000
AXPZ20 KNHC 090930
TWDEP 

TROPICAL WEATHER DISCUSSION      
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC WED MAY 09 2012

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 1011 MB LOW PRES NEAR 9N88W TO 8N103W. ITCZ 
FROM 8N103W 7N125W 4N140W. SCATTERED MODERATE TO STRONG 
CONVECTION WITHIN 180 NM S OF AXIS FROM 103W-114W AND WITHIN 240 
NM N OF AXIS FROM 110W-114W AND WITHIN 90 NM N OF AXIS FROM 
127W-135W.

...DISCUSSION...
AN UPPER LEVEL RIDGE IS ACROSS THE NW PORTION OF THE DISCUSSION 
AREA N OF 15N W OF 120W. DOWNSTREAM UPPER LEVEL TROUGH EXTENDS 
FROM A CYCLONIC CIRCULATION OVER NW MEXICO NEAR 32N113W SW 
ACROSS THE CENTRAL BAJA CALIFORNIA PENINSULA TO 25N115W. A 
90-105 KT JETSTREAM IS SE OF THE TROUGH AXIS FROM 22N120W ACROSS 
CENTRAL MEXICO INTO S TEXAS. EXCEPT FROM A FEW HIGH CLOUDS FROM 
20N-30N W OF 132W STRONG SUBSIDENCE WITH DRY/STABLE AIR AT THE 
MIDDLE AND UPPER LEVELS IS N OF 20N W OF 115W. OTHERWISE BROAD 
UPPER RIDGE DOMINATES THE REMAINDER OF THE DISCUSSION AREA. 
UPPER LEVEL DIFFLUENT FLOW WITHIN THE RIDGE IS ENHANCING 
CONVECTIVE ACTIVITY FROM 5N-13N BETWEEN 104W-114W,

SURFACE HIGH PRES RIDGE N OF 15N W OF 120W. THE PRES GRADIENT 
BETWEEN THE RIDGE AND LOWER PRES ALONG CALIFORNIA AND THE 
NORTHERN BAJA CALIFORNIA PENINSULA IS RESULTING IN AN AREA OF 20 
KT NLY WINDS N OF AROUND 25N W OF 130W. THIS WEATHER PATTERN AND 
CONDITIONS WILL PERSIST THROUGH LATE THU WITH INCREASING NLY ON 
THU. THE PRES GRADIENT ALONG THE SOUTHERN PERIPHERY OF THE RIDGE 
HAS DECREASED AND THE TRADES HAVE DECREASED TO LESS THAN 20 KT.

$$
DGS