000
AXPZ20 KNHC 181507
TWDEP 

TROPICAL WEATHER DISCUSSION   
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC TUE APR 18 2006

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS 
BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...ITCZ...
ITCZ AXIS IS CENTERED ALONG 6N78W 8N95W 4N1120W 3N140W. 
SCATTERED MODERATE TO STRONG WITHIN 60 NM EITHER SIDE OF THE 
AXIS E OF 90W AND FROM 98W TO 114W. SCATTERED MODERATE ISOLATED 
STRONG WITHIN 100 NM N OF AXIS FROM 119W TO 122W.

...DISCUSSION...
BROAD RIDGE OVER THE WESTERN PORTION OF THE AREA W OF 130W...
WITH A UPPER LEVEL ANTICYCLONIC CIRCULATION NEAR 8N132W. A 70 KT 
JET STREAM EXTENDS THROUGH THE RIDGE FROM 20N140W TO 19N132W TO 
15N125W. BROAD AND WEAKENING MID/UPPER LEVEL TROUGH IS OVER THE 
NE PORTION OF THE AREA N OF 21N BETWEEN 110W AND 127W. AN 
EMBEDDED SHORTWAVE TROUGH EXTENDS FROM CYCLONIC CIRCULATION NEAR 
32N125W TO 29N127W. DRY AIR AND ASSOCIATED MODERATE TO STRONG 
SUBSIDENCE IS NOTED NORTH OF 11N BETWEEN 110W AND 135W. 
MID/UPPER LEVEL RIDGE WITH AXIS FROM CENTRAL AMERICA ACROSS 
EASTERN MEXICO THEN INTO TEXAS. EXCEPT FOR SOME HIGH LEVEL 
MOISTURE OVER NORTHERN MEXICO STRONG SUBSIDENCE AND DRY AIR IS 
NOTED N OF THE ITCZ E OF 110W.

SURFACE HIGH PRES RIDGE COVERS THE AREA N OF 13N W OF 110W. 
BROKEN TO OVERCAST STRATUS AND STRATOCUMULUS CLOUDS IS WITHIN 
THE RIDGE. SURFACE TROUGH IS ALONG THE COAST OF MEXICO FROM 
PUERTO VALLARTA TO AROUND 90 NM OFF THE COAST OF ACAPULCO. NO 
SIGNIFICANT WEATHER ASSOCIATED WITH THIS TROUGH. ANOTHER TROUGH 
IS ANALYZED ALONG THE ITCZ FROM 9N123W TO 3N124W. SCATTERED 
SHOWERS AND TSTMS ARE E OF THE TROUGH FROM 5N TO 8N BETWEEN 119W 
AND 123W.
 
$$
DGS