000
AXPZ20 KNHC 230924
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SAT JAN 23 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 
0915 UTC.

...ITCZ...
AXIS ALONG 05N77W TO 04N83W TO 05N102W TO 04N112W TO 06N140W. 
SCATTERED MODERATE CONVECTION WITHIN 60 NM EITHER SIDE OF AXIS E 
OF 92W. SCATTERED MODERATE CONVECTION WITHIN 120 NM N OF AXIS 
BETWEEN 100W AND 118W. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION WITHIN 90 NM EITHER SIDE OF AXIS W OF 125W. 

...DISCUSSION...
A BROAD MID TO UPPER LEVEL RIDGE PREVAILS ALONG THE W PORTION OF 
THE AREA...WITH TROUGHING PREVAILING ALONG THE E PORTION OF THE 
AREA N OF 16N. THE TROUGH AXIS IS ALONG MAINLAND MEXICO. 

AT THE SURFACE...WITH THE UPPER TROUGH CROSSING MAINLAND 
MEXICO...THE ASSOCIATED COLD FRONT HAS SHIFTED EASTWARD...WITH 
ONLY A DISSIPATING COLD FRONT REMAINING AT THE SURFACE ACROSS 
THE SOUTHERN PORTION OF THE GULF OF CALIFORNIA TO JUST WEST OF 
THE BAJA PENINSULA. THE COLD FRONT WILL BE DISSIPATED WITHIN 24 
HOURS. LONG PERIOD NW SWELLS GENERATED FROM WINDS BEHIND THIS 
FRONT CONTINUE TO PROPAGATE ACROSS THE FORECAST AREA. 

ANOTHER COLD FRONT WILL SHIFT INTO THE NW PORTION OF THE 
FORECAST AREA SUN. AHEAD OF THIS COLD FRONT...NEAR GALE FORCE SW 
WINDS WILL AFFECT THE NW PORTION OF THE AREA BY SAT AFTERNOON. 
WINDS BEHIND THIS FRONT WILL GENERATE ANOTHER ROUND OF LONG 
PERIOD NW SWELLS WHICH WILL ENTER THE NW PORTION OF THE FORECAST 
AREA SAT NIGHT. 

SURFACE HIGH PRESSURE 1017 MB IS CENTERED JUST WEST OF THE 
FORECAST AREA...NEAR 26N141W...WITH WEAK RIDGE EXTENDING SE TO 
118W. AS A RESULT...FRESH TO STRONG TRADEWINDS ARE FOUND MAINLY 
W OF 126W IN THE TRADEWIND BELT. THE SURFACE HIGH IS FORECAST TO 
SHIFT EASTWARD OVER THE NEXT 48 HOURS...WHICH WILL INCREASE THE 
COVERAGE OF FRESH TO STRONG TRADES. 

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

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AL