRADES IN THE 15-20 KT 
RANGE WITH SEAS TO 8 FT IN MIXED NE AND S SWELL FROM 7N-20N W OF 
134W. THESE CONDITIONS ARE EXPECTED TO CONTINUE THROUGH THE NEXT 
DAY OR TWO. AN AREA OF NW SWELL 8 TO 10 FT IS FORECAST TO MOVE 
INTO THE FAR NW PORTION OF THE AREA SUN AND SPREAD SE ON MON.

$$
DGS