000
AXPZ20 KNHC 191514
TWDEP 

TROPICAL WEATHER DISCUSSION     
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU MAR 19 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 2N79W 4N85W EQUATOR AT 115W TO 2N140W. NO 
SIGNIFICANT CONVECTION.

...DISCUSSION...

WEAK UPPER LEVEL RIDGE IS N OF 25N W OF 133W...WITH A SHORT WAVE 
TROUGH E OF THE RIDGE MOVING OVER THE FAR N PORTION OF THE 
DISCUSSION AREA FROM 32N127W TO 27N127W. A 90-100 KT JET STREAM 
EXTENDS FROM 21N140W TO 23N124W. MID TO UPPER LEVEL MOISTURE IS 
MOVING EWD S OF THE JET W OF 130W. SHORT WAVE UPPER RIDGE WITH 
AXIS FROM SE ARIZONA TO SOUTHERN BAJA CALIFORNIA.

IN THE DEEP TROPICS AN UPPER LEVEL TROUGH WITH AXIS FROM 15N120W 
TO THE EQUATOR AT 110W...WITH DOWNSTREAM RIDGE FROM GUATEMALA TO 
A ANTICYCLONIC CIRCULATION NEAR THE EQUATOR AT 88W. MODERATE TO 
STRONG SUBSIDENCE WITH DRY STABLE AIR AT THE MIDDLE AND UPPER 
LEVELS OF THE ATMOSPHERE COVERS THE AREA S OF 15N E OF 130W. 
THIS SUBSIDENCE AS SUPPRESSED CONVECTIVE ACTIVITY ALONG THE ITCZ
WITH ONLY SCATTERED LOW CLOUDS ACROSS THIS AREA.

SURFACE RIDGE EXTENDS FROM A 1025 MB HIGH PRES JUST N OF THE 
AREA NEAR 33N136W TO 16N109W. BROKEN TO OVERCAST STRATOCUMULUS 
CLOUDS BLANKET THE AREA N OF 15N W OF 115W. A SURFACE TROUGH IS 
ALONG THE MIDDLE OF THE GULF OF CALIFORNIA...NO WEATHER 
ASSOCIATED WITH THE TROUGH.

$$
DGS