000
AXPZ20 KNHC 201510
TWDEP 

TROPICAL WEATHER DISCUSSION     
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC FRI MAR 20 2009

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...
AXIS ALONG 8N84W 2N105W 4N130W 3N140W. NO SIGNIFICANT 
CONVECTION.

...DISCUSSION...
A BROAD UPPER LEVEL TROUGH IS OVER THE FAR NW PORTION OF THE 
DISCUSSION AREA N OF 25N W OF 130W. A 90-100 KT JET STREAM 
EXTENDS FROM 25N140W TO 26N115W...MID/UPPER LEVEL CLOUDS ARE S 
OF THE JET TO 15N. WEAK UPPER LEVEL RIDGE IS E OF THE TROUGH 
WITH AXIS FROM 30N125W TO 10N117W. DOWNSTREAM SHORT WAVE TROUGH 
EXTENDS FROM SOUTHERN CALIFORNIA TO THE CENTRAL BAJA PENINSULA.
BROKEN TO OVERCAST MIDDLE AND HIGH CLOUDS ARE WITHIN 240 NM E OF 
THE TROUGH. MID/UPPER LEVEL RIDGE IS OVER MEXICO.

IN THE DEEP TROPICS AN UPPER LEVEL TROUGH IS ALONG 110W S OF 15N
WITH AN UPPER LEVEL RIDGE E OF THE TROUGH FROM AN ANTICYCLONIC
CIRCULATION OVER COLOMBIA NW TO HONDURAS. STRONG SUBSIDENCE WITH 
DRY STABLE AIR AT THE MID AND UPPER LEVELS OF THE ATMOSPHERE 
COVERS THE AREA S OF 20N E OF 110W AND S OF 15N FROM 110W TO 
130W. THE SUBSIDENCE HAS SUPPRESSED CONVECTIVE ACTIVITY ALONG 
THE ITCZ...WITH JUST SCATTERED LOW CLOUDS ACROSS THIS AREA.

SURFACE RIDGE EXTENDS FROM 32N140W TO 18N104W. BROKEN TO 
OVERCAST STRATOCUMULUS CLOUDS ARE WITHIN THE RIDGE N OF 15N W OF 
115W. 

$$
DGS