000
AXPZ20 KNHC 090909
TWDEP 

TROPICAL WEATHER DISCUSSION   
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SAT APR 09 2011

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W.

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY 
THROUGH 0900 UTC.

...ITCZ...
AXIS IS ALONG 11N86W TO 4N105W TO 06N120W TO 00N1135W. SCATTERED 
STRONG WITHIN 120 NM N OF AXIS FROM 118W-121W ASSOCIATED WITH 
LOW PRES. 

...DISCUSSION...
UPPER LEVEL RIDGE ACROSS THE W PORTION OF THE DISCUSSION AREA 
FROM 32N137W TO 24N140W. DOWNSTREAM UPPER LEVEL TROUGH WITH AXIS 
FROM A CYCLONIC CIRCULATION CENTERED OVER CENTRAL CALIFORNIA TO 
32N120W TO 17N127W. A 95-105 KT JETSTREAM SE OF THE TROUGH 
EXTENDS FROM 20N121W TO CENTRAL BAJA CALIFORNIA AND INTO NW 
MEXICO WHERE WINDS INCREASE TO 115 KT. MODERATE TO STRONG 
SUBSIDENCE WITH DRY STABLE AIR AT THE MIDDLE AND UPPER LEVELS IS 
FROM 18N TO 25N BETWEEN 120W-135W AND WITHIN 200 NM N OF THE JET 
AXIS TO THE BAJA PENINSULA.

A BROAD E-W UPPER LEVEL RIDGE EXTENDS FROM AND ANTICYCLONIC 
CIRCULATION OVER THE SW CARIBBEAN ACROSS NICARAGUA TO 13N105W. 
MODERATE TO STRONG SUBSIDENCE WITH DRY STABLE AIR AT THE MIDDLE 
AN UPPER LEVELS IS N OF RIDGE AXIS. SCATTERED SHOWERS AND TSTMS 
ARE ON THE S SIDE OF THE RIDGE AXIS.

SURFACE RIDGE COVERS THE AREA N OF 15N W OF 120W...WITH NE 
TRADES TO 20 KT GENERALLY N OF 8N W OF 130W. LARGE NW SWELLS UP 
TO 15 FT ARE N OF 20N W OF 115W. BROKEN/OVERCAST STRATOCUMULUS 
CLOUDS ARE WITHIN THE RIDGE. ELY 20 KT WINDS ARE ALSO BLOWING 
THROUGH GULF OF PAPAGAYO. NW WINDS BETWEEN A TROUGH OVER THE 
WESTERN U.S. AND THE RIDGE ARE TO 20 KT N OF 25N BETWEEN 
120W-30W. A 1010 MB SURFACE IS ANALYZED ALONG THE ITCZ NEAR 
6N120W. SCATTERED STRONG TSTMS ARE WITHIN 120 NM N SEMICIRCLE.

$$
DGS