000
AXPZ20 KNHC 220928
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC THU JAN 22 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 05N77W TO 03N90W TO 05N110W TO 06N140W. NO 
SIGNIFICANT CONVECTION.

...DISCUSSION...
A MID/UPPER LEVEL TROUGH IS APPROACHING THE FAR NW PORTION OF 
THE DISCUSSION AREAS JUST NW OF ABROAD UPPER LEVEL RIDGE. THE 
RIDGE AXIS EXTENDS FROM 32N128W TO 13N140W. EXCEPT FOR THE 
TROUGH OVER THEN FAR NW ANTICYCLONIC FLOW COVERS THE AREA W OF 
120W. MODERATE TO STRONG SUBSIDENCE WITH DRY STABLE AIR AT THE 
MIDDLE AND UPPER LEVELS OF THE ATMOSPHERE IS W OF 120W. A 95-110 
KT JET STREAM IS BETWEEN THE TROUGH AND THE RIDGE FROM 26N140W 
TO 32N133W. MID TO UPPER LEVEL TROUGH IS E OF THE RIDGE FROM THE 
SOUTHERN CALIFORNIA COAST TO ALONG COAST OF BAJA CALIFORNIA TO 
10N113W. MID/UPPER LEVEL RIDGE WITH AXIS FROM EASTERN NEW MEXICO 
ACROSS THE MIDDLE OF MEXICO THROUGH CENTRAL MEXICO TO AN 
ANTICYCLONIC CIRCULATION OVER COLOMBIA. MODERATE TO STRONG 
SUBSIDENCE COVERS THE AREA S OF 20N E OF 95W...WITH MOSTLY CLEAR 
SKIES EXCEPT FOR BROKEN TO OVERCAST STRATOCUMULUS CLOUDS S OF 
THE ITCZ.

A 1014 MB SURFACE LOW  CENTERED NEAR 25N122W IS CONNECTED TO 
ANOTHER LOW WITH A TROUGH NNW TO A 1010 MB LOW NEAR 29N123W. AN 
OCCLUDED FRONT EXTENDS FROM THE LOW TO 31N120W THEN A COLD FRONT 
S TO 25N118W 14N124W. A WARM FRONT EXTENDS FROM 31N120W TO THE 
NORTHERN BAJA CALIFORNIA COAST NEAR 31N16W. OVERCAST LOW TOP 
CLOUDS WITH AREAS OF RAIN AND ISOLATED EMBEDDED SHOWERS ARE N OF 
23N WITHIN 150 NM E OF THE FRONT. HIGH PRES CENTERS ARE ANALYZED 
ON EITHER SIDE OF THE FRONT. A 1021 MB HIGH IS NEAR 25N127W AND 
ANOTHER 1018 MB HIGH IS NEAR 23N114W. ANOTHER COLD FRONT FROM 
32N138W TO 27N140W. NO SIGNIFICANT WEATHER ASSOCIATED WITH THE 
FRONT. ELSEWHERE... STRONG PRES GRADIENT OVER SOUTHERN MEXICO IS 
PRODUCING GALE FORCE WINDS THROUGH THE GULF OF TEHUANTEPEC 
SHOULD END LATER THIS MORNING.

$$
DGS