000
AXPZ20 KNHC 310413
TWDEP 

TROPICAL WEATHER DISCUSSION      
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC TUE MAR 31 2009

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 0300 UTC.

...ITCZ...
AXIS IS ALONG 7N82W 3N93W 2N105W 2N120W 4N130W 6N140W. 
SCATTERED MODERATE FROM 08N TO 10N W OF 137W.

...DISCUSSION...
DEEP LAYER TROUGH EXTEND FROM THE WRN U.S. INTO THE AREA NEAR 
32N122W TO 26N140W. A 100-105 KT JET STREAM IS SE OF THE TROUGH 
FROM 22N140W TO 26N125W WHERE WINDS INCREASE 110-120 KT 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 93W-120W...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 AND PANAMA.

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