000
AXPZ20 KNHC 152126
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC THU APR 15 2010

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...

AXIS ALONG 04N77W TO 07N93W TO 05N104W TO 07.5N116W TO 08N132W 
TO 05W140W. SCATTERED MODERATE CONVECTION WITHIN 180 NM N OF 83W 
TO 87W. SCATTERED MODERATE TO STRONG CONVECTION WITHIN 45 NM N 
OF AXIS AND 120 NM S OF AXIS BETWEEN 91W AND 95W. SCATTERED 
MODERATE ISOLATED STRONG CONVECTION WITHIN 90 NM S OF AXIS 
BETWEEN 105W AND 123W. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION WITHIN 90 NM N OF AXIS AND 120 NM S OF AXIS BETWEEN 
123W AND 133W. 

...DISCUSSION...

AN UPPER LEVEL CYCLONE IS POSITIONED N OF THE AREA NEAR 44N137W 
WITH AN UPPER TROUGH EXTENDING FROM THE CYCLONE TO 30N140W. 
ANOTHER LARGER 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 06N91W. 

TO THE S...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...THE ABOVE MENTIONED UPPER LEVEL CYCLONE AND 
TROUGH ARE SUPPORTING A SURFACE LOW PRES CENTER OF 1000 MB NEAR 
35N135W WITH A COLD FRONT EXTENDING FROM THE LOW CENTER TO 
30N133W TO 24N140W. S-SW WINDS OF 20 TO 30 KT PREVAIL N OF 25N 
WITHIN 210 NM E OF THE FRONT. 

THE PRESSURE GRADIENT BETWEEN THE ITCZ AND HIGH PRESSURE 1020 MB 
POSITIONED NEAR 26N124W 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.

$$
AL/FORMOSA