000
AXPZ20 KNHC 200906
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC TUE JAN 20 2009

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...ITCZ...
AXIS ALONG 3N77W 6N115W 5N130W 6N140W. NO SIGNIFICANT CONVECTION.

...DISCUSSION...
A BROAD UPPER LEVEL RIDGE COVERS THE WESTERN PORTION OF THE 
DISCUCSSION AREA WITH ANTICYCLONIC FLOW W OF 130W. MODERATE TO 
STRONG SUBSIDINCE WITH DRY STABLE AIR AT THE MIDDLE AND UPPER 
LEVELS OF THE ATMOSPHERE  IS W OF 125W. A 90-105 KT JET STREAM 
IS OVER THE TOP OF THE RIDGE FROM 32N135W TO 23N126W. MID TO 
UPPER LEVEL TROUGH IS E OF THE RIDGE FROM 32N127W TO 25N121W TO 
CYCLONIC CIRCULATION CENTERED NEAR 12N119W. DIFFLUENT UPPER 
LEVEL FLOW SE OF THE CYCLONIC CIRCULATION IS SUPPORTING 
SCATTERED SHOWERS AND TSTMS FROM 6N-15N BETWEEN 108W-120W. 
MID/UPPER LEVEL RIDGE WITH AXIS FROM EASTERN ARIZONA ACROSS 
WESTERN MEXICO TO 15N96W. MODERATE TO STRONG SUBSIDENCE COVERS 
THE AREA S OF 20N E OF 100W...WITH MOSTLY CLEAR SKIES EXCEPT FOR 
BROKEN TO OVERCAST STRATOCUMULUS CLOUDS S OF THE ITCZ.

A 1014 MB SURFACE LOW IS CENTERED NEAR 20N129W. BROKEN TO 
OVERCAST LOW TOP CLOUDS WITH ISOLATED SHOWERS ARE WITHIN 200 NM 
OF THE LOW.  STATIONARY FRONT EXTENDS FROM 32N134W TO 25N135W
18N140W. OVERCAST LOW TOP CLOUDS WITH AREAS OF LIGHT RAIN ARE 
WITHIN 240 NM E OF THE FRONT N OF 22N.

$$
DGS