000
AXPZ20 KNHC 180902
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC TUE MAR 18 2008

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...
ITCZ AXIS AXIS 4N78W 7N85W 4N95W 7N115W 6N140W. SCATTERED 
MODERATE 60 NM N OF THE AXIS FROM 115W TO 123W.

...DISCUSSION...
MID/UPPER LEVEL RIDGE COVERS THE WESTERN PORTION OF THE 
DISCUSSION AREA W OF AROUND 120W.  UPPER LEVEL DIFFLUENT FLOW W 
OF THE RIDGE AXIS AND E OF A TROUGH W OF THE AREA WAS NOTED IN 
THE AREA FROM 5N TO 20N W OF 130W WITH THE MOSTLY HIGH LEVEL 
MOISTURE SPREADING N FROM 15N-20N W OF 135W. 

DEEP LAYER MID/UPPER LEVEL TROUGH EXTENDS FROM A WELL DEFINED 
CYCLONIC CIRCULATION CENTER OVER NORTHERN MEXICO NEAR 29N108W S 
TO 20N112W. ASSOCIATED 994 MB SURFACE LOW IS CENTERED NEAR THE 
BIG BEND OF TEXAS S ACROSS EASTERN MEXICO TO 18N93W. AN AREA OF 
VERY STRONG SUBSIDENCE WAS WRAPPING AROUND THE BASE OF THE 
TROUGH AND COVERS THE AREA FROM 18N TO 27N BETWEEN 105W-130W. 
SLY FLOW E OF THE TROUGH AXIS IS ADVECTING TROPICAL MOISTURE NE 
INTO EASTERN MEXICO. AN UPPER ANTICYCLONE OVER THE SRN CARIBBEAN 
EXTENDS WWD ACROSS THE GULF OF HONDURAS AND ACROSS THE TROPICAL 
E PAC TO NEAR 13N100W. STRONG SUBSIDENCE WITHIN THE RIDGE ACROSS 
CENTRAL AMERICA AND INTO THE PACIFIC N OF THE ITCZ E OF 95W.
 
SURFACE RIDGE WITH AXIS FROM 32N135W SE TO 18N105W. 
BROKEN/OVERCAST STRATOCUMULUS CLOUDS ARE FROM 12N-20N W OF 110W 
AND N OF 20N W OF 125W.

$$
DGS