000
AXPZ20 KNHC 111557
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC SUN APR 11 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 
0900 UTC.

...ITCZ...

AXIS ALONG 06N77W TO 06N106W TO 09N118W TO 04N140W. SCATTERED 
MODERATE ISOLATED STRONG CONVECTION WITHIN 60 NM EITHER SIDE OF 
A LINE FROM 07N78W TO 07N83W TO 03N105W AND ALSO FROM 04N TO 12N 
BETWEEN 106W AND 115W.

...DISCUSSION...

A DEEP LAYERED CYCLONE IS CENTERED N OF AREA AT 38N128W WITH AN 
NEGATIVE TILT UPPER TROUGH EXTENDING SE TO 28N118W. A BAND OF 
DRY UPPER AIR IS ROTATING THROUGH THE TROUGH ALONG 28N140W TO 
30N115W. AN UPPER ANTICYCLONE IS CENTERED NEAR 13N111W WITH A 
RIDGE W TO BEYOND 10N140W...AND A RIDGE EXTENDING NE TO 
20N105W.  UPPER DIFFLUENCE IS ENHANCING CONVECTION ALONG THE 
ITCZ BETWEEN 105W AND 115W. THE RESULTANT DEBRIS MOISTURE IS 
FANNING OUT OVER THE DISCUSSION AREA S OF 20N BETWEEN 110W AND 
135W...WITH SOME MOISTURE CONTINUING NE ALONG THE PREVIOUSLY 
MENTIONED UPPER RIDGE EVAPORATING OVER OLD MEXICO ALONG 20N. A 
THIN LINE OF DEBRIS MOISTURE...ORIGINATING FROM ITCZ CONVECTION 
W OF AREA BETWEEN 142W AND 157W...IS STREAMING NE ALONG THE 
PERIPHERY OF THE RIDGE...ROUGHLY WITH 60 NM OF LINE 22N140W TO 
28N110W.   

AN UPPER SHORTWAVE TROUGH EXTENDS S ACROSS THE GULF OF MEXICO 
AND OLD MEXICO TO OVER THE E PAC TO A BASE AT 14N96W. AN UPPER 
RIDGE EXTENDS W OVER THE COAST OF S AMERICA TO A SHARP CREST AT 
10N92W. CONVECTION ALONG THE ITCZ BETWEEN W COLOMBIA AND 102W IS 
SLIGHTLY ENHANCED...BUT DEBRIS MOISTURE QUICKLY EVAPORATES IN 
THE DRY UPPER AIR DOMINATING THE DISCUSSION AREA S OF 18N E 
OF 107W. 

AT THE SURFACE...HIGH PRES 1022 MB IS CENTERED AT 26N117W AND IS 
EXPECTED TO DISSIPATE ALLOWING A COLD FRONT CURRENTLY EXTENDING 
FROM 32N128W TO 27N140W TO CONTINUE E REACHING THE NORTHERN BAJA 
PENINSULA MON NIGHT BEFORE LOSING IDENTITY.  A RIDGE WILL 
BUILD SE ACROSS THE AREA IN THE WAKE OF THE FRONT. NE TRADES 
AT 15 TO 20 KT GENERALLY COVER THE AREA S OF 18N W OF 110W. 
ASSOCIATED NE SWELL IS MIXING WITH SW SWELL THAT HAS BEEN 
PROPAGATING NE OVER THE AREA E OF 130W...AND NOTED AS FAR N AS 
SOUTHERN CALIFORNIA. 

GAP WINDS...
GULF 0F TEHUANTEPEC...NORTHERLY 15 TO 20 KT WINDS ARE EXPECTED 
TO CONTINUE OVER THE WATERS N OF 13N BETWEEN 93W AND 96W FOR 
NEXT FEW DAYS WITH THE RESULTANT N WIND WAVE MIXING WITH SW 
SWELL.

GULF OF PAPAGAYO...PERSISTENT NE TRADES TRADES OVER THE W  
CARIBBEAN SEA WILL CONTINUE TO FUNNEL THROUGH THE GULF OF 
PAPAGAYO AT 20 KT WINDS FOR A COUPLE OF DAYS. THE RESULTANT 
SHORT PERIOD NE SWELL WILL MIX WITH LONG PERIOD SW SWELL.   
  
GULF OF PANAMA...N WINDS AT 15 TO 20 KT ARE NOTED OVER THE 
WATERS  OF 06N BETWEEN 78W AND 81W...BUT ARE EXPECTED TO 
DIMINISH TONIGHT.   

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

$$
NELSON