000
AXPZ20 KNHC 290949
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC WED DEC 29 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 ANALYZED FROM 08N81W TO 05N90W TO 06N100W TO 08N116W TO 
08N126W TO 05N140W. NO SIGNIFICANT CONVECTION NEAR AXIS.

SCATTERED MODERATE WITHIN 90 NM OF LINE 15N107W TO 17N102W.

...DISCUSSION...
SHARP UPPER PATTERN FROM 32N103W DIGS SW TO ILL-DEFINED CYCLONIC 
VORTEX AT 14N135W.  WHILE SWATH DRY AIR MASS NOTED WITHIN 180 NM 
EITHER SIDE OF AXIS...UPSTREAM RIDGE ADVECTS ABUNDANT MOISTURE 
MAINLY NOTED N OF 24N W OF 112W.  WEAK 80 KT JET STREAM CARRIES 
MINOR AMOUNT OF MOISTURE NE ACROSS CENTRAL MEXICO INTO TEXAS.

AT THE SURFACE...
COLD FRONT ENTER BASIN NEAR CALIFORNIA-MEXICO BORDER AND BRINGS 
ANOTHER SHOT OF HEAVY PRECIPITATION INTO SOUTHERN CALIFORNIA 
LATER TODAY.  FRONT ALSO INTRODUCES NW WINDS INTO NE PART OF 
BASIN WHILE N PART OF GULF OF CALIFORNIA GETS BRIEF TASTE OF 
FRESH SW BREEZE THU AHEAD OF FRONT.  

HIGH PRES CENTER 1025 MB AT 27N134W SQUEEZED BY APPROACHING 
COLD FRONT TO ITS N PROMPTS FRESH NE TRADES FROM 06N TO 20N W OF 
125W THROUGH FORECAST PERIOD.  NEW SET OF NW SWELLS SPREAD SE 
THROUGH N HALF OF BASIN W OF 115W.

GULFS OF PAPAGAYO AND FONSECA START WINDING DOWN WITH THE LATTER 
WINDS GETTING BELOW 20 KT EARLY TODAY WHILE GULF OF PAPAGAYO 
SUBSIDES BY FRI.

$$
WALLY BARNES