000
AXPZ20 KNHC 210911
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC FRI MAR 21 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 IS CENTERED ALONG 3N78W 3N105W 6N115W 4N140W. 
SCATTERED MODERATE ISOLATED STRONG WITHIN 180 NM N OF AXIS FROM 
112W TO 125W.

...DISCUSSION...
MID/UPPER LEVEL TROUGH OVER THE FAR NW CORNER OF THE AREA FROM
32N138W TO 20N140W. MID/UPPER LEVEL MOISTURE IS STREAMING ENE 
AHEAD OF THE TROUGH ALONG A 80-95 KT SUBTROPICAL JETSTREAM FROM 
10N-21N BETWEEN 125W-135W. A BROAD MID/UPPER LEVEL RIDGE IS E OF 
THE TROUGH BETWEEN 105W AND 130W WITH AN UPPER LEVEL 
ANTICYCLONIC CIRCULATION CENTERED NEAR 12N114W. THE UPPER LEVEL 
FLOW BECOMES DIFFLUENT S OF ANTICYCLONIC CIRCULATION ENHANCING 
ITCZ CONVECTION BETWEEN 110W-125W.

DEEP LAYER TROUGH EXTENDS SW FROM THE WRN GULF OF MEXICO THROUGH 
CENTRAL MEXICO AND TO NEAR 14N100W WITH AN UPPER LEVEL TROUGH 
FROM 14N100W TO EQUATOR AT 102W. CONFLUENT FLOW INTO THE BACK 
SIDE OF THIS TROUGH IS RESULTING IN MODERATE TO STRONG 
SUBSIDENCE N OF 15N E OF 120W WHERE SKIES ARE NOTED AS MOSTLY 
CLEAR OVER LAND WITH ONLY SCATTERED/BROKEN STRATOCUMULUS CLOUDS 
OVER THE PACIFIC. MID/UPPER LEVEL RIDGING EXTENDS FROM NW 
COLOMBIA NW ACROSS CENTRAL AMERICA THEN N INTO THE WESTERN 
CARIBBEAN.

RIDGE ENTERS THE REGION AT 32N132W TO 19N107W. HIGH PRES 
COVERS THE AREA N OF 15N W OF 105W. TIGHT PRES GRADIENT 
CONTINUES OVER SE MEXICO RESULTING IN GALE FORCE WINDS IN THE 
GULF OF TEHUANTEPEC.

$$
DGS