000
AXPZ20 KNHC 181520
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC TUE MAR 18 2008

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. 

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

...ITCZ...
ITCZ AXIS IS ALONG THE LINE...4N77W 8N105W 8N115W 4N1130W 4N140W.
SCATTERED MODERATE WITH ISOLATED STRONG CONVECTION IS WITHIN 90 
NM OF THE POINT 3N82W. SCATTERED MODERATE WITH ISOLATED STRONG 
CONVECTION IS WITHIN 75 NM EITHER SIDE OF THE ITCZ AXIS FROM 
111W TO 126W.

...DISCUSSION...
UPPER LEVELS...
STRONG SHORTWAVE IS OVER MEXICO APPROACHING THE RIO GRANDE 
VALLEY. MULTI LEVEL CLOUDS ARE N OF 27N E OF 108W AND IS MOVING 
EAST. A LARGE AREA OF DRY AND CLOUD FREE MIDDLE AND UPPER LEVELS 
IS ELSEWHERE EAST OF 135W AND NORTH OF A LINE 23N135W 15N120W 
17N110W 23N100W. THIS AREA IS ESSENTIALLY A WEAK MAINLY UPPER 
LEVEL TROUGH TRAILING BEHIND THE STRONG SHORTWAVE.  

ELSEWHERE BROAD ANTICYCLONIC FLOW IS OBSERVED. AN AREA OF UPPER 
MOISTURE AND MULTI LEVEL CLOUDS WITH SOME EMBEDDED CONVECTION IS 
EMANATING FROM THE ITCZ EAST OF A LINE FROM THE ITCZ NEAR 120W 
TO 15N105W TO EXTREME SE TEXAS AND WEST OF 95W.

SURFACE...MODERATE TO STRONG RIDGE IS NORTH OF 10N WEST OF 100W 
EXCEPT FOR THE SURFACE LOW OVER MEXICO ASSOCIATED WITH THE 
STRONG SHORTWAVE. REMAINDER OF THE AREA IS ANALYZED AS A BROAD 
TROUGH.

GAP WINDS IN THE GULF OF PAPAGAYO REGION ARE 20 TO 25 KT AND 
WILL FALL TO 20 KT WEDNESDAY AND THROUGH WEDNESDAY NIGHT.

NORTHERLY WINDS IN THE SOUTHERN GULF OF CALIFORNIA WILL DIMINISH 
LATE WEDNESDAY.

GAP WINDS WILL BEGIN IN THE GULF OF TEHUANTEPEC LATE WEDNESDAY 
AND RAPIDLY INCREASE TO GALE FORCE WEDNESDAY NIGHT. 

$$
LL