000
AXPZ20 KNHC 200329
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC THU MAY 20 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 
0245 UTC.

...TROPICAL WAVES...
TROPICAL WAVE ALONG 82W N OF 02N MOVING W AT 10 KT. SCATTERED 
MODERATE TO STRONG CONVECTION IS WITHIN 120 NM E OF WAVE N OF 
05N.

TROPICAL WAVE FROM 04N101W TO 12N100W MOVING W AT 15 KT. 
SCATTERED MODERATE CONVECTION IS WITHIN 150 NM E OF WAVE FROM 
10N TO 12N.

...ITCZ...
AXIS ALONG 08N81W TO 09N100W TO 06.5N113W TO 08N125W TO 05N140W. 
SCATTERED MODERATE ISOLATED STRONG WITHIN 120 NM S OF AXIS 
BETWEEN 84W AND 91W. 

...DISCUSSION...
IN THE UPPER LEVELS...A SERIES OF SHORT WAVE TROUGHS AND RIDGES 
PREVAILS N OF 20N. ANTICYCLONE CENTERED NEAR 14.5N95W IS 
ADVECTING TROPICAL MOISTURE...MOSTLY ITCZ CONVECTIVE 
DEBRIS...INTO SOUTHERN MEXICO AND THE WESTERN CARIBBEAN. RIDGE 
EXTENDS FROM THIS ANTICYCLONE ACROSS CENTRAL AMERICA...AND ALONG 
10N AS FAR W AS 140W. 

ELSEWHERE AT THE SURFACE...
HIGH PRESSURE 1031 MB CENTERED NEAR 36N149W. THE PRESSURE 
GRADIENT BETWEEN THIS FEATURE AND THE ITCZ IS MAINTAINING FRESH 
TRADES FROM 06N TO 16N W OF 125W . A TIGHT PRESSURE GRADIENT IS 
ALSO PRESENT BETWEEN THE HIGH PRESSURE AND A TROUGH OVER MEXICO 
AND IS PRODUCING FRESH TO STRONG NW TO N WINDS WITHIN 180 NM OFF 
THE W COAST OF BAJA CALIFORNIA.

CROSS-EQUATORIAL LONG PERIOD SW SWELL WILL REACH MUCH OF THE E 
PAC E OF 120W AND COASTLINE WITH HEIGHTS IN THE 8-12 FT RANGE BY 
FRI. 

$$
AL