000
AXPZ20 KNHC 082123
TWDEP 

TROPICAL WEATHER DISCUSSION     
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC THU FEB 08 2007

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS 
BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

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

...ITCZ...

ITCZ AXIS IS CENTERED ALONG 1N80W 5N86W 4N98W 4N140W. SCATTERED 
MODERATE WITHIN 60 NM OF THE AXIS BETWEEN 126W-131W.

...DISCUSSION...

A SPLIT FLOW PATTERN HAS TAKEN HOLD OVER THE NRN PART OF THE 
DISCUSSION AREA WITH THE FLOW DIVERGING NEAR 130W...SOME OF 
WHICH TURNS NE INTO A UPPER RIDGE OVER THE WRN U.S. AND THE 
OTHER PART WHICH DIVES SE INTO A TROUGH ALONG 114W. AN EXPANSIVE 
AND COMPLEX MID/UPPER LEVEL CYCLONIC GYRE WITH MULTIPLE EMBEDDED 
LOWS COVERS MUCH OF THE PACIFIC WATERS BETWEEN HAWAII AND ALASKA 
AND THE JET CURVES AROUND THE SRN PERIPHERY FROM 28N140W NE 
TOWARDS NRN CALIFORNIA. A COLD FRONT EXTENDS FROM 30N135W TO 
26N140W WITH A BROKEN BAND OF LOW/MID-LEVEL CLOUDS AND POSSIBLY 
A FEW SHOWERS EXTENDING UP TO 150 NM NW OF THE BOUNDARY. SOME 
COOLER AIR IS LOCATED N OF HAWAII BUT NOW THAT THE FRONT IS 
BECOMING PARALLEL TO THE UPPER FLOW...AND THERE IS A BLOCKING 
SURFACE HIGH OFF THE CALIFORNIA/BAJA COAST...THIS COOL AIR WON'T 
MAKE MUCH HEADWAY TO THE SE.

LARGE-SCALE SUBSIDENCE COVERS MUCH OF THE REGION S OF 20N AND W 
OF 100W COURTESY OF A MID-LEVEL HIGH NEAR 13N135W AND CONVERGENT 
FLOW INTO THE BASE OF THE TROUGH ALONG 114W. SCATTERED FAIR 
WEATHER CLOUDS EXTEND ACROSS THE TROPICAL/SUBTROPICAL WATERS BUT 
THE ITCZ IS FAIRLY LINEAR WITH NO OUTBREAKS OF DEEP CONVECTION.

ANOTHER MID-LEVEL RIDGE LIES ALONG 13N EXTENDING ACROSS CENTRAL 
AMERICA TO NEAR 10N110W...ALSO FOSTERING LARGE-SCALE SUBSIDENCE 
OVER THE WATERS S OF MEXICO/CENTRAL AMERICA. THE STRONGEST UPPER 
FLOW PENETRATES INLAND ACROSS MEXICO AND FOR THE MOST PART 
BYPASSES THE AREA. SKIES ARE NEARLY CLOUDLESS N OF THE ITCZ AND 
THE GAP FLOWS ARE FAIRLY TAME AT THE MOMENT (AT LEAST FOR THIS 
TIME OF YEAR).  

$$
BERG