000
AXPZ20 KNHC 010353
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC THU APR 1 2010

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 
0300 UTC.

...ITCZ...
AXIS ALONG 02N78W TO 06N86W TO 02N111W TO 07N123W TO 03N140W.  
SCATTERED MODERATE WITHIN 45 NM OF AXIS W OF 130W. 

SCATTERED MODERATE CONVECTION WITHIN 90 NM W OF SURFACE TROUGH 
EMBEDDED WITHIN ITCZ FROM 04N127W TO 12N120W. 

...DISCUSSION...
LONG WAVE UPPER LEVEL TROUGH EXTEND FROM CYCLONIC VORTEX AT 
39N125W TO 32N121W TO 16N140W.  HEALTHY JET STREAM 165 KT ROUNDS 
BASE OF VORTEX CAUSING MODERATE TO STRONG SUBSIDENCE...THEREFORE 
DRY STABLE AIR MASS...WITHIN 2 DEG W OF TROUGH AXIS.  SE OF 
TROUGH...ABUNDANT TROPICAL MOISTURE ADVECTED FROM ITCZ 
CONVECTIVE DEBRIS BY 135 KT JET CORE E OF 130W INTO CENTRAL BAJA 
CALIFORNIA PENINSULA AND NW MEXICO THEN INTO SW CONUS.  MOISTURE 
FEED INTO WEAK COLD FRONT ACROSS SOUTHERN CALIFORNIA AND SURFACE 
TROUGH ALONG MEXICO W COAST. 

ELSEWHERE AT THE SURFACE...
STATIONARY 1031 MB HIGH PRES WELL NW OF BASIN HAS BROAD RIDGE 
EXTEND TO 18N108W TIGHTENING PRES GRADIENT ALONG SOUTHERN 
CALIFORNIA COAST AND NORTHERN BAJA CALIFORNIA.  STRONG SW BREEZE 
OVER GULF OF CALIFORNIA VEERS NW AS COLD FRONT MOVES E. 
OTHERWISE...FRESH NE TRADES INDUCED BY RIDGE SQUEEZE AGAINST 
TROUGH ALONG ITCZ.  LONG FETCH ALONG E PERIPHERY OF RIDGE 
PROMOTE LONG PERIOD NW SWELL SPREADING SE THROUGH ENTIRE AREA 
THROUGH PERIOD.

GULF OF PAPAGAYO STRONG E-NE BREEZE EXPECTED TO HAVE DIURNAL/ 
NOCTURNAL PULSING PATTERNS THROUGHOUT NEXT FEW DAYS...AND 
EVENTUALLY BECOME BELOW 20 KT BY LATE FRI.

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

$$
WALLY BARNES