000
AXPZ20 KNHC 261628
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC WED NOV 26 2008

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

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1545 UTC.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE AXIS EXTENDS FROM 08N83W TO 
04N90W TO 08N125W TO 06N140W. SCATTERED MODERATE WITHIN 120 NM 
OF AXIS BETWEEN 115W AND 120W. SCATTERED MODERATE FROM 09N TO 
11N BETWEEN 127W AND 129W.

...DISCUSSION...

MAIN WEATHER INFLUENCE CONTINUES TO BE A DEEP LAYERED TROUGH OFF 
THE U.S. WEST COAST. AN ASSOCIATED 1008 SURFACE LOW IS CENTERED 
ALONG CALIFORNIA COAST MOVING INLAND. A MODERATE TIGHT PRESSURE 
GRADIENT IS IN PLACE BETWEEN THE SURFACE LOW AND A 1028 MB HIGH 
IS CENTERED OVER COLORADO. A SHIP IN THE NORTHERN GULF OF 
CALIFORNIA REPORTED A 35 KT WIND EARLY THIS MORNING...BUT HAS 
REPORTED 20 TO 25 KT SINCE THEN. 

FURTHER WEST...A SURFACE TROUGH EXTENDS FROM THE LOW PRES TO 
NEAR 16N126W. AN ASCAT PASS FROM EARLIER THIS MORNING SHOWED 
WINDS TO 20 KT BEHIND THE TROUGH...N OF 25N. A 1027 MB SURFACE 
HIGH NEAR 28N148W WILL SHIFT EAST AS A SHORT WAVE RIDGE BUILDS 
BEHIND THE UPPER TROUGH. THIS WILL ENHANCE TRADE WINDS S OF THE 
RIDGE. 

A 1009 MB SURFACE LOW IS CENTERED NEAR 07N87W...PART OF A BROAD 
CIRCULATION THAT EXTENDS INTO THE SW CARIBBEAN. CYCLONIC FLOW 
AROUND THE CIRCULATION IS ENHANCING GAP WINDS THROUGH THE GULF 
OF PAPAGAYO...WHERE SHIPS AND ASCAT DATA SHOWED 20 TO 25 KT THIS 
MORNING. IN ADDITION...SHIP OBSERVATIONS INDICATE 15 TO 20 KT 
FLOW ON THE EAST SIDE OF THE LOW FROM THE GALAPAGOS TO 
PANAMA...ENHANCING MODEST CONVECTIVE BUILD UPS ALONG THE ITCZ. 

A SURFACE TROUGH INTERSECTS THE ITCZ NEAR ROUGHLY 127W...ON THE 
TRAILING EDGE OF THE SURFACE TROUGH MENTIONED EARLIER. THIS 
PROMPTING AREAS OF CONVECTION...AS WELL AS ENHANCING THE TRADE 
WIND FLOW SOUTH OF THE SURFACE HIGH. THE TROUGH WILL DISSIPATE 
INTO FRI AS UPPER LIFTS OUT.

$$
CHRISTENSEN