000
AXPZ20 KNHC 271514
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC TUE JAN 27 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 04N78W TO 01N110W TO 07N135W TO 06N140W. NO 
SIGNIFICANT CONVECTION.

...DISCUSSION...
DEEP LAYER TROUGH EXTENDS FROM 32N132W TO WELL DEFINED UPPER 
LEVEL CYCLONIC CIRCULATION NEAR 25N133W. ASSOCIATED 1014 MB 
SURFACE LOW IS CENTERED NEAR 22N133W TROUGH FROM LOW TO 18N140W. 
THE GRADIENT BETWEEN THE TROUGH AND A RIDGE TO THE N IS 
PRODUCING STRONG ELY WINDS TO GALE FORCE WITHIN 360 NM N OF THE 
LOW CENTER. ANOTHER SURFACE TROUGH IS ANALYZED FROM 22N123W TO 
11N133W. UPPER LEVEL DIFFLUENT FLOW E OF THE CYCLONIC 
CIRCULATION WITH A LARGE AREA OF CLOUDS WITH SHOWERS AND 
EMBEDDED TSTMS FROM 13N-24N BETWEEN 115W-127W. A 90-100 KT JET 
STREAM E OF THE TROUGH FROM 23N128W TO NORTHERN BAJA CALIFORNIA 
WITH WINDS INCREASE TO 125 KT. DOWNSTREAM MID-UPPER LEVEL RIDGE 
EXTENDS FROM AN ANTICYCLONIC CIRCULATION CENTERED NEAR 7N88W 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 
9N112W TO A CYCLONIC CIRCULATION NEAR THE EQUATOR AT 106W.

A 1010 SURFACE LOW ALONG THE ITCZ NEAR 4N79W. A FEW SHOWERS ARE 
NEAR THE CENTER OF THE LOW.

$$
DGS