000
AXPZ20 KNHC 261529
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC MON JAN 26 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 3N78W 6N85W 2N105W 9N130W 7N140W. NO SIGNIFICANT 
CONVECTION.

...DISCUSSION...
DEEP LAYER TROUGH EXTENDS FROM 32N128W TO CYCLONIC CIRCULATION 
NEAR 24N134W. ASSOCIATED SURFACE TROUGH FROM 28N135W TO 25N133W.
THE GRADIENT BETWEEN THE TROUGH AND A RIDGE TO THE N IS 
PRODUCING STRONG ELY WINDS N OF 22N W OF 115W. SCATTERED 
MODERATE SHOWERS ARE E OF THE TROUGH FROM 22N-25N WITHIN 180 NM 
E OF THE TROUGH. A 130-145 KT JET STREAM ENTERS THE AREA S OF 
THE TROUGH FROM 21N140W TO 16N130W. MODERATE TO STRONG 
SUBSIDENCE IS S OF THE JET TO 10N. DOWNSTREAM MID-UPPER LEVEL 
RIDGE EXTENDS FROM AN ANTICYCLONIC CIRCULATION CENTERED NEAR 
9N88W 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 S OF 20N E OF 110W. SKIES ARE MOSTLY 
CLEAR ACROSS THIS AREA EXCEPT FOR SOME BROKEN STRATOCUMULUS 
CLOUDS S OF THE ITCZ. AN UPPER LEVEL TROUGH IN THE DEEP TROPICS 
WITH AXIS FROM 10N109W TO THE EQUATOR AT 109W.

SURFACE TROUGH EXTENDS FROM 19N121W TO 11N129W. UPPER LEVEL 
DIFFLUENT IS ENHANCING CONVECTIVE ACTIVITY WITH THE TROUGH FROM 
15N-20N BETWEEN 123W-127W.

$$
DGS