000
AXPZ20 KNHC 201500
TWDEP 

TROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
1605 UTC MON APR 20 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC. 
 
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...              

MONSOON TROUGH FROM 1009 MB LOW PRES NEAR 6N99W TO 6N105W. ITCZ 
FROM 6N105W TO 5N130W TO 4N140W. SCATTERED MODERATE TO STRONG 
CONVECTION 7N-10N W OF 130W. 

...DISCUSSION... 

A BROAD UPPER LEVEL TROUGH EXTENDS FROM A CYCLONIC CIRCULATION 
JUST N OF THE AREA NEAR 33N124W TO 20N127W. A 95-115 KT 
JETSTREAM IS SE OF THE TROUGH EXTENDS FROM 19N123W TO CENTRAL 
BAJA CALIFORNIA. STRONG SUBSIDENCE WITH DRY AND STABLE AIR AT 
THE MIDDLE AND UPPER LEVELS IS NW OF A LINE 15N140W TO 30N115W. 
SW WINDS E OF THE TROUGH IS ADVECTING MIDDLE AND UPPER LEVEL 
MOISTURE INTO SOUTHERN BAJA CALIFORNIA INTO NORTHERN MEXICO. AN 
UPPER LEVEL ANTICYCLONIC CIRCULATION IS CENTERED NEAR 12N107W 
WITH A RIDGE NE ANOTHER ANTICYCLONIC CIRCULATION NEAR 15N100W 
THEN INTO SOUTHERN MEXICO. 

A SURFACE RIDGE IS ACROSS THE AREA N OF 15N W OF 113W. THE PRES 
GRADIENT BETWEEN THE RIDGE AND THE ITCZ IS PRODUCING ELY TRADES 
15-20 KT WITH SEAS 8-9 FT FROM 9N-16N W OF 130W. AN AREA OF NLY 
WINDS TO 20 KT WITH SEAS 8 FT IN NW SWELL WILL DEVELOP N OF 26N 
W OF 136W TUE...THIS AREAS WILL SPREAD EASTWARD ON WED.

$$
DGS