000
AXPZ20 KNHC 270356
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC WED JAN 27 2010

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

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0315 UTC.

...ITCZ...

THE ITCZ AXIS ANALYZED ALONG 04N76W TO 05N84W TO 03N94W TO 
04N102W TO 05N118W TO 03N140W. ISOLATED TO SCATTERED MODERATE 
CONVECTION WAS OCCURRING WITHIN 150 NM N OF AXIS BETWEEN 103W 
AND 121W.

...DISCUSSION...

A NEGATIVE TILT UPPER LEVEL TROUGH AXIS WAS SHIFTING E AND WAS 
JUST OFFSHORE OF THE CALIFORNIA COAST TO NEAR 23N119W. A MID TO 
UPPER LEVEL LOW NEAR 31N121W WAS EMBEDDED WITHIN THIS UPPER 
TROUGH AND WAS MOVING SE WITHIN THE TROUGH. AMPLE MULTILAYERED 
MOISTURE WAS SWEEPING E AND NE OF THE FRONT AND N OF 28N...AND 
INTO S AND CENTRAL CALIFORNIA AND THE DESERT SW. BROAD SCALE 
LIFT E OF THIS LOW AND UPPER DIVERGENCE IN THE E AND SE 
QUADRANTS WAS INDUCING SCATTERED TO NUMEROUS MODERATE CONVECTION 
ACROSS SRN CALIFORNIA AND EXTREME NRN BAJA...WHICH WAS FURTHER 
BEING ENHANCED BY OROGRAPHIC LIFT ACROSS MOUNTAINOUS TERRAIN. 
THIS TROUGH WAS GRADUALLY MERGING WITH AN OLD LONGER WAVE MID TO 
UPPER TROUGH EXTENDING FROM THE ROCKIES S THROUGH NW OLD MEXICO 
THEN SW TO 17N130W.  

A SMALL WEAK UPPER CYCLONE WAS FILLING NEAR 08N104W. ANOTHER 
WEAK UPPER LEVEL CYCLONIC CURL WAS NOTED JUST TO THE NW NEAR 
12N114W...YIELDING UPPER LEVEL DIVERGENCE TO THE E AND SE...AND 
ENHANCING SCATTERED MODERATE CONVECTION N OF THE ITCZ AND E TO 
112W. 

AN UPPER LEVEL RIDGE EXTENDED FROM 06N92W N-NW TO BEYOND 30N97W. 
EXCEPT AS MENTIONED...THE UPPER LEVELS ARE VERY DRY S OF 27N 
ACROSS THE ENTIRE DISCUSSION AREA.

AT THE SURFACE...A COLD FRONT EXTENDS FROM 30N121W TO 25N131W TO 
25.5N140W. SURFACE HIGH PRESSURE HAS COLLAPSED SE OF THE FRONT 
NEAR 24N126W...LEAVING A WEAK RIDGE...WHILE A SMALL 1020 MB HIGH 
WAS NW OF THE FRONT NEAR 31N135W. THE FRONT IS EXPECTED TO 
CONTINUE MOVING E AND SE...REACHING CENTRAL BAJA WED 
AFTERNOON. NE TRADES TO 20 KT CONTINUE S OF THIS RIDGE 
OVER THE WATERS W OF 125W WITH THE ASSOCIATED NE SWELL COMPONENT 
MIXING WITH NW SWELLS PROPAGATING SE ACROSS THE PACIFIC WATERS W 
OF 88W. 

GAP WINDS...
N WINDS 25 TO 35 KT IN THE GULF OF TEHUANTEPEC ARE EXPECTED TO 
DIMINISH BELOW GALE WED AFTERNOON/EVENING. NE TO E TRADES OVER 
THE SW CARIBBEAN ARE FUNNELING INTO THE GULF OF PAPAGAYO AT 
20-25 KT AND EXPECTED TO INCREASE TO 20 TO 30 KT AND SPREAD NW 
TO INCLUDE THE GULF OF FONSECA WED NIGHT INTO THU. NORTHERLY 
WINDS ARE SURGING THROUGH THE GULF OF PANAMA WITH LITTLE CHANGE 
EXPECTED THROUGH THU.

FOR ADDITIONAL INFORMATION PLEASE VISIT 
HTTP://WWW.HURRICANES.GOV/MARINE

$$
STRIPLING