000
AXPZ20 KNHC 220926
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC THU JAN 21 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 
0900 UTC.

...ITCZ...
AXIS ALONG 04N77W TO 06N101W TO 04N108W TO 06N118W TO 08N130W TO 
06N140W. SCATTERED MODERATE CONVECTION WITHIN 60 NM S OF AXIS 
BETWEEN 81W TO 86W. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION WITHIN 90 NM N AND 60 NM S OF AXIS BETWEEN 94W AND 
102W. ISOLATED MODERATE AND ISOLATED STRONG CONVECTION WITHIN 90 
NM OF AXIS W OF 116W.

...DISCUSSION...
A NARROW UPPER LEVEL TROUGH EXTENDS FROM NICARAGUA TO SMALL BUT 
WELL DEFINED CYCLONE AT 08N103W. POLAR VORTEX REMAINS WELL N OF 
THE REGION OVER THE FAR NE PACIFIC WITH NEGATIVELY TILTED TROUGH 
EXTENDING SE TO JUST OFFSHORE THE NW PACIFIC COAST. ASSOCIATED 
COLD FRONT AT THE SURFACE IS PRODUCING GALE FORCE WINDS N OF 
26N. 

AT THE SURFACE...THE COLD FRONT MENTIONED IN PREVIOUS PARAGRAPH 
EXTENDS FROM 27N114W TO 17N140W. GALE FORCE WINDS REMAIN N OF 
26N W OF THE FRONT...THOUGH LATEST ASCAT PASS INDICATES WINDS 
STARTING TO DIMINISH. WITH ONLY WEAK HIGH PRESSURE 1014 MB 
CENTERED NEAR 21N109W...FRESH TO STRONG TRADES ARE CONFINED TO A 
SMALL AREA W OF 129W...S OF RIDGE OF HIGH PRESSURE BUILDING IN 
BEHIND THE COLD FRONT. THE COLD FRONT WILL WEAKEN OVER THE NEXT 
24 HOURS ACROSS THE AREA. HIGH PRESSURE WILL CONTINUE TO BUILD 
ACROSS THE AREA BEHIND THE FRONT OVER THE NEXT 24 HOURS AND WILL 
INCREASE THE COVERAGE OF FRESH TO STRONG TRADES ACROSS THE 
TRADEWIND BELT. A COLD FRONT WILL MOVE INTO THE FAR NW PORTION 
OF THE AREA SUN NIGHT. NEAR GALE FORCE WINDS WILL PRECEDE THE 
FRONT N OF 28N W OF 135W SAT NIGHT. 

LONG PERIOD NW SWELL CONTINUE TO DOMINATE THE AREA W OF 
98W...WITH 30+ FT SEAS IN THE FAR N PORTION OF THE AREA. WITH 
WINDS STARTING TO DIMINISH BEHIND THE FRONT...SWELLS WILL 
GRADUALLY SUBSIDE THROUGH THE WEEKEND. 

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

$$
AL