000
AXPZ20 KNHC 240235
TWDEP 

TROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
0405 UTC FRI APR 24 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0230 UTC. 
 
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...              

THE ITCZ AXIS EXTENDS FROM 06N95W TO 08N114W TO 07N119W THEN 
RESUMES FROM 06N123W TO 04N140W. NO SIGNIFICANT CONVECTION IS 
NOTED.

...DISCUSSION... 

A MIDDLE LEVEL TO UPPER LEVEL TROUGH PASSES THROUGH 32N116W TO 
21N122W TO 13N127W. UPPER LEVEL SOUTHWEST WIND FLOW IS WITHIN 
480 NM TO 600 NM TO THE EAST AND SOUTHEAST OF THE TROUGH WHICH 
IS TRANSPORTING DEEP TROPICAL MOISTURE TO THE NORTHEAST. THE 
SOUTHWEST WIND FLOW IS MOVING FROM 11N120W BEYOND 25N108W INTO 
MEXICO. BROAD MIDDLE LEVEL TO UPPER LEVEL ANTICYCLONIC WIND FLOW 
COVERS THE AREA TO THE EAST OF THE SOUTHWEST WIND FLOW...FROM 
MEXICO AND CENTRAL AMERICA TO THE ITCZ.

A SURFACE RIDGE EXTENDS FROM A 1030 MB HIGH PRESSURE CENTER  
THAT IS NEAR 35N145W THROUGH 32N137W TO 17N105W. THE PRESSURE 
GRADIENT SW OF THE RIDGE AND N OF THE LOWER PRESSURES ASSOCIATED 
WITH THE ITCZ IS TIGHT ENOUGH TO SUPPORT FRESH TO STRONG NE 
TRADES ACROSS THE W CENTRAL WATERS. COMBINED SEAS ARE 8-11 FT IN 
MIXED NE WIND WAVES AND LONG PERIOD SW AND NW SWELLS. THESE 
CONDITIONS ARE FORECAST TO PERSIST ACROSS THE W CENTRAL WATERS 
THROUGH THE NEXT 48 HOURS.

GALE FORCE NORTHERLY WINDS ARE BLOWING IN THE WATERS THAT ARE 
OFF THE NORTHERN CALIFORNIA REDWOOD COAST. THESE WINDS ARE 
GENERATING NORTHERLY SWELL WITH SEA HEIGHTS THAT RANGE FROM 8-11 
FT THAT ARE PROPAGATING SOUTHWARD INTO THE NORTH CENTRAL PART OF 
THE DISCUSSION AREA. THESE SEAS WILL PERSIST THROUGH EARLY FRI 
GRADUALLY SUBSIDING TO LESS THAN 8 FT BY SAT AFTERNOON AS THE 
GALE FORCE WIND EVENT THAT IS TAKING PLACE ENDS.

GULF OF CALIFORNIA...A SURFACE TROUGH EXTENDS FROM SOUTHWEST 
ARIZONA INTO THE FAR NORTHWEST SECTION OF THE GULF OF 
CALIFORNIA. THE SURFACE PRESSURE GRADIENT THAT SURROUNDS THIS 
TROUGH WILL STRENGTHEN THIS EVENING GIVING SOUTH-TO-SOUTHWEST 
WIND SPEEDS OF 20-25 KT ON THE EASTERN SIDE OF THE TROUGH. 
PULSES OF THESE STRONGER WIND SPEEDS WILL PULSE FROM THE 
MIDNIGHT/EARLY MORNING HOURS UNTIL THE MIDDAY HOURS FOR TONIGHT 
AND AGAIN FRI NIGHT. THE SEA HEIGHTS WILL BE LOWER THAN 8 FEET 
DURING THE NEXT 48 HOURS.

GULF OF PAPAGAYO...GAP WIND FLOW WILL PULSE TO FRESH TO STRONG 
LEVELS LATE TONIGHT INTO EARLY FRI WITH THE ASSISTANCE OF 
NOCTURNAL DRAINAGE FLOW.

$$ 
LEWITSKY