000
AXPZ20 KNHC 120904
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC FRI SEP 12 2008

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 
0900 UTC.

...TROPICAL WAVES...
TROPICAL WAVE HAS IS N OF 3N ALONG 86W MOVING W ABOUT 10-15 KT. 
ISOLATED MODERATE CONVECTION IS WITHIN 120 NM EITHER SIDE OF THE 
WAVE.

...ITCZ...
ITCZ AXIS IS CENTERED ALONG 8N89W 7N115W 12N130W TO 11N140W. NO 
SIGNIFICANT CONVECTION.

...DISCUSSION...
MID/UPPER LEVEL ANTICYCLONIC CIRCULATION OVER THE FAR W PORTION 
OF THE AREA CENTERED NEAR 23N39W WITH RIDGE EXTENDING NWD TO 
32N136W. A LARGE AREA OF MODERATE TO STRONG SUBSIDENCE WITH DRY 
AIR AT THE MID/UPPER LEVELS OF THE ATMOSPHERE COVERS THE AREA N 
OF 15N W OF 115W. A MID/UPPER LEVEL CYCLONIC CIRCULATION MOVING
ACROSS  SRN CALIFORNIA. THIS CIRCULATION IS EMBEDDED IN A RATHER 
SHARP TROUGH THAT EXTENDS INTO THE AREA NEAR 32N117W TO 23N125W. 
UPPER LEVEL ANTICYCLONIC CIRCULATION WELL E OF THE DISCUSSION 
AREA OVER ERN TEXAS WITH A RIDGE EXTENDING SW FROM THIS 
ANTICYCLONE ACROSS CENTRAL MEXICO AND INTO THE PACIFIC TO 
18N120W. MID/UPPER LEVEL MOISTURE IS CIRCULATING 
ANTICYCLONICALLY AROUND THE WRN PERIPHERY OF THE ANTICYCLONE 
OVER ERN TEXAS. THIS MOISTURE CONSISTS OF RESIDUAL MOISTURE FROM 
THE REMNANTS OF TROPICAL DEPRESSION LOWELL AND MOISTURE FROM 
SCATTERED MODERATE/ISOLATED STRONG CONVECTION OCCURRING OVER THE 
INTERIOR PORTION OF MEXICO.

SURFACE  RIDGE EXTENDS FROM 32N135W TO 22N125W. HIGH PRES 
COVERS THE AREA N OF 20N W OF 125W. BROKEN/OVERCAST 
STRATOCUMULUS CLOUDS COVER THE AREA N OF 20N W OF 115W.
A WEAK 1010 MB LOW IS ANALYZED ALONG THE ITCZ NEAR 13N130W. 
ONLY ISOLATED SHOWERS ASSOCIATED WITH THE LOW.

$$
DGS