000
AXPZ20 KNHC 061553
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC TUE APR 06 2010

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

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...ITCZ...

AXIS IS CENTERED ALONG 04N77W TO 02N105W TO 01N116W TO 02N125W 
TO 04N140W. NUMEROUS MODERATE SCATTERED STRONG CONVECTION WITHIN 
210 NM EITHER SIDE OF AXIS E OF 82W. SCATTERED MODERATE ISOLATED 
STRONG CONVECTION WITHIN 150 NM N OF THE AXIS AND 90 NM S OF 
AXIS BETWEEN 93W AND 108W. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION WITHIN 400 NM N OF AXIS BETWEEN 113W AND 126W. 
SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 150 NM 
EITHER SIDE OF AXIS W OF 130W. 

...DISCUSSION...

A BROAD UPPER TROUGH COVERS THE AREA N OF 26N E OF 250W TO 
INLAND THE WESTERN UNITED STATES. JUST WEST OF THE TROUGH IS A 
SHORTWAVE RIDGE BETWEEN 125W AND 135W THAT LIES AHEAD OF ANOTHER 
STRONGLY NEGATIVELY TILTED TROUGH JUST ENTERING THE AREA NEAR 
140W. IN THE DEEP TROPICS...ACTIVE CONVECTION ALONG THE ITCZ IS 
MAINTAINING UPPER LEVEL RIDGING ALONG 08N.

SURFACE HIGH PRESSURE 1031 MB IS CENTERED NEAR 34.5N141.5W. THE 
PRESSURE GRADIENT BETWEEN THIS SURFACE HIGH PRESSURE AND THE 
ITCZ IS MAINTAINING A LARGE AREA OF FRESH TO STRONG TRADES FROM 
06N TO 23N W OF 120W. A TIGHT PRES GRADIENT BETWEEN THE 
AFOREMENTIONED HIGH PRESSURE AND TROUGHING OVER THE SIERRA MADRE 
OCCIDENTAL IS RESULTING IN NW WINDS OF 20-25 KT N OF 23N E OF 
120W...AND BEGINNING TO INCREASE TO THESE VALUES OVER THE GULF 
OF CALIFORNIA N OF 26N. 

MAJORITY OF WAVEWATCH MODEL GUIDANCE INDICATES THAT A RATHER 
LARGE NW SWELL TRAIN WILL PROPAGATE INTO THE NE PART OF THE AREA 
BEGINNING TODAY GENERATING COMBINED SEAS OF UP TO 15 FT NEAR 30N 
E OF 130W BY THIS AFTERNOON AND INTO TONIGHT. SWELLS WILL THEN 
BEGIN TO SLOWLY SUBSIDE THROUGH WED.

FOR ADDITIONAL INFORMATION PLEASE VISIT 
HTTP://WWW.HURRICANES.GOV/MARINE

$$

AL