000
AXPZ20 KNHC 310902
TWDEP 

TROPICAL WEATHER DISCUSSION      
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC TUE MAR 31 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 0900 UTC.

...ITCZ...
AXIS IS ALONG 6N83W 1N93W 6N140W. SCATTERED MODERATE TO STRONG 
CONVECTION WITHIN 100 NM S OF AXIS FROM 85W-89N.

...DISCUSSION...
DEEP LAYER TROUGH EXTEND FROM THE WRN U.S. INTO THE AREA NEAR 
32N118W TO 26N140W. A 95-105 KT JET STREAM IS SE OF THE TROUGH 
FROM 22N140W TO 24N130W WHERE WINDS INCREASE 110-120 KT THEN 
CONTINUES ACROSS CENTRAL BAJA CALIFORNIA INTO NORTHERN MEXICO. 
BROKEN TO OVERCAST CIRRUS CLOUDS ARE WITHIN 450 NM S OF THE JET 
AXIS. TRANSVERSE BANDING IS INDICATED IN THE CIRRUS CLOUDS W OF 
135W INDICATING POSSIBLE UPPER LEVEL TURBULENCE.

S OF THE TROUGH A BROAD UPPER LEVEL ANTICYCLONIC FLOW COVERS THE 
AREA S OF 20N BETWEEN 90W-122W...WITH THE CENTER NEAR 10N109W. 
A FLAT RIDGE EXTENDS NORTHWARD INTO MEXICO...BUT THE FLOW IS 
MOSTLY ZONAL ACROSS MEXICO. MODERATE TO STRONG SUBSIDENCE IS 
MAINTAINING RATHER DRY STABLE CONDITIONS S OF 15N E OF 120W WITH 
ONLY SCATTERED SHOWERS S OF THE ITCZ BETWEEN 86W-95W. THE TAIL 
END OF A MID/UPPER LEVEL TROUGH OVER THE FAR WRN CARIBBEAN 
STRETCHES S TO COSTA RICA.

TO THE W OF THE ANTICYCLONIC FLOW AREA A RATHER SHARP MID/UPPER 
LEVEL TROUGH EXTENDS FROM 13N126W TO THE EQUATOR AT 128W.

SURFACE RIDGE WITH AXIS FROM 32N137W TO 12N104W. BROKEN TO 
OVERCAST STRATOCUMULUS CLOUDS ARE WITHIN THE RIDGE N OF 20N W OF 
120W.

$$
DGS