000
AXPZ20 KNHC 220346
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC WED MAR 22 2006

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 
0345 UTC.

...ITCZ...
ITCZ AXIS ALONG 4N77W 6N90W 2N110W 3N130W 3N140W. NO SIGNIFICANT 
CONVECTION.

...DISCUSSION...
W OF 100W...
BROAD TROUGH DOMINATES THE AREA N OF 18N WITH MEAN AXIS ALONG 
115W. TROUGH WAS ACCOMPANIED BY MODERATE TO STRONG MID TO UPPER 
LEVEL SUBSIDENCE GENERALLY FROM 18N TO 30N BETWEEN 105W AND 
130W. SHORTWAVE TROUGH MOVING THROUGH THE MAIN TROUGH EXTENDS 
FROM A CYCLONIC CIRCULATION OVER NW ARIZONA SWWD THROUGH 30N115W 
TO 23N122W. FURTHER W...MID/UPPER LEVEL RIDGE WAS MOVING INTO 
THE FAR W PORTION OF THE DISCUSSION AREA...GENERALLY N OF 20N W 
OF 128W. ZONAL FLOW CHARACTERIZED THE TROPICS WITH A WEAK UPPER 
LEVEL TROUGH S OF 12N ALONG 130W MOVING EWD 15-20 KT. DRY AIR IN 
THE REGION WAS SUPPRESSING CONVECTION ALONG THE ITCZ. AT THE 
SURFACE...WEAKENING COLD FRONT EXTENDED FROM THE CENTRAL SEA OF 
CORTEZ/BAJA CALIFORNIA TO 24N125W. OTHER THAN AN SLIGHT INCREASE 
IN NWLY WINDS BEHIND THE FRONT VERY LITTLE WEATHER IS ASSOCIATED 
WITH THE FRONT. BROKEN TO LOCALLY OVERCAST STRATOCUMULUS COVERED 
THE AREA N OF 10N W OF 112W. 

E OF 100W...
BROAD MID TO UPPER LEVEL RIDGE WITH MEAN AXIS WELL E OF THE AREA 
ALONG 75-80W DOMINATED VIRTUALLY THE ENTIRE AREA. A 300 NM WIDE 
RIBBON OF MID TO UPPER LEVEL MOISTURE WAS STREAMING NEWD ACROSS 
CENTRAL MEXICO AND THE GULF OF MEXICO. STRONG SUBSIDENCE WAS 
INDICATED S OF THIS RIBBON OVER CENTRAL AMERICA...THE CARIBBEAN
SEA AND THE E OF 100W. THIS DRY AIR WAS ALSO SUPPRESSING 
CONVECTION ALONG THE ITCZ. 

$$
COBB