000
AXPZ20 KNHC 011000
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC FRI JAN 01 2010

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 
0945 UTC.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE FLUCTUATES ALONG 05N TO THE E 
OF 140W. ISOLATED CLUSTERS OF MODERATE CONVECTION IS NOTED FROM 
03N TO 06N BETWEEN 81W AND 85W. SCATTERED MODERATE ISOLATED 
STRONG CONVECTION IS FLARING NEAR 05N139W.
  
...DISCUSSION...

A SHORTWAVE RIDGE EXTENDS E ALONG 26N140W TO A CREST NEAR 
28N123W ACCOMPANIED BY UPPER MOISTURE. A MID TO UPPER TROUGH 
EXTENDS INTO THE AREA ALONG 30N100W TO 20N118W INTO AN UPPER 
CYCLONE CUTTING OFF NEAR 15N125W. AN UPPER TROUGH EXTENDS SE 
FROM THE CYCLONE TO A BASE AT 02N115W. DRY UPPER AIR IS NOTED 
WITHIN 180 NM EITHER SIDE OF THE TROUGH AXIS E OF 117W AND 
ELSEWHERE S OF 23N W OF 120W.

AN UPPER ANTICYCLONE IS CENTERED IN THE DEEP TROPICS NEAR 07N91W 
WITH A RIDGE CRESTING ALONG POINTS 14N118W AND 23N108W TO 
25N90W. UPPER MOISTURE ORIGINATING FROM FORMER ITCZ CONVECTION 
IS ADVECTED NE ALONG THE PERIPHERY OF THIS RIDGE WITHIN 180 NM 
EITHER SIDE OF LINE 11N117W TO 20N103W TO BEYOND 25N90W. DRY 
UPPER AIR IS NOTED ELSEWHERE W OF THE UPPER ANTICYCLONE.
 
AT THE LOW LEVELS HIGH PRESSURE IS CENTERED NEAR 32N122W WITH A 
CENTRAL PRESSURE OF 1027 MB. THE ASSOCIATED RIDGE COVERS THE 
AREA N OF 12N W OF 110W AND IS EXPECTED TO BLOCK AND APPROACHING 
FRONT TO THE EXTREME NW CORNER OF THE DISCUSSION AREA. 

GAP WINDS...
GULF OF TEHUANTEPEC...N WINDS OF 20 KT ARE EXPECTED TO QUICKLY 
INCREASE TO GALE FORCE AFTER SUNRISE TODAY AND FURTHER INCREASE 
TO STORM FORCE TONIGHT THROUGH LATE MORNING SAT THEN DIMINISH TO 
GALE FORCE INTO EARLY SUN. 

GULF OF PAPAGAYO...E WINDS OF 20 TO 30 KT ARE EXPECTED TO 
CONTINUE THROUGH SAT COVERING THE AREA FROM 09N TO 12N E OF 90W 
DIMINISHING SOME ON SUN.

GULF OF CALIFORNIA...NW WINDS AT 20 TO 25 KT ARE EXPECTED TO 
DIMINISH OVER THE NORTHERN GULF TONIGHT AND CONTINUE TO DIMINISH 
TO LESS THAN 20 KT SAT NIGHT.

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