000
AXPZ20 KNHC 170916
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC WED MAR 17 2010

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 6N78W 7N105W 4N115W 4N140W. SCATTERED MODERATE 
CONVECTION WITHIN 100 NM S OF AXIS FROM 133W-136W.

...DISCUSSION...
A BROAD UPPER LEVEL TROUGH IS OVER THE FAR NW PORTION OF THE 
DISCUSSION AREA N OF 25N W OF 125W. A 100-115 KT JETSTREAM IS S 
OF THE TROUGH AND ENTERS THE AREA AT 26N140W TO 30N120W. 
DOWNSTREAM UPPER LEVEL RIDGE COVERS THE AREA N OF 20N E OF 120W. 
STRONG SUBSIDENCE WITH DRY STABLE AIR AT THE MIDDLE AND UPPER 
LEVELS OF THE ATMOSPHERE IS WITHIN THE RIDGE. ANOTHER UPPER 
LEVEL TROUGH EXTENDS FROM A CYCLONIC CIRCULATION OVER EASTERN 
TEXAS ACROSS THE WESTERN GULF OF MEXICO TO THE GULF OF 
TEHUANTEPEC. SW FLOW SE AND S OF THE TROUGH IS ADVECTING 
ABUNDANT TROPICAL MOISTURE ALOFT ACROSS SOUTHERN MEXICO. IN THE 
DEEP TROPICS...AN ANTICYCLONIC CIRCULATION IS CENTERED NEAR 
7N89W WITH A RIDGE EXTENDING FROM THE ANTICYCLONE W TO 07N115W 
AND NE INTO NICARAGUA. MODERATE TO STRONG SUBSIDENCE IS FOUND 
OVER CENTRAL AMERICA N OF THE RIDGE AXIS.

SURFACE TROUGH EXTENDS FROM 32N127W TO 26N137W. NE WINDS 20-25 
KT ARE W OF THE TROUGH WITH WITH LARGE NW SWELLS UP 17 FT.
THE TROUGH IS FORECAST TO DISSIPATE LATER THIS MORNING.
A COUPLE OF TROUGHS ARE ANALYZED ALONG THE ITCZ. ONE FROM 
8N-1N ALONG 107W. SHOWERS ARE ALONG THE TROUGH S OF 4N. 
ANOTHER TROUGH EXTENDS FROM 8N130W TO 1N131W. NO SIGNIFICANT 
WEATHER ASSOCIATED WITH THE TROUGH.

GALE FORCE WINDS ARE EXPECTED TO START WITHIN THE NEXT FEW HOURS 
IN THE GULF OF TEHUANTEPEC AS STRONG HIGH PRES BUILDS OVER THE 
WESTERN GULF OF MEXICO AND TIGHTENS THE PRESSURE GRADIENT OVER 
SOUTHERN MEXICO. GALES ARE EXPECTED TO PERSIST THROUGH THU.
 
FOR ADDITIONAL INFORMATION PLEASE VISIT 
HTTP://WWW.HURRICANES.GOV/MARINE

$$
DGS