000
AXPZ20 KNHC 252135
TWDEP 

TROPICAL WEATHER DISCUSSION   
NWS NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC FRI MAR 25 2011

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

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE AXIS IS ANALYZED FROM 06N78W 
TO 04N104W. NO DEEP CONVECTION IS PRESENT AT THIS TIME.

...DISCUSSION...

NOT MUCH OF INTEREST IN THE NE PACIFIC REGION THIS AFTERNOON AS 
THERE ARE NO GALES...NO GAP WIND EVENTS...NO ACTIVE COLD 
FRONTS...AND NO DEEP CONVECTION OCCURRING.

SURFACE RIDGING EXTENDING EAST-SOUTHEASTWARD FROM A 1030 MB HIGH 
NEAR 34N158W DOMINATES THE WEATHER OF THE AREA.  A TIGHTENING OF 
THE PRESSURE GRADIENT JUST WEST OF BAJA CALIFORNIA IS 
RESPONSIBLE FOR SOME FRESH TO STRONG NW SURFACE WINDS AS 
CONFIRMED BY SHIPS NWS0009 AND ZCDG7.  THESE WINDS WILL CONTINUE 
BUT WEAKEN SLIGHTLY BY SUNDAY.  ON THE SOUTH SIDE OF THE 
RIDGE...FRESH NE TRADEWINDS ARE OBSERVED BY BOTH THE 1732Z ASCAT 
SCATTEROMETER PASS AND THE 1518Z WINDSAT PASS.  THESE WINDS 
SHOULD CONTINUE THROUGH AT LEAST SUNDAY.  A WEAK TROUGH OF LOW 
PRESSURE LOCATED ALONG 03N107W TO 06N103W SHOWS SOME LOW-LEVEL 
TURNING BUT NO DEEP CONVECTION.  CHANCES ARE SLIM TO NONE FOR 
THIS TO LEAD TOWARD AN OUT OF SEASON TROPICAL CYCLONE. 

THE ENTIRE REGION WEST OF 110W HAS LONG PERIOD LARGE NW SWELL 
WITH PEAK SIGNIFICANT WAVE HEIGHTS UP TO 18 FT NEAR 30N130W.  
WHILE THE NW SWELL WILL CONTINUE THROUGH SUNDAY...THE WAVE 
HEIGHTS WILL SLOWLY DIMINISH WITH PEAK HEIGHTS OF ONLY 12 FT BY 
SUNDAY AFTERNOON.

PERHAPS THE MOST NOTEWORTHY ITEM THIS AFTERNOON IS THE RATHER 
STRONG INTERTROPICAL CONVERGENCE ZONE THAT IS PRESENT SOUTH OF 
THE EQUATOR FROM ABOUT 90W TO 150W ALONG 05S.  THIS IS QUITE 
CONVECTIVELY ACTIVE.  HOWEVER...DUE TO THE VERY STRONG WIND 
SHEAR...FURTHER DEVELOPMENT OF A TROPICAL CYCLONE ALONG THIS 
ITCZ IS VERY UNLIKELY.

$$
LANDSEA