000
AXPZ20 KNHC 281521
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU JAN 28 2010

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...

THE ITCZ AXIS WAS ANALYZED ALONG 05N77W TO 03N80W TO 05N90W TO 
05N105W TO 06N110W TO 04N125W TO 04N140W. SCATTERED MODERATE 
ISOLATED STRONG CONVECTION IS LOCATED WITHIN 60 NM EITHER SIDE 
OF A 05N100W TO 06N106W LINE.   

...DISCUSSION...

W OF 105W...
A MIDDLE/UPPER LEVEL TROUGH IS MOVING EASTWARD ACROSS THE NW 
PART OF THE DISCUSSION AREA WITH THE AXIS TILTED FROM NEAR 
35N144W TO 30N139W. ASSOCIATED COLD FRONT EXTENDS FROM NEAR 
32N138W TO BEYOND 29N140W. WATER VAPOR IMAGERY AND SATELLITE 
CLOUD DRIFT WINDS INDICATE STRONG DIFFLUENCE ALOFT N OF ABOUT 
27N W OF 130W. A BROAD MIDDLE/UPPER LEVEL RIDGE COVERS THE AREA 
N OF ABOUT 25N BETWEEN 122W AND 132W. MOVING DOWNSTREAM A 
MIDDLE/ UPPER LEVEL TROUGH IS LOCATED N OF 18N E OF 122W WITH 
THE AXIS STRETCHING THROUGH 32N108W TO 18N115W. STRONG 
SUBSIDENCE COVERS A VAST AREA FROM ABOUT 05N TO 25N W OF 125W. 
MODERATE WESTERLY WINDS ALOFT ARE LOCATED S OF 05N TO THE 
EQUATOR W OF 115W AND BECOME SOUTHWESTERLY BETWEEN 105W AND 115W 
S OF 15N. NORTHWEST SWELLS AS HIGH AS 18 FEET WILL BE LOCATED 
BEHIND THE COLD FRONT MENTIONED ABOVE.

E OF 105W...
WINDS ALOFT ARE MOSTLY SOUTHWESTERLY TO WESTERLY E OF 105W. GAP 
WINDS BELOW GALE FORCE ARE LOCATED OVER THE GULF OF 
TEHAUNTEPEC...THE GULF OF PAPAGAYO...AND THE GULF OF PANAMA.

FOR ADDITIONAL INFORMATION PLEASE VISIT 
HTTP://WWW.HURRICANES.GOV/MARINE

$$
CAB