000
AXPZ20 KNHC 230922
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC WED DEC 23 2009

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 
0900 UTC.

...ITCZ...
AXIS IS ALONG 7N78W 3N105W 8N120W 9N135W 8N140W. NO SIGNIFICANT 
CONVECTION.

...DISCUSSION...
UPPER LEVEL TROUGH W OF THE AREA APPROACHING 144W WILL MOVE INTO 
THE WESTERN PORTION OF THE DISCUSSION AREA WITHIN THE NEXT 24 
HRS. A MID/UPPER LEVEL TROUGH HAS MOVE INLAND INTO 
CALIFORNIA...HOWEVER CYCLONIC FLOW EXTENDS SWD INTO NW MEXICO 
AND BAJA CALIFORNIA. OTHERWISE A LARGE UPPER LEVEL RIDGE 
DOMINATES MUCH OF THE AREA W OF AROUND 105W,..WITH AXIS FROM 
32N125W TO 10N110W. A 95-110 KT JETSTREAM EXTENDS FROM 22N140W 
THEN NE TO 29N125W THEN ACROSS NORTHERN BAJA CALIFORNIA AND NW 
MEXICO WHERE WINDS INCREASE TO 125-130 KT. SW WINDS BETWEEN THE 
RIDGE AND UPPER LEVEL TROUGH W OF THE AREA IS ADVECTING TROPICAL 
MOISTURE NWD ACROSS THE RIDGE. A SHARP UPPER LEVEL TROUGH 
EXTENDS FROM THE NW CARIBBEAN ACROSS HONDURAS AND NICARAGUA TO 
THE GALAPAGOS ISLANDS. MODERATE TO STRONG SUBSIDENCE WITH DRY 
STABLE AIR AT THE MIDDLE AND UPPER LEVELS OF THE ATMOSPHERE E OF 
115W HAS SUPPRESSED ITCZ CONVECTION.

A WEAK 1011 MB SURFACE LOW IS CENTERED NEAR 14N124W. ISOLATED 
SHOWERS WITH THE LOW EARLIER HAVE DISSIPATED. A COUPLE OF 
SURFACE TROUGHS ARE ANALYZED ALONG THE ITCZ. ONE IS FROM 12N-7N 
ALONG 111W A FEW SHOWERS ARE ALONG THE TROUGH. ANOTHER TROUGH 
EXTEND FROM 13N134W TO 8N135W. NO SIGNIFICANT WEATHER ASSOCIATED 
WITH THE TROUGH. OTHERWISE HIGH PRES RIDGE COVERS THE AREA N OF 
17N W OF 117W. ELY TRADES OF 20 KT ARE ON THE ON THE SOUTHERN 
PERIPHERY OF THE RIDGE. LARGE SWELLS ARE ONCE AGAIN EXPECTED TO 
MOVE INTO THE NW PORTION OF THE AREA WITHIN 48 HOURS.

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