000
AXPZ20 KNHC 300919
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC MON APR 30 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...ITCZ...

INTERTROPICAL CONVERGENCE ZONE IS ALONG LINE...6N77W 7N105W 
6N140W. SCATTERED MODERATE WITH ISOLATED STRONG CONVECTION IS 
WITHIN 45 NM OF THE POINTS 6.2N82.3W. AND 6.3N86.9W. SCATTERED 
MODERATE WITH ISOLATED STRONG CONVECTION IS WITHIN 75 NM OF THE 
POINT 8.3N96.3W. SCATTERED MODERATE TO STRONG CONVECTION IS 
WITHIN 120 NM OF THE POINT 7N100.5W. SCATTERED MODERATE WITH 
ISOLATED STRONG CONVECTION IS WITHIN 100 NM OF THE POINT 
7.6N106W. SCATTERED MODERATE WITH ISOLATED STRONG CONVECTION IS 
WITHIN 45 NM OF THE POINTS 9.3N126.4W AND 6.2N135W.

...DISCUSSION...

CYCLONIC CIRCULATION THAT HAS BEEN OVER NORTHERN MEXICO IS 
MOVING OVER WESTERN TEXAS AWAY FROM THE AREA. ALSO THE 
ASSOCIATED WEATHER IS EAST OF THE CIRCULATION AND IS OVER 
CENTRAL TEXAS.

A MIDDLE AND UPPER LEVEL TROUGH IS OVER THE NORTHWEST PART OF 
THE AREA. THE TROUGH IS NORTHWEST OF A LINE 32N123W TO 20N140W. 
THE AREA IS MOSTLY DRY AND CLOUD FREE IN THE MIDDLE AND UPPER 
LEVEL EXCEPT FOR SOME THIN HIGH CLOUDS AND UPPER LEVEL MOISTURE 
NORTH OF 27.5N WEST OF 130W.  IN THE LOWER LEVEL OVERCAST 
STRATOCUMULUS IS IN THE AREA WITH BROKEN STRATOCUMULUS WEST OF 
135W.

A PLUME OF MIDDLE AND UPPER LEVEL MOISTURE IS WITHIN THE AREA 
BOUNDED BY THE LINE 20N140W 30N120W 20N100W 15N125W TO THE ITCZ 
NEAR 125W. ONLY SCATTERED TO BROKEN HIGH CLOUDS ARE WITHIN THIS 
AREA.

REMAINDER OF THE AREA IS COVERED BY BROAD MIDDLE AND UPPER LEVEL 
ANTICYCLONIC CIRCULATION.  AN EXCEPTION IS WEAK TROUGH SOUTH OF 
THE ITCZ WEST OF 105W.

CONVECTION IS ACTIVE NEAR AND WITHIN THE ITCZ FROM 92W TO 108W.  
UPPER LEVEL MOISTURE EMANATING FROM THIS CONVECTION IS FLOWING 
NORTHEAST TOWARD THE CENTRAL AMERICAN ISTHMUS. OTHERWISE THE 
AREA SOUTH OF 20N EAST OF 125W IS MOSTLY DRY IN THE MIDDLE AND 
UPPER LEVELS.

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

$$
LL