000
AXPZ20 KNHC 222154
TWDEP 

TROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
2205 UTC WED APR 22 2015

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 
2100 UTC. 
 
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...              

THE ITCZ AXIS EXTENDS FROM 08N93W TO 03N103W TO 07N117W THEN  
RESUMES FROM 06N122W TO 07N130W TO 05N140W. SCATTERED MODERATE 
AND ISOLATED STRONG CONVECTION IS FROM 06N TO 10N BETWEEN 128W 
AND 132W...AND FROM 05N TO 08N BETWEEN 133W AND 136W. SCATTERED 
MODERATE CONVECTION IS FROM 02N TO 05N BETWEEN 110W AND 114W.

...DISCUSSION... 

GALE FORCE NORTHERLY WINDS ARE BLOWING OFF OF THE NORTHERN 
CALIFORNIA REDWOOD COAST WHICH ARE GENERATING NORTHERLY SWELL 
WITH SEAS OF 8-10 FT PROPAGATING SOUTHWARD INTO THE NORTH 
CENTRAL DISCUSSION WATERS. THESE SEAS WILL PERSIST THROUGH EARLY 
FRI...THEN WILL GRADUALLY SUBSIDE FRI AFTERNOON AND NIGHT AS THE 
GALE FORCE WIND EVENT N OF THE AREA ENDS.

A SURFACE TROUGH EXTENDS FROM 29N119W TO 23N124W WITH SOME 
SHOWERS POSSIBLE NEAR THE TROUGH AXIS. OTHERWISE ONLY LIGHT TO 
MODERATE WINDS ARE OCCURRING EITHER SIDE OF THE TROUGH AXIS. 

HIGH PRESSURE AT 1035 MB IS LOCATED NW-N OF THE DISCUSSION 
WATERS NEAR 38N141W WITH A RIDGE AXIS EXTENDING SE THROUGH 
32N138W TO 21N120W. THE PRESSURE GRADIENT SW OF THE RIDGING AND 
N OF THE ITCZ WHERE LOWER PRESSURES ARE PRESENT IS TIGHT ENOUGH 
TO SUPPORT FRESH TO STRONG TRADES FROM 09N TO 20N W OF 132W AS 
INDICATED BY RECENT ASCAT AND ASCAT-B SCATTEROMETER PASSES. THE 
ASSOCIATED NE WIND WAVES ARE COMMINGLING WITH LONG PERIOD 
NORTHERLY AND CROSS-EQUATORIAL SOUTHERLY SWELL WITH COMBINED 
SEAS OF 8-10 FT ACROSS THE W CENTRAL WATERS. EXPECT THESE 
CONDITIONS TO PERSIST THROUGH THE NEXT 48 HOURS WITH LITTLE 
CHANGE IN THE INTENSITY AND COVERAGE.

E OF 110W...LIGHT TO MODERATE WINDS GENERALLY PREVAIL...WITH 
SEAS OF 4 TO 7 FT IN MIXED SWELL. THE EXCEPTION TO THIS IS ACROSS 
THE GULFS OF PANAMA AND PAPAGAYO...WHERE NOCTURNAL DRAINAGE  
FLOW WAS PRODUCING FRESH N AND NE WINDS RESPECTIVELY. GAP WINDS 
ACROSS THE GULF OF PAPAGAYO ARE EXPECTED TO PULSE TO 20-25 KNOTS 
EACH NIGHT BEGINNING TONIGHT INTO THE EARLY MORNING HOURS EACH 
DAY.

THE GULF OF CALIFORNIA...A SURFACE TROUGH EXTENDS FROM SOUTHERN 
CALIFORNIA S-SE INTO THE N HALF OF THE GULF. THIS TROUGH HAS 
WEAKENED DURING THE PAST FEW HOURS BUT WILL BECOME MORE 
PRONOUNCED TONIGHT ALLOWING FOR S-SW WINDS N OF 29N E OF THE 
TROUGH TO INCREASE TO FRESH TO STRONG LEVELS. SEAS WILL BUILD 
BRIEFLY BETWEEN 5 AND 8 FT JUST TO THE EAST OF THE TROUGH DURING 
THE TIMES OF STRONGEST WINDS.

$$
LEWITSKY