000
AXPZ20 KNHC 281525
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC WED JAN 28 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 4N78W 5N90W 1N100W 2N140W. NO SIGNIFICANT CONVECTION.

...DISCUSSION...
MIDDLE TO UPPER LEVEL TROUGH EXTENDS FROM CYCLONIC CIRCULATION 
NEAR 29N136W 15N133W TO 10N123W. AN 80-100 KT JET STREAM E OF THE
TROUGH FROM 20N123W TO NORTHERN BAJA CALIFORNIA AND INTO 
NORTHERN MEXICO. BROKEN TO OVERCAST CIRRUS CLOUDS ARE WITHIN 420 
NM SE OF THE JET. DOWNSTREAM MID-UPPER LEVEL RIDGE EXTENDS FROM 
AN ANTICYCLONIC CIRCULATION CENTERED NEAR 7N90W 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.

SURFACE TROUGH WITH AXIS FROM 21N124W TO 15N131W. A TIGHT PRES 
GRADIENT BETWEEN THE TROUGH AND STRONG HIGH PRES TO THE N IS 
PRODUCING STRONG ELY WINDS ACROSS THE PACIFIC N OF 20N W OF 115W.

$$
DGS