000
AXPZ20 KNHC 202106
TWDEP 

TROPICAL WEATHER DISCUSSION   
NWS NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC SUN MAR 20 2011

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W.

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE IS CENTERED ALONG 08N84W TO 
04N100W TO 07N140W. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION WITHIN 120 NM N AND 60 NM S OF AXIS BETWEEN 90W AND 
94W.

...DISCUSSION...

SURFACE COLD FRONT EXTENDS FROM 30N122W TO 26N140W. GALE FORCE 
WINDS N OF 26N WITHIN 150 NM E OF THE FRONT WILL DIMINISH BELOW 
GALE FORCE THIS EVENING. BY EARLY TUE...THE FRONT WILL BE 
DISSIPATING INLAND THE WESTERN U.S. A NEW COLD FRONT WILL MOVE 
INTO THE FAR NW PORTION OF THE AREA TUE AFTERNOON...EXTENDING 
FROM 30N133W TO 29N140W. THIS FRONT WILL USHER IN ANOTHER SET OF 
LONG PERIOD NW SWELLS INTO THE NW PORTION OF THE AREA. 

A RIDGE OF HIGH PRES EXTENDS ACROSS THE AREA FROM 22N140W TO 
21N110W. THE PRESSURE GRADIENT BETWEEN THE RIDGE AND LOWER 
PRESSURE NEAR THE ITCZ IS MAINTAINING FRESH 20 KT TRADES FROM 
07N TO 15N W OF 132W. WITH A WEAK RIDGE PREVAILING THROUGH THE 
NEXT 48 HOURS...THE FRESH TRADES WILL PREVAIL IN THIS GENERAL 
AREA THROUGH THE NEXT 48 HOURS. 

FARTHER SE...A 1009 MB SURFACE LOW ALONG THE COAST OF COLOMBIA 
NEAR 04N78W IS EXPECTED TO REMAIN STATIONARY OVER THE NEXT 48 
HOURS. 

GAP WINDS...
GULF OF CALIFORNIA...SW WINDS HAVE INCREASED ABOVE 20 KT AHEAD 
OF THE COLD FRONT MENTIONED ABOVE. THE FRONT WILL MOVE INTO THE 
AREA LATE MON NIGHT THEN WILL QUICKLY DISSIPATE...WITH WINDS 
THEN DIMINISHING BELOW 20 KT.

GULF OF TEHUANTEPEC...FRESH TO STRONG N TO NE WINDS ARE EXPECTED 
TO CONTINUE THROUGH TUE MORNING BEFORE DIMINISHING BY TUE 
AFTERNOON. WINDS WILL REACH NEAR GALE IN THE EARLY MORNING HOURS 
MON AND TUE WITH THE AID OF NOCTURNAL DRAINAGE FLOW.

FRESH TO STRONG WINDS ARE FUNNELING THROUGH THE CENTRAL AMERICA 
PASSES INTO THE GULFS OF PAPAGAYO AND PANAMA. WINDS ARE EXPECTED 
TO REMAIN ABOVE 20 KT THROUGH THE FORECAST PERIOD. 

$$
AL