000
AXPZ20 KNHC 291513
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU JAN 29 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 04N77W TO 06N90W TO 01N115W TO 03N140W. NO 
SIGNIFICANT CONVECTION.

...DISCUSSION...
FLAT UPPER LEVEL RIDGE OVER THE FAR NW PORTION OF THE DISCUSSION 
AREA WITH AXIS FROM 31N140W TO 25N135W. A NEARLY E-W UPPER LEVEL 
TROUGH FROM SOUTHERN CALIFORNIA TO 32N125W 31N130W. A 100-125 KT 
JET STREAM EXTENDS FROM 27N122W ACROSS CENTRAL BAJA CALIFORNIA 
THROUGH NORTHERN MEXICO. MID-UPPER LEVEL RIDGE EXTENDS FROM AN 
ANTICYCLONIC CIRCULATION CENTERED NEAR 8N94W NWD ACROSS MEXICO. 
A LARGE AREA OF MODERATE TO STRONG SUBSIDENCE WITH VERY DRY 
STABLE AIR AT THE MIDDLE AND UPPER LEVEL OF THE ATMOSPHERE IS 
LOCATED S OF 20N E OF 115W. SKIES ARE MOSTLY CLEAR ACROSS THIS 
AREA EXCEPT FOR SOME BROKEN STRATOCUMULUS CLOUDS S OF THE ITCZ. 
A TROUGH IN THE DEEP TROPICS WITH AXIS FROM 15N130W TO THE 
EQUATOR AT 115W. BROKEN CIRRUS CLOUDS ARE STREAMING NEWD IN THE 
SW FLOW E OF THE TROUGH FROM FROM 127W TO 115W.

SURFACE RIDGE WITH AXIS FROM 32N133W TO 12N110W WITH 
ANTICYCLONIC FLOW COVERING THE AREA N OF 12N W OF 110W. BROKEN 
TO OVERCAST STRATOCUMULUS CLOUDS WITHIN THE RIDGE N OF 15N W OF 
120W.

$$
DGS