000
AXPZ20 KNHC 020917
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SUN AUG 02 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.

...TROPICAL WAVES...
TROPICAL WAVE N OF 3N TO THE COAST OF HONDURAS AND NICARAGUA 
ALONG 87W/88W MOVING W 10-15 KT. ISOLATED SHOWERS ARE ALONG 
THE WAVE.

TROPICAL WAVE FROM 6N-15N ALONG 113W MOVING W 15 KT. SCATTERED 
MODERATE TO STRONG CONVECTION ARE MAINLY ALONG AND S OF THE 
ITCZ.

TROPICAL WAVE FROM 10N-20N ALONG 129W/130W MOVING W 10-15 KT.  
ONLY ISOLATED TSTMS ALONG THE WAVE.

...ITCZ...
AXIS ALONG 8N78W 10N90W 11N129W 10N140W. SCATTERED MODERATE TO 
STRONG CONVECTION WITHIN 150 NM S OF AXIS FROM 102W-112W AND 
FROM 7N-16N BETWEEN 115W-120W. SCATTERED MODERATE ISOLATED 
STRONG CONVECTION FROM 7N-12N BETWEEN 136W-140W.

...DISCUSSION...
AN UPPER LEVEL TROUGH EXTENDS FROM A CYCLONIC CIRCULATION N OF 
THE AREA TO 32N130W 25N131W. ASSOCIATED SURFACE TROUGH WITH AXIS 
FROM 32N125W TO 27N130W. NO SIGNIFICANT WEATHER ASSOCIATED WITH 
THE TROUGH. A 75-90 KT JETSTREAM IS MOVING ACROSS THE BASE OF 
THE TROUGH FROM 31N138W TO 30N129W WHERE WINDS DECREASE TO 40-50 
KT. SW OF THE TROUGH IS AN UPPER LEVEL ANTICYCLONIC CIRCULATION 
CENTERED NEAR 20N138W WITH RIDGE FROM THE CIRCULATION TO 26N130W
23N125W. UPPER LEVEL MOISTURE FROM CENTRAL PACIFIC TROPICAL 
STORM LANA IS MOVING TO THE N OF THE ANTICYCLONIC CIRCULATION
FROM 22N-28N W OF 132W. OTHERWISE MODERATE TO STRONG SUBSIDENCE 
WITH DRY STABLE AIR AT THE MIDDLE AND UPPER LEVELS OF THE 
ATMOSPHERE COVERS THE AREA N OF 15N W OF 121W.

AN UPPER LEVEL CYCLONIC CIRCULATION IN THE DEEP TROPICS IS 
CENTERED NEAR 14N122W. UPPER LEVEL DIFFLUENT FLOW BETWEEN
THE CYCLONIC CIRCULATION AND A DOWNSTREAM RIDGE IS ENHANCING
CONVECTIVE ACTIVITY ALONG ITCZ AND TROPICAL WAVE FROM 100W-120W.

A LARGE UPPER LEVEL ANTICYCLONIC CIRCULATION IS OVER NORTHERN 
MEXICO NEAR NEAR THE S TEXAS BORDER AT 28N100W. CLUSTERS TO 
TSTMS ARE OVER NW MEXICO AND SLOWLY DISSIPATING. AN UPPER RIDGE 
EXTENDS FROM THE ANTICYCLONIC CIRCULATION SW TO TO THE TIP OF 
BAJA CALIFORNIA TO 16N115W. UPPER LEVEL DIFFLUENT FLOW IS
ENHANCING CONVECTION ALONG THE COASTS OF GUATEMALA AND EL
SALVADOR.

SURFACE RIDGE WITH AXIS FROM 27N122W TO 16N108W. BROKEN TO 
OVERCAST STRATOCUMULUS CLOUDS BLANKET THE AREA N OF 20N W OF 
115W. SURFACE TROUGH IS ANALYZED ALONG THE ITCZ FROM 8N100W TO 
14N102W. SCATTERED MODERATE CONVECTION IS WITHIN 100 NM W OF THE 
WAVE N OF 10N. ANOTHER TROPICAL WAVE IS ANALYZED ALONG THE ITCZ
OVER THE FAR W PORTION OF THE AREA FROM 15N138W TO 10N140W 
SCATTERED SHOWERS AND TSTMS ARE ALONG THE TROUGH.

$$
DGS