000
AXPZ20 KNHC 160232
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC FRI APR 16 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 
0230 UTC.

...ITCZ...

AXIS ALONG 03.5N77W TO 03.5N81W TO 07.5N94W TO 06N105W TO 
08N117W TO 07W134W TO 04.5N140W. SCATTERED MODERATE ISOLATED 
STRONG CONVECTION WITHIN 150 NM S OF AXIS BETWEEN 91N AND 97N. 
SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 60 NM N AND 
210 NM S OF AXIS BETWEEN 116W AND 133W. 

...DISCUSSION...

AN UPPER LEVEL TROUGH EXTENDS OVER THE EASTERN PORTION OF 
THE AREA FROM THE WESTERN GULF OF MEXICO ACROSS SE OLD MEXICO 
NEAR THE GULF OF TEHUANTEPEC TO NEAR 05N94W. 

UPPER LEVEL ANTICYCLONIC FLOW DOMINATES THE REMAINDER OF THE 
DISCUSSION AREA WITH AN ANTICYCLONE CENTERED NEAR 10N130W. ITCZ 
CONVECTION IS MAINTAINING THIS UPPER LEVEL ANTICYCLONE.

AT THE SURFACE...A COLD FRONT EXTENDS ACROSS THE NW PART OF THE 
AREA FROM 30N131W TO 23N140W. THE PRESSURE GRADIENT BETWEEN THIS 
FRONT AND HIGH PRESSURE MENTIONED IN THE FOLLOWING PARAGRAPH IS 
PRODUCING S-SW WINDS OF 20 TO 25 KT N OF 26N WITHIN 120 NM E OF 
THE FRONT. 

THE PRESSURE GRADIENT BETWEEN THE ITCZ AND HIGH PRESSURE 1019 MB 
POSITIONED NEAR 24N124W IS MAINTAINING NE TRADES OF 20 KT FROM 
08N TO 13N BETWEEN 117W AND 134W. RESULTANT SHORT PERIOD NE WIND 
WAVES ARE COMMINGLING WITH LONG PERIOD NW SWELL AND CROSS 
EQUATORIAL LONG PERIOD SW SWELL THAT HAS BEEN PROPAGATING N 
ACROSS THE DISCUSSION AREA FOR SEVERAL DAYS RESULTING IN 
CONFUSED SEAS WHERE THE DIFFERENT WAVE GROUPS ARE INTERSECTING. 
THE PRESSURE GRADIENT BETWEEN THE AFOREMENTIONED SURFACE HIGH 
PRESSURE AND A TROUGH OVER THE SIERRA MADRE OCCIDENTAL IS 
HELPING PRODUCE W TO NW WINDS OF 20 KT WITHIN 75 NM W OF BAJA 
PENINSULA.

$$
AL