000
AXPZ20 KNHC 310912
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC THU JAN 31 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 
0845 UTC.
 
...ITCZ...
ITCZ AXIS IS CENTERED ALONG 1N80W 7N90W 5N109W 5N122W 8N132W 
7N140W. ISOLATED MODERATE CONVECTION NEAR 11N140W OTHERWISE NO 
SIGNIFICANT CONVECTION.

...DISCUSSION...

MID LEVEL TROUGH WITH AXIS ALONG 104W MOVING ESE TONIGHT. MID 
LEVEL RIDGE BUILDING ALONG 132W. ON THE SURFACE TONIGHT PACIFIC 
RIDGE WITH 1031 MB CENTER NEAR 33N132W EXTENDS SE TO 10N105W. 
THE RIDGE IS PRODUCING N AND NE WINDS 20 TO 25 KT OVER MUCH OF 
THE REGION N OF 10N W OF 115W WITH SEAS 9 TO 12 FT. WINDS ALONG 
THE BAJA COAST TONIGHT NWLY 15 TO 20 KT. GAP WINDS LIGHT 
ACCORDING TO SSMI IMAGERY. CROSS EQUATORIAL SE WINDS TO 20 KT S 
OF 4N W OF 120W ACCORDING TO SSMI. 

LATER DAY 1 THE STRONG MID LEVEL TROUGH CONTINUES EWD TO 100W 
WITH THE MID LEVEL RIDGE WEAKENING ALONG 125W. ON THE SURFACE 
LATER DAY 1 LITTLE CHANGE TO THE PACIFIC RIDGE AND IT'S WIND 
REGIME. GUSTY NLY WINDS THROUGH THE GULF OF CALIFORNIA AS THE 
PRES GRADIENT TIGHTENS WITH HIGH PRES BUILDING TO THE N. 

FOR DAY 2 STRONG WNW TO W MID LEVEL FLOW RESUMES N OF 28N 
FLATTENING OUT WHATS LEFT OF THE MID LEVEL RIDGE. ON THE SURFACE 
DAY 2 THE PACIFIC RIDGE WEAKENS AND NE TRADES DECREASE E OF 130W 
TO MOSTLY 15 TO 20 KT. FROM 15N TO 27N W OF 132W NE TO E WINDS 
WILL REMAIN FAIRLY STRONG AT 25 TO 30 KT WITH SEAS 9 TO 12 FT. 
GAP WINDS INCREASE THROUGH TEHUANTEPEC AND W OF COSTA RICA AS 
HIGH PRES TO THE N FORCES WINDS THROUGH THESE PASSES. WINDS 
MOSTLY 20 TO 25 KT.

$$
RRG