000
AXPZ20 KNHC 250352
TWDEP 

TROPICAL WEATHER DISCUSSION   
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC MON APR 25 2011

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

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0345 UTC.

...ITCZ...
AXIS FROM 04N77W TO 05N95W TO 10N104W TO 05N124W TO 04N140W.  
SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 120 NM OF 
AXIS FROM 96W TO 108W.  SCATTERED MODERATE CONVECTION WITHIN 240 
NM OF AXIS FROM 112W TO 122W.  ISOLATED MODERATE CONVECTION 
WITHIN 90 NM OF W OF 125W. 

...DISCUSSION...
UPPER LEVEL TROUGH EXTENDS FROM 32N108W TO 17N140W.  STRONG MASS 
CONVERGENCE PROMPTS MODERATE TO STRONG SUBSIDENCE NW OF TROUGH.  
WELL ANCHORED ANTICYCLONE ALOFT AT 13N102W EFFECTIVELY BLOCKS 
TROUGH FROM FURTHER SOUTHWARD INTRUSION...FORCING IT NE BUT 
SQUEEZING BROAD SURFACE RIDGE AGAINST CALIFORNIA COAST. 
ANTICYCLONE MAINTAINS DIFFLUENT FLOW ALOFT NEAR BASE OF SURFACE 
TROUGH ENHANCING CONVECTION IN ITS VICINITY.  FAIRLY DRY AND 
STABLE AIR MASS E OF ANTICYCLONE.

AT THE SURFACE...
HIGH PRES CENTER 1025 MB AT 29N137W DRIFT E-NE SQUEEZES GRADIENT 
AGAINST CALIFORNIA COAST INCREASING N-NW WINDS TO GALE FORCE 
WITHIN 48 HRS.  NEAR GALE FORCE WIND AND SEAS CONTINUE SPREADING 
S ALONG BAJA CALIFORNIA W COAST TO 23N.  SEAS 8-9 FT BUILD TO 11 
FT BY TUE. 
  
FRESH NE BREEZE FROM 10N TO 18N W OF 135W WEAKEN AS HIGH PRES 
DRIFT EASTWARD. 

$$
WALLY BARNES