000
AXPZ20 KNHC 250921
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SAT APR 25 2009

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0845 UTC.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE IS ALONG THE LINE...04N77W TO 
04N100W TO 05N115W TO 09N140W. SCATTERED MODERATE TO STRONG 
CONVECTION FROM 04.5N TO 06N BETWEEN 107W AND 115W.

...DISCUSSION...

UPPER LEVELS...
SHORTWAVE IS MOVING EAST ACROSS SOUTHERN MEXICO AND WILL BE EAST 
OF MEXICO SUNDAY NIGHT. THIS FEATURE IS PRODUCING SOUTHWESTERLY 
FLOW EAST OF THE SYSTEM OVER EASTERN MEXICO AND CENTRAL AMERICA 
WEST OF PANAMA. THIS FLOW IS MOIST AND INCLUDES BROKEN TO 
OVERCAST MULTI LEVEL CLOUDS WITH SOME ISOLATED CONVECTION OVER 
CENTRAL AMERICA.

A STRONG LARGE TROUGH IS WEST OF THE AREA AND ASSOCIATED MOIST 
SOUTHERLY FLOW IS OVER THE AREA WEST OF 120W. THIS AREA INCLUDES 
MULTI LEVEL CLOUDS MAINLY NORTH OF 16N WEST OF 115W. 

MOST OF THE AREA IS UNDER BROAD ANTICYCLONIC FLOW WITH THE HIGH 
CENTER NEAR 15N117W. THIS FEATURE IS EXPECTED TO PERSIST THROUGH 
AT LEAST 48 HOURS.

SURFACE...
COLD FRONT IS ALONG 30N EAST OF 127W AND IS FORECAST TO MOVE 
SOUTH AS A RIDGE BUILDS OVER THE AREA NORTH OF THE FRONT WITH 
INCREASING NORTHWESTERLY WINDS ALONG AND JUST WEST OF BAJA 
CALIFORNIA. 

WEAK RIDGE IS NORTH OF 10N WEST OF 100W. ELSEWHERE BROAD TROUGH 
IS ANALYZED.

GAP NORTHEAST TO EAST WINDS OF 20 TO 25 KNOTS IN THE GULF OF 
PAPAGAYO REGION WILL CONTINUE THROUGH THE NEXT COUPLE OF DAYS 
BEFORE DIMINISHING SLOWLY EARLY NEXT WEEK.

$$
LL