000
AXPZ20 KNHC 120927
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC FRI FEB 12 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...
INTERTROPICAL CONVERGENCE ZONE AXIS IS ANALYZED ALONG THE LINE 
03N77W TO 02N87W TO 06N107W TO 08N116W TO 01N140W. SCATTERED 
MODERATE ISOLATED STRONG WITHIN 270 NM N OF AXIS BETWEEN 84W AND 
88W. SCATTERED MODERATE WITHIN 240 NM N OF AXIS BETWEEN 107W AND 
122W.

...DISCUSSION...
A HIGH AMPLITUDE UPPER LEVEL TROUGH EXTENDS FROM BAJA CALIFORNIA 
CROSSING THE EQUATOR NEAR 121W. PV MAPS FROM U OF ALBANY WEB 
SITE INDICATES THIS FEATURE IS RATHER STRONG...PARTICULARLY NEAR 
13N120W...AND THERE IS SURFACE BASED CONVECTION OVER THE FAVORED 
E PORTION OF THE TROUGH NEAR THIS LATITUDE. SW WINDS ON THE E 
SIDE OF THE TROUGH IS ADVECTING UPPER LEVEL MOISTURE ACROSS S 
MEXICO. RIDGING PREVAILS ON EITHER SIDE OF THE TROUGH OVER THE E 
AND W PART OF THE AREA.  

AT THE SURFACE A 1024 MB HIGH PRES IS CENTERED NEAR 29N124W. A 
TIGHT PRESSURE GRADIENT BETWEEN THIS FEATURE AND THE ITCZ IS 
RESULTING IN FRESH TO STRONG TRADES OVER THE AREA W OF 111W. 
LATEST ASCAT PASS INDICATES 20 TO 25 KT TRADES ACROSS THIS AREA. 
A DISSIPATING COLD FRONT EXTENDS ACROSS THE NW PORTION OF THE 
AREA FROM 30N134W TO 27N140W.

GAP WINDS...
LOW PRESSURE IN THE GULF OF MEXICO WILL SHIFT E AND DRAG A COLD 
FRONT ACROSS THE GULF. COLD AIR WILL FUNNEL THROUGH THE ISTHMUS 
OF TEHUANTEPEC AND RESULT IN GALE FORCE WINDS TOMORROW NIGHT. 
WINDS ARE EXPECTED TO DIMINISH BELOW GALE FORCE SAT NIGHT.  

STRONG TRADES OFF THE COLOMBIAN COAST CONTINUE TO FUNNEL THROUGH 
THE GULF OF PANAMA. THE TRADES OVER THE CARIBBEAN WILL  DIMINISH 
TODAY...AND WINDS OVER THE GULF OF PANAMA WILL DIMINISH. 

FRESH TRADES ACROSS THE SW CARIBBEAN ARE FUNNELING THROUGH THE 
GULF OF PAPAGAYO TO PRODUCE 20 TO 25 KT WINDS THROUGH THE 
MORNING HOURS. WINDS WILL DIMINISH TODAY AS TRADES IN OVER THE 
SW CARIBBEAN DIMINISH. 

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

$$
AL