000
AXPZ20 KNHC 160922
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC WED APR 16 2008

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 
0800 UTC.

...ITCZ...

ITCZ AXIS IS CENTERED ALONG 03N77W TO 01N85W TO 07N102W TO 
05N115W TO 06N128W TO 03N140W. SCATTERED MODERATE CONVECTION 
WITHIN 60 NM S OF THE AXIS BETWEEN 83W-87W AND FROM 07N-11N 
BETWEEN 96W-101W. SCATTERED MODERATE/ISOLATED STRONG CONVECTION 
FROM 07N-12N BETWEEN 111W-121W AND FROM 04N-11N BETWEEN 
121W-136W. 

...DISCUSSION...

W OF 120W...
A CUT-OFF UPPER LOW IS LOCATED JUST W OF THE AREA NEAR 25N141W 
WITH A TROUGH AXIS EXTENDING SWD ALONG 141W TO NEAR 8N...AND 
BROAD SOUTHWESTERLY FLOW LYING TO THE E TO NEAR 120W. THE UPPER 
LOW WAS ATTACHED TO ANOTHER TROUGH AXIS WHICH EXTENDS FROM OVER 
SOUTHERN CALIFORNIA TO 30N125W...BUT THE BULK OF THE TROUGHING 
LIES WELL TO THE N ACROSS THE WESTERN UNITED STATES. IN THE 
LOW-LEVELS...THE SUBTROPICAL RIDGE IS IN PLACE FROM 30N134W TO 
20N120W WITH MODERATE 20-25 KT TRADES LYING SW OF THE AXIS...AND 
LARGE 8-12 FT SWELLS MOVING INTO THE NW PART OF THE REGION. A 
BROKEN STRATOCUMULUS FIELD LIES N OF 14N W OF 120W WHILE SKIES 
ARE CLEARING NEAR THE BAJA CALIFORNIA COAST.

E OF 120W...
LARGE-SCALE RIDGING IS IN PLACE OFF THE SW COAST OF MEXICO WITH 
A MEAN AXIS STRETCHING FROM CENTRAL AMERICA NEAR 10N85W TO NEAR 
17N120W. DRIER WEATHER IS LOCATED E OF 95W DUE TO AN UPPER HIGH 
CENTERED OVER NICARAGUA AND COSTA RICA...AND AN ASSOCIATED PATCH 
OF MODERATE/STRONG SUBSIDENCE OVER SRN CENTRAL AMERICA. FARTHER 
N...A PROGRESSIVE UPPER LEVEL SHORTWAVE RIDGE IS LOCATED ALONG 
105W MOVING ACROSS NW MEXICO...TRANSITIONING INTO A DEEP-LAYERED 
TROUGH OVER THE GULF OF MEXICO. MODERATE/STRONG SUBSIDENCE IS 
ASSOCIATED WITH THE RIDGE AXIS AND IS SPREADING ACROSS NORTHERN 
MEXICO.

GALE CONDITIONS ARE OCCURRING OVER THE GULF OF TEHUANTEPEC DUE 
TO HIGH PRES CENTERED OVER THE LOWER MISSISSIPPI VALLEY...WITH 
WINDS CURRENTLY AS HIGH AS 35 KT. THE HIGH IS EXPECTED TO SHIFT 
SLOWLY E OVER THE NEXT DAY AND WINDS WILL DROP BELOW GALE FORCE 
LATER THIS MORNING...THEN BELOW 20 KT BY THU NIGHT. WINDS ARE 
CURRENTLY 20 KT OVER THE GULF OF PAPAGAYO AND SHOULD REMAIN 
STEADY OVER THE NEXT 48 HRS.

$$
WALLACE