000
AXPZ20 KNHC 200315
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SUN MAY 20 2007

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...

INTERTROPICAL CONVERGENCE ZONE IS CENTERED ALONG THE LINE... 
7N77W 8N110W 9N140W.  SCATTERED MODERATE TO STRONG CONVECTION IS 
WITHIN 75 NM OF THE FOLLOWING POINTS 8.6N92.2W AND 10.3N96W AND 
7.2N100.6W AND 10N101.7W.

...DISCUSSION...

MODERATE MIDDLE AND UPPER LEVEL SHORTWAVE IS NORTH OF 25N EAST 
OF 120W. LITTLE WEATHER AND FEW CLOUDS ARE ASSOCIATED WITH THE 
SYSTEM ALTHOUGH SOME UPPER LEVEL MOISTURE IS OBSERVED. THE 
SYSTEM IS EXPECTED TO REMAIN IN NEARLY THE SAME AREA THROUGH 36 
HOURS THEN MOVE EAST.

WEAK MOSTLY UPPER LEVEL TROUGH IS NORTH OF A LINE 30N108W 
20N120W 17N140W.  THIS SYSTEM IS DRY AND CLOUD FREE IN THE 
MIDDLE AND UPPER LEVELS. A PLUME OF MOISTURE WITH BROKEN HIGH 
CLOUDS IS ADVECTING NORTHEAST OVER MEXICO WITHIN 450 NM SOUTH OF 
THE LINE. THIS MOISTURE EMANATES FROM CONVECTION WITHIN THE ITCZ 
FROM 114W TO 131W.

REMAINDER OF THE AREA IS COVERED BY WEAK ANTICYCLONIC FLOW IN 
THE MIDDLE AND UPPER LEVELS.

MODERATE RIDGE IS NORTH OF 12N WEST OF 113W.  ELSEWHERE BROAD 
TROUGH IS ANALYZED.

GAP WINDS HAVE DIMINISHED IN THE GULF OF TEHUANTEPEC AREA.

$$
LL