000
AXPZ20 KNHC 060352
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC THU SEP 06 2012

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS 
BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0245 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
THE MONSOON TROUGH IS ALONG 09N85W TO 11N100W TO 08N118W. THE 
INTERTROPICAL CONVERGENCE ZONE AXIS EXTENDS FROM 08N118W TO 
06N126W TO 09N140W. SCATTERED MODERATE CONVECTION IS FROM 04N TO 
12N BETWEEN 106W AND 118W.

...DISCUSSION...
DRY SOUTHWESTERLY FLOW ALOFT IS NOTED ON WATER VAPOR IMAGERY 
OVER THE NW CORNER OF THE DISCUSSION AREA N OF A LINE FROM 
18N140W TO 32N123W IN ASSOCIATION WITH AN UPPER LEVEL LOW 
CENTERED NORTH OF THE AREA NEAR 39N129W. REMAINING N OF 20N EAST 
OF THAT LINE...AN UPPER LEVEL ANTICYCLONIC CIRCULATION IS 
CENTERED IN THE NORTHERN GULF OF CALIFORNIA NEAR 31N113W THAT IS 
ADVECTING MIDDLE TO UPPER LEVEL MOISTURE WESTWARD BETWEEN 107W 
AND 120W. EMBEDDED WITHIN THE SOUTHWESTERN PERIPHERY OF THIS 
UPPER LEVEL RIDGING...THE REMNANT OF JOHN IS CENTERED NEAR 
26N121W AND CONTINUES TO DISSIPATE GRADUALLY DUE TO EVER MORE 
COOLER WATERS THE FARTHER NORTHWEST IT TRACKS. THE LOW IS 
EXPECTED TO DISSIPATE WITHIN THE NEXT 24 HOURS WITH WINDS AND 
SEAS FALLING BELOW HIGH SEAS ADVISORY CRITERIA.

S OF 20N WITHIN THE MONSOON TROUGH AND ITCZ AREAS...MOSTLY UPPER 
LEVEL EASTERLY FLOW IS NOTED ON WATER VAPOR IMAGERY ON THE 
SOUTHERN PERIPHERY OF AN UPPER LEVEL ANTICYCLONIC CIRCULATION 
CENTERED OVER SOUTHERN MEXICO NEAR 18N96W. THIS MIDDLE TO UPPER 
LEVEL MOISTURE AND MARGINALLY DIFFLUENT AREA FROM 06N TO 15N 
BETWEEN 80W AND 110W IS GENERATING AREAS OF WIDELY SCATTERED 
MODERATE CONVECTION AND LIES WITHIN CLOSE PROXIMITY TO THE 
MONSOON TROUGH AXIS AND AREAS OF MAXIMUM LOW-LEVEL MOISTURE 
CONVERGENCE.

FARTHER WEST...A 1014 MB LOW PRESSURE CENTER...THE REMNANT OF 
ILEANA...IS CENTERED NEAR 17N132W AND IS FORECAST TO DRIFT WEST 
AND DISSIPATE TO A SURFACE TROUGH BY LATE THURSDAY. A SMALL WIND 
FIELD OF 20 TO 25 KT STILL EXISTS WITHIN THE NORTHERN SEMICIRCLE 
AND THIS IS MOST LIKELY DUE TO THE REMAINING PRESSURE GRADIENT 
BETWEEN THE LOW AND A STRONG 1035 MB SURFACE HIGH CENTERED NORTH 
OF THE DISCUSSION AREA NEAR 45N146W. 

$$
HUFFMAN