000
AXPZ20 KNHC 080316
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC TUE MAY 08 2007

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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0300 UTC.

...ITCZ...
INTERTROPICAL CONVERGENCE ZONE IS ALONG THE LINE...4N77W 12N110W 
7N140W. SCATTERED MODERATE WITH ISOLATED STRONG CONVECTION IS 
WITHIN 60 NM OF THE POINT 9.5N103.2W. SCATTERED MODERATE WITH  
ISOLATED STRONG CONVECTION IS WITHIN 120 NM OF THE POINT 
12.4N110.5W. SCATTERED MODERATE CONVECTION IS WITHIN 60 NM OF 
THE FOLLOWING POINTS 7.8N132.8W AND 7.7N137.8W.

...DISCUSSION...
STRONG MIDDLE AND UPPER LEVEL SHORTWAVE TROUGH IS OVER THE 
SOUTHWEST U.S. AND NORTHWESTERN MEXICO N OF 24N EAST OF 122W. 
THE AREA IS DRY AND CLOUD FREE IN THE MIDDLE AND UPPER LEVELS 
AND IS ALSO CLEAR IN THE LOWER LEVELS. THE EXCEPTION IS 
CLOUDINESS FROM PREVIOUS CONVECTION NORTHEAST OF THE SYSTEM OVER 
SOUTHERN NEW MEXICO AND ARIZONA. THE TROUGH IS EXPECTED TO STAY 
IN PLACE FOR ABOUT THE NEXT 48 HOURS THEN DRIFT EAST AND WEAKEN. 

A BROAD MIDDLE AND UPPER LEVEL TROUGH IS OVER THE AREA NORTH OF 
A LINE 20N100W TO 15N140W. THIS AREA IS ALSO DRY AND CLOUD FREE 
IN THE MIDDLE AND UPPER LEVELS WITH BROKEN TO OVERCAST 
STRATOCUMULUS IN THE LOWER LEVELS. 

THE REMAINDER OF THE AREA IS COVERED BY A BROAD UPPER 
ANTICYCLONIC FLOW. CONVECTION FROM THE ITCZ IS PROVIDING UPPER 
MOISTURE AND BROKEN MIDDLE AND UPPER CLOUDS IN THIS AREA FROM 
105W TO 132W.  ITCZ CONVECTION IS ALSO SUPPLYING UPPER MOISTURE 
AND CLOUDS NORTH OF THE ITCZ EAST OF 90W. THESE CLOUDS ARE 
ADVECTING OVER THE CENTRAL AMERICAN ISTHMUS FROM NICARAGUA 
SOUTHWARD.

AT THE SURFACE A WEAKENING MODERATE RIDGE IS NORTH OF THE ITCZ 
WEST OF 110W. BROAD TROUGH IS ANALYZED ELSEWHERE.

$$
LL