000
AXPZ20 KNHC 050928
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC TUE FEB 05 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 9N84W 5N92W TO 4N100W. ITCZ FROM 04N100W TO 
06N140W. NO SIGNIFICANT CONVECTION.

...DISCUSSION...
UPPER LEVEL TROUGH EXTENDS FROM 32N122W TO CYCLONIC CIRCULATION 
CENTERED NEAR 17N126W TROUGH CONTINUES TO 8N133W. SCATTERED 
SHOWERS ARE FROM 11N-17N E OF THE CYCLONIC CIRCULATION TO 122W.  
AN UPPER LEVEL RIDGE IS BUILDING BEHIND THE OVER THE FAR NW 
PORTION OF THE DISCUSSION AREA. A 95-105 KT JETSTREAM OVER THE 
TOP OF THE RIDGE FROM 32N140W TO 28N128W. MOSTLY WLY ZONAL FLOW 
N OF 12N E OF THE TROUGH. A TROUGH IN THE DEEP TROPICS WITH AXIS 
FROM 13N98W TO THE GALAPAGOS ISLAND. STRONG SUBSIDENCE WITH DRY 
AND STABLE AT THE MIDDLE AND UPPER LEVELS IS ACROSS THE AREA S 
OF 15N E OF 120W. THE SUBSIDENCE HAS SUPPRESSED CONVECTION ALONG 
THE ITCZ AND MONSOON TROUGH.

SURFACE TROUGH FROM 22N139N TO 12N139W WILL MOVE W OF THE AREA 
LATER TODAY. THE PRES GRADIENT HAS RELAXED AND ELY TRADES HAVE 
DECREASED TO 20 KT OR LESS...HOWEVER NW SWELLS TO 10 FT WILL 
CONTINUE N OF 10N W OF 115W. THE HIGH TO THE N STRENGTHENS WED 
NIGHT AND ELY WINDS INCREASE TO 20-25 KT FROM 10N-20N W OF 130W.

$$
DGS