000
AXPZ20 KNHC 291004
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC MON OCT 29 2007

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 0930 UTC.

...ITCZ....

9N81W 8N103W 14N120W 11N128W 13N137W 12N140W.
ISOLATED MODERATE SHOWERS WITHIN 60 NM ON EITHER SIDE
OF 8N78W 7N82W 6N90W 6N100W 7N105W...FROM 7N TO 14N
BETWEEN 105W AND 120W...AND FROM 13N TO 17N BETWEEN
132W AND 137W.

...DISCUSSION...

A MIDDLE TO UPPER LEVEL TROUGH EXTENDS FROM A CYCLONIC 
CIRCULATION CENTER NEAR 32N130W THROUGH 28N134W TO ANOTHER 
MIDDLE TO UPPER LEVEL CYCLONIC CIRCULATION CENTER NEAR 20N140W.
MIDDLE TO UPPER LEVEL MOISTURE WITHIN 600 NM EAST OF THE TROUGH
IS BEING PUSHED NORTHEASTWARD. MIDDLE TO UPPER LEVEL DRY AIR/
SUBSIDENCE IS PRACTICALLY EVERYWHERE IN THE EASTERN PACIFIC 
OCEAN EAST OF THE NORTHEASTWARD-MOVING MOISTURE.

AN UPPER LEVEL RIDGE EXTENDS FROM 16N121W NORTHEASTWARD
ACROSS NORTHERN BAJA CALIFORNIA INTO ARIZONA.

A MIDDLE LEVEL TROUGH EXTENDS FROM THE SOUTHWESTERN GULF OF 
MEXICO JUST WEST OF THE YUCATAN PENINSULA TO THE EASTERN ISTHMUS 
OF TEHUANTEPEC. A BROAD UPPER LEVEL TROUGH EXTENDS FROM SOUTH 
TEXAS ACROSS INTERIOR CENTRAL MEXICO.

A MIDDLE LEVEL TROUGH IS ALONG 13N105W TO THE MEXICO COAST
NEAR 22N106W.

SURFACE TROUGH ALONG 121W/122W FROM 11N TO 20N MOVING WEST
10 TO 15 KT. STRONG SHOWERS/THUNDERSTORMS WITHIN
A 40 NM RADIUS OF 13.5N124W.

A 1017 MB LOW PRESSURE CENTER IS NEAR 32N129W. BROAD SURFACE
CYCLONIC FLOW AROUND THIS CENTER NORTH OF 29N BETWEEN 126W
137W. NO DEEP CONVECTIVE PRECIPITATION.

GAP WINDS...STRONG HIGH PRESSURE IN NORTHERN MEXICO IS HELPING
TO CREATE GALE FORCE WINDS WHICH ARE EXPECTED TO LAST FOR THE 
NEXT 24 TO 42 HOURS.

$$
MT