000
AXPZ20 KNHC 080351
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC THU APR 08 2010

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0330 UTC.

...ITCZ...

AXIS IS CENTERED ALONG 07N77W TO 05N85W TO 07N97W TO 03N110W TO 
04N130W TO 03N140W. WIDELY SCATTERED MODERATE FROM 04N TO 07N 
BETWEEN 83W AND 90W...AND FROM EQUATOR TO 06N BETWEEN 103W AND 
111W. SCATTERED MODERATE TO ISOLATED STRONG FROM 01N TO 06N W OF 
128W.  

...DISCUSSION...

THE TAIL END OF A LONG WAVE TROUGH EXTENDS SW FROM THE SW U.S.TO 
BAJA CALIFORNIA NEAR 27N110W. A SMALL CYCLONIC CIRCULATION IS 
FURTHER W NEAR 27N127W. IN THE DEEP TROPICS...ACTIVE CONVECTION 
ALONG THE ITCZ IS MAINTAINING UPPER LEVEL RIDGING ALIGNED 
ROUGHLY ALONG 6N. 

AT THE SURFACE...SURFACE HIGH PRESSURE NW OF THE AREA IS STILL 
STRONG ENOUGH TO MAINTAIN A TIGHT PRESSURE GRADIENT BETWEEN THIS 
FEATURE AND THE ITCZ. FRESH TO STRONG WINDS CONTINUE FROM 05N TO 
22N W OF 120W. AN UPPER LEVEL TROUGH AND ASSOCIATED COLD FRONT 
WILL MOVE N OF 35 N THROUGH TOMORROW AND CAUSE THE ABOVE HIGH 
CENTER TO DISSIPATE...THEN BE REPLACED BY ANOTHER COLD FRONT SAT 
NIGHT. FOR THE NEXT 48 HOURS THE RESULTANT TIGHT PRESSURE 
GRADIENT WILL PRODUCE A LARGE AREA OF TRADES OVER JUST ABOUT THE 
ENTIRE WESTERN HALF OF THE AREA N OF THE ITCZ. 

A TIGHT PRES GRADIENT BETWEEN THE AFOREMENTIONED HIGH PRES AND 
TROUGHING OVER THE SIERRA MADRE OCCIDENTAL CONTINUES TO RESULT 
IN NW TO N WINDS OF 20-25 KT N OF 22N E OF 123W. THIS GRADIENT 
IS ALSO RESPONSIBLE FOR NW WINDS OF 20 TO 25 KT THROUGH THE GULF 
OF CALIFORNIA N OF 25N. 

FRESH TO STRONG TRADES OVER THE CARIBBEAN WATERS CONTINUES TO 
FUNNEL THROUGH INTO THE GULF OF PAPAGAYO RESULTING IN WINDS TO 
20 KT. THE WINDS WILL PULSE OVER THE FORECAST PERIOD WITH THE 
STRONGEST WINDS IN THE EARLY MORNING HOURS IN RESPONSE TO 
ENHANCED NOCTURNAL DRAINAGE FLOW.
 
NORTHERLY WINDS OVER THE GULF OF TEHUANTEPEC WILL PRODUCE 20 KT 
WINDS AND 8 FT SEAS ON FRIDAY MORNING AND LAST FOR 12 HOURS. 

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

$$
FORMOSA