000
AXPZ20 KNHC 121010
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SUN SEP 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 
0900 UTC.

...ITCZ...
AXIS FROM 12N110W TO 13N133W TO 12N140W.  SCATTERED MODERATE 
CONVECTION WITHIN 90 NM S OF AXIS FROM 111W TO 116W. 

.DISCUSSION...
UPPER LEVEL TROUGH FROM 32N126W TO 15N128W KEEPS MODERATE TO 
STRONG SUBSIDENCE W OF AXIS.  LARGE ANTICYCLONE OVER SE TEXAS 
COMBINES WITH TROUGH TO FUNNEL STRONG S WINDS ALOFT ALONG BAJA 
CALIFORNIA PENINSULA.  MODERATE TO STRONG EASTERLY SHEAR ON 
SOUTHERN PERIPHERY OF RIDGE CURTAILS DEVELOPMENT OF ANY 
SIGNIFICANT DEEP CONVECTION THAT MAY FORM OVER LAND DURING 
DAYTIME HEATING HOURS. 

AT THE SURFACE...
STATIONARY LOW PRES 1012 MB AT 13N134W WITH SCATTERED MODERATE 
TO STRONG CONVECTION WITHIN 150 NM RADIUS OF CENTER.  FRESH TO 
STRONG BREEZE WITHIN 240 NM NW QUADRANT AND 120 NM ELSEWHERE OF 
CENTER WITH SEAS TO 9 FT. 

HIGH PRES 1016 MB OVER GULF OF MEXICO EXPECTED TO FUNNEL N WINDS 
ACROSS ISTHMUS OF TEHUANTEPEC WITH FRESH TO STRONG N WINDS 
REACHING ITS S COAST.  WEAKENED HIGH PRES 1023 MB WELL N OF 
BASIN FORCES TIGHT GRADIENT WITH LOW PRES AT 13N134W TO PROMPT 
STRONG NE WINDS IN ITS NW QUADRANT.

$$
WALLY BARNES