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Eastern Pacific Tropical Discussion

Active Tropical Systems Basin Outlooks Satellite
Eastern Pacific Basin Tropical Discussion
 
963 
AXPZ20 KNHC 222159
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
2205 UTC WED OCT 22 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2145 UTC.                       

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

MONSOON TROUGH AXIS EXTENDS FROM PANAMA NEAR 08N78W THEN MOSTLY 
OVERLAND ACROSS CENTRAL AMERICA TO GUATEMALA NEAR 14N90W THEN TO 
10N100W TO 10N110W TO 10N120W TO 09N130W TO 09N140W. SCATTERED 
MODERATE CONVECTION IS NOTED WITHIN 120 NM S OF TROUGH BETWEEN 
85W AND 95W. SCATTERED MODERATE ISOLATED STRONG CONVECTION IS 
OBSERVED WITHIN 150 NM N OF TROUGH AND 120 NM BETWEEN 120W AND 
135W.

...DISCUSSION...

RICH DEEP LAYER MOISTURE COMBINED WITH CONVERGENT SW FLOW INTO 
THE MONSOON TROUGH IS SUPPORTING AREAS OF SHOWERS AND 
THUNDERSTORMS OVER MUCH OF THE TROPICAL EASTERN PACIFIC N OF 06N 
AND EAST OF 100W. 

FOR THE GULF OF TEHUANTEPEC...HIGH PRES WILL BUILD TONIGHT AND 
THU OVER NE MEXICO AND THE WESTERN GULF OF MEXICO IN THE WAKE OF 
A TROPICAL DEPRESSION CURRENTLY IN THE SW GULF HEADING TOWARD 
THE WEST COAST OF THE YUCATAN PENINSULA. THIS WILL ESTABLISH A 
TIGHT PRES GRADIENT ACROSS THE ISTHMUS OF TEHUANTEPEC AND LEAD 
TO STRONG GAP WINDS PUSHING INTO THE GULF OF TEHUANTEPEC THU 
NIGHT INTO FRI MORNING. A SECOND REINFORCING GAP WIND EVENT WILL 
OCCUR FRI NIGHT INTO SAT MORNING. THE PERSIST GAP FLOW WILL 
ALLOW SHORT PERIOD N AND NE SEAS WITH HEIGHTS OF 8 TO 12 FT TO 
REACH AS FAR TO THE S AND SW AS 500 NM SSW OF THE GULF OF 
TEHUANTEPEC BY SAT MORNING...MIXING WITH LONGER PERIOD NW SWELL. 
THIS GAP WIND EVENT WILL REMAIN JUST BELOW GALE 
FORCE...IT WILL LIKELY PERSIST THROUGH SUN.

FARTHER WEST...1022 MB HIGH PRES CENTERED NEAR 30N135W IS 
MAINTAINING LIGHT TO MODERATE TRADE WIND FLOW W OF 110W. THE 
MAIN MARINE ISSUE IS LONG PERIOD NW SWELL REACHING 8 TO 10 FT 
ACROSS MUCH OF THE AREA N OF 08N W OF 120W. THIS WILL CONTINUE 
TO PROPAGATE TO THE SOUTH AND SOUTHEAST...EVENTUALLY MIXING WITH 
SW SWELL MOVING ACROSS THE EQUATOR IN THE NEXT 24 TO 48 HOURS AS 
IT GRADUALLY DECAYS BELOW 8 FT. MEANWHILE...ANOTHER SET OF NW 
SWELL WILL MOVE INTO THE AREA FROM THE N CENTRAL PACIFIC 
ACCOMPANYING A COLD FRONT REACHING AS FAR AS 30N130W TO 27N140W 
BY LATE FRI. AN UPPER LOW CENTERED OVER 20N145W IS SUPPORTING 
PERSISTENT CONVECTION ALONG THE MONSOON TROUGH W OF 120W. 

$$
CHRISTENSEN