000
AXPZ20 KNHC 260305
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC WED AUG 26 2009

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 
0315 UTC.

...SPECIAL FEATURE...

TROPICAL STORM IGNACIO WAS CENTERED NEAR 20.4N 121.5W OR ABOUT 
765 MILES W OF THE SOUTHERN TIP OF BAJA CALIFORNIA AT 26/0300 
UTC...MOVING NW OR 305 DEGREES AT 13 KT. MAXIMUM SUSTAINED WINDS 
WERE 45 KT WITH GUSTS TO 55 KT AND THE ESTIMATED MINIMUM 
PRESSURE WAS 1000 MB. SCATTERED MODERATE TO STRONG CONVECTION IS 
CURRENTLY OBSERVED WITHIN 120 NM E AND WITHIN 60 NM W 
SEMICIRCLES BUT IS DECREASING IN BOTH INTENSITY AND COVERAGE. 
IGNACIO WILL CONTINUE TO MOVE ACROSS COOLER WATERS AND WEAKENING 
IS FORECAST. ADDITIONAL INFORMATION CAN BE FOUND UNDER AWIPS/ 
WMO HEADERS MIATCMEP3/WTPZ23 KNHC.
  
...TROPICAL WAVES...
A TROPICAL WAVE IS ALONG 87.5W N OF 05N MOVING W NEAR 15 KT OVER 
THE PAST 24 HOURS. SATELLITE IMAGERY INDICATES BROAD CYCLONIC 
TURNING CENTERED ON 12N87.5W. THE HEAVIEST CONVECTION IS 
DISSIPATING OVER HONDURAS AT THE MOMENT.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE IS ALONG AXIS FROM 07N77W TO 
08N100W TO 06N108W TO 14N123W TO 10N133W TO 11N140W. SCATTERED 
MODERATE ISOLATED STRONG CONVECTION IS NOTED WITHIN 60 NM LINE 
FROM 07N88W TO 06N94W...AND ALSO FROM 04N TO 14N BETWEEN 100W 
AND 114W...AND FROM 07N TO 12N BETWEEN 128W AND 137W.

...DISCUSSION...

THE MID TO UPPER PATTERN CONSISTS OF A RIDGE THAT EXTENDS FROM 
AN ANTICYCLONE NEAR 19N141W NE THROUGH 30N117W. AN UPPER TROUGH 
IS MOVING OVER THE NW PORTION OF THE AREA FROM 32N137W TO 
24N140W. A SECOND UPPER TROUGH EXTENDS S OVER THE NORTHERN GULF 
OF CALIFORNIA. DRY UPPER DOMINATES THE AREA W OF A LINE FROM 
26N112W TO 12N140W.

DEBRIS MOISTURE FROM TROPICAL STORM IGNACIO AND THE ITCZ 
CONVECTION W OF 100W DOMINATES THE AREA FROM 12N TO 25N BETWEEN 
111W AND 127W AND FROM 03N TO 12N W OF 100W. UPPER DEBRIS 
MOISTURE IS ALSO NOTED N OF 05N E OF 96W. 

AT THE SURFACE...HIGH PRES IS CENTERED N OF THE AREA WITH A 
RIDGE SE ALONG 32N125W TO 16N102W. 

GULF OF TEHUANTEPEC...N TO NE WINDS AT 20 TO 30 KT CONTINUE TO 
SURGE THROUGH THE GULF OF TEHUANTEPEC. THE NORTHERLY SURGE IS 
EXPECTED TO DIMINISH TO 20 TO 25 KT WED THROUGH THU.

$$
NELSON