000
AXPZ20 KNHC 042157
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC FRI JAN 04 2008

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN
FROM THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 2100 UTC.
 
...ITCZ...

INTERTROPICAL CONVERGENCE ZONE...2N79W 4N86W 4N100W 3N106W 
8N117W 7N130W 7N140W. SCATTERED STRONG SHOWERS AND THUNDERSTORMS 
FROM 7N TO 9N BETWEEN 131W AND 133W. SCATTERED MODERATE SHOWERS
TO ISOLATED STRONG THUNDERSTORMS WITHIN A 15 NM RADIUS OF 
7N129.5W. SCATTERED MODERATE FROM 8N TO 10N BETWEEN 126W AND 
127W. WARMING CLOUD TOP TEMPERATURES AND DISSIPATING 
PRECIPITATION WITHIN 60 NM TO 90 NM ON EITHER SIDE OF AXIS 
BETWEEN 110W AND 119W.

...DISCUSSION...

A DEEP LAYER TROUGH PASSES THROUGH 32N128W TO TO 28N129W TO
24N131W. THIS FEATURE IS THE ONE THAT HAS BEEN FORECAST TO
BRING WIND...RAIN...AND SNOW TO THE WESTERN U.S.A. A COLD FRONT 
PASSES THROUGH 35N130W TO 31N136W WITH THE TROUGH. UPPER LEVEL 
SOUTHWESTERLY WIND FLOW IS WITHIN 150 NM ON EITHER SIDE OF 
19N140W 22N130W 26N116W. UPPER LEVEL ANTICYCLONIC WIND FLOW
IS NORTH OF THE 19N140W 26N116W SOUTHWESTERLY WIND FLOW WEST
OF 130W. MIDDLE TO UPPER LEVEL SOUTHWESTERLY WIND FLOW
ASSOCIATED WITH AN EAST-TO-WEST RIDGE COVERS THE AREA NORTH
OF THE EQUATOR TO THE 19N140W 26N116W LINE WEST OF 110W.
1020 MB HIGH PRESSURE CENTER NEAR 26N120W IS SHIFTING TOWARD 
BAJA CALIFORNIA...MAINTAINING 20 KT TRADEWINDS TO ITS SOUTH.
A LARGE NORTHWESTERLY SWELL CONTINUES TO PROPAGATE INTO THE
AREA AHEAD OF THE COLD FRONT. 

GAP WINDS...GALE FORCE WINDS NOW ARE BLOWING THROUGH THE GULF
OF TEHUANTEPEC...THE STORM FORCE WINDS HAVE SUBSIDED. GALE FORCE 
WINDS ARE FORECAST FOR THE NEXT 12 HOURS OR SO...AND LESS THAN 
GALE FORCE AFTER 24 HOURS. EXPECT THE TEHUANTEPEC GAP WINDS TO 
DIMINISH TO GALE FORCE AS SURFACE HIGH PRESSURE TO THE NORTH 
SHIFTS EASTWARD AND THE WINDS VEER MORE SOUTHEASTERLY. GALE 
FORCE WINDS ARE BLOWING IN THE GULF OF PAPAGAYO...AND FORECAST 
TO BE LESS THAN GALE FORCE AFTER 12 HOURS OR SO. STRONG EASTERLY
WIND FLOW IN THE CARIBBEAN SEA WILL SUSTAIN GALE FORCE WINDS IN 
THE PAPAGAYO AREA FOR THE NEXT 12 HOURS OR SO. 

$$
MT