000
AXPZ20 KNHC 161501
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC WED APR 16 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 
1500 UTC.

...ITCZ...
ITCZ AXIS IS CENTERED ALONG 02N79W TO 01N85W TO 07N105W TO 
05N130W TO 04N140W. SCATTERED MODERATE WITHIN 60 NM S OF AXIS 
FROM 83W TO 91W. SCATTERED MODERATE TO STRONG FROM 05N TO 10N 
BETWEEN 110W AND 133W.

...DISCUSSION...
CUT-OFF UPPER LOW IS LOCATED OVER THE FAR W PORTION OF THE AREA 
NEAR 25N140W WITH A TROUGH AXIS EXTENDING SWD ALONG 140W TO NEAR 
8N...WITH BROAD SWLY FLOW E OF THE TROUGH TO NEAR 120W. DEEP 
LAYER
TROUGH EXTENDS FROM THE NORTHERN ROCKIES ACROSS ARIZONA INTO THE
CENTRAL BAJA PENINSULA. A WEAK RIDGE SEPARATES THE TWO TROUGHS.
LARGE SCALE RIDGING IS IN PLACE OVER MEXICO AND CENTRAL AMERICA
WITH A MEAN AXIS FROM AN ANTICYCLONIC CIRCULATION CENTERED OVER 
PANAMA THROUGH GUATEMALA INTO CENTRAL MEXICO. MODERATE TO STRONG 
SUBSIDENCE WITH DRY AIR AND MOSTLY CLEAR SKIES IS LOCATED N OF 
THE ITCZ E OF 95W DUE TO AN UPPER HIGH CENTERED OVER PANAMA.
FARTHER N...A PROGRESSIVE UPPER LEVEL SHORTWAVE RIDGE IS LOCATED 
ALONG 97W MOVING ACROSS NW MEXICO. MODERATE/STRONG SUBSIDENCE IS 
ASSOCIATED WITH THE RIDGE AXIS IS N OF 22N E OF 110W.

THE SUBTROPICAL RIDGE IS IN PLACE FROM 32N135W TO 17N111W. 
BROKEN/OVERCAST STRATOCUMULUS CLOUDS COVER THE AREA N OF 14N W 
OF 120W. THE PRES GRADIENT OVER SOUTHERN MEXICO HAS WEAKENED AND 
WINDS IN THE GULF OF TEHUANTEPEC HAVE DECREASED TO BELOW GALE 
FORCE THIS MORNING.

$$
DGS