000
AXPZ20 KNHC 201529
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC TUE MAR 20 2012

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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
ITCZ AXIS FROM 5N114W 4N127W. NO SIGNIFICANT CONVECTION.

...DISCUSSION...
UPPER LEVEL ANTICYCLONIC CIRCULATION IS CENTERED NEAR 29N129W. 
AN UPPER LEVEL TROUGH IS SW OF THE ANTICYCLONE ENTERS THE 
DISCUSSION AREA FROM 26N140W TO 22N131W. WITH THE EXCEPTION OF A 
FEW SHOWERS ALONG 9N FROM 105W-120W STRONG SUBSIDENCE WITH DRY 
AND STABLE AIR AT THE MIDDLE AND UPPER LEVELS IS ACROSS THE AREA 
W OF 120W AND S OF 25N BETWEEN 95W-120W.

AN UPPER LEVEL TROUGH EXTENDS FROM A CYCLONIC CIRCULATION OVER SE
NEW MEXICO ACROSS MEXICO TO 19N102W. MOSTLY ZONAL WLY FLOW IS S 
OF 20N WITH A 200 NM 75-80 KT WIND MAX FROM 120W-90W. 

NLY WINDS TO 20 KT ARE ALONG THE W COAST OF THE BAJA PENINSULA 
GENERALLY N OF 25N E OF 119W. HIGH PRES RIDGE EXTENDS FROM A 1025 
MB HIGH PRES CENTER LOCATED JUST W OF THE DISCUSSION AREA NEAR 
25N141W WITH RIDGE FROM THE HIGH TO 15N108W. BROKEN/OVERCAST 
STRATOCUMULUS CLOUDS ARE WITHIN THE RIDGE N OF 15N W OF 110W. 
ELY TRADES IN THE 20 KT RANGE ARE ALONG THE SOUTHERN PERIPHERY 
OF THE RIDGE FROM 7N-20N W OF 125W. LARGE 8-11 FT NW SWELLS 
ACROSS THE AREA W OF 115W.

SURFACE TROUGH WITH AXIS FROM THE COAST OF COSTA RICA TO 1N105W. 
SCATTERED SHOWERS ARE WITHIN 280 NM SE OF THE TROUGH FROM THE 
COAST OF COSTA RICA TO 5N92W.

$$
DGS