000
AXPZ20 KNHC 210935
TWDEP 

TROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                           
1005 UTC SUN JUL 21 2013

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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...        
MONSOON TROUGH FROM 9N85W TO A 1010 MB LOW PRES 9N104W TO 
13N115W TO 12N125W. ITCZ  FROM 12N125W TO 10N140W. NUMEROUS 
MODERATE TO STRONG CONVECTION N OF 5N E OF 85W. SCATTERED 
MODERATE ISOLATED STRONG CONVECTION WITHIN 180 NM N AND 240 NM S 
OF AXIS FROM 91W-Q00W AND WITHIN 150 NM S OF AXIS FROM 102W-108W.

...DISCUSSION...          
UPPER LEVEL RIDGE OVER THE NW PORTION OF THE DISCUSSION AREA 
EXTENDS FROM AN ANTICYCLONIC CIRCULATION NEAR 16N135W TO 
32N131W. DOWNSTREAM UPPER LEVEL CYCLONIC CIRCULATION IS CENTERED 
NEAR 28N127W. MODERATE TO STRONG SUBSIDENCE WITH DRY/STABLE AIR 
AT THE MIDDLE AND UPPER LEVELS IS N OF 15N W OF 120W. NARROW 
UPPER LEVEL RIDGE SEPARATES THE ABOVE MENTION CYCLONIC 
CIRCULATION FROM ANOTHER CYCLONIC CIRCULATION OFF THE CENTRAL 
BAJA CALIFORNIA COAST NEAR 29N115W. AN UPPER LEVEL ANTICYCLONIC 
CIRCULATION ALONG THE W COAST OF MEXICO NEAR 22N106W. ABUNDANT 
DEEP LEVEL TROPICAL MOISTURE COVERS ALL OF MEXICO AND S INTO 
CENTRAL AMERICA.

SURFACE RIDGE COVERS THE AREA N OF 15N W OF 115W. A SURFACE 
TROUGH EXTENDS FROM 20N112W TO 13N117W. ISOLATED SHOWERS ARE 
ALONG THE TROUGH AXIS.

AN AREA OF NLY SWELL IS N OF 29N BETWEEN 123W-128W IS FORECAST 
TO SUBSIDE TO LESS THAN 8 FT MON NIGHT.

EXPECT INCREASING WINDS TO 20-25 KT AND SEAS TO 8 FT ACROSS THE 
GULF OF PAPAGAYO TONIGHT INTO MON THEN DECREASE MON NIGHT. 

$$ 
DGS