000
AXPZ20 KNHC 280308
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC THU AUG 28 2008

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0315 UTC.

...TROPICAL WAVES...

TROPICAL WAVE IS OVER PANAMA ALONG 83W N OF 3N MOVING W 15 KT. 
THIS WAVE IS LOW AMPLITUDE AND HAS MOST OF ITS CONVECTION W OF 
THE WAVE AXIS. SCATTERED MODERATE TO ISOLATED STRONG CONVECTION 
IS FROM 07N TO 11N BETWEEN 83W AND 86W. 

TROPICAL WAVE IS ALONG 98W N OF 07N MOVING W 15 KT. SCATTERED 
MODERATE TO ISOLATED STRONG CONVECTION IS OVER S MEXICO FROM 
15N-19N BETWEEN 93W AND 98W. MORE CONVECTION IS ALONG THE ITCZ 
WITH SCATTERED MODERATE CONVECTION FROM 07N TO 11N BETWEEN 94W 
AND 101W.  

...ITCZ...

ITCZ AXIS IS CENTERED ALONG 13N85W 11N100W 11N110W 14N118W 
10N138W 09N140W. SCATTERED MODERATE CONVECTION IS FROM 07N TO 
11N BETWEEN 87W AND 101W. SCATTERED MODERATE CONVECTION IS FROM 
05N TO 08N BETWEEN 102W AND 105W...FROM 05N TO07N BETWEEN 111W 
AND 117W...AND FROM 8N TO 11N BETWEEN 127W AND 130W.       

...DISCUSSION...

N OF 20N...
THE REMNANTS OF JULIO HAVE DISSIPATED OVER THE GULF OF 
CALIFORNIA AND NW MEXICO...THOUGH SOME OF ITS ASSOCIATED 
MOISTURE IS AFFECTING NW MEXICO...NEW MEXICO AND ARIZONA. 
SCATTERED SHOWERS AND TSTMS ARE NEAR THE COAST OF MEXICO FROM 
20N-23N E OF 108W ENHANCED BY UPPER DIFFLUENCE AND LOW-LEVEL 
TROUGHING OVER MEXICO. A NEARLY STATIONARY UPPER HIGH IS 
CENTERED NEAR 24N116W. AT THE SFC...A 1026 MB HIGH CENTERED NEAR 
37N140W CONTROLS THE PATTERN PRODUCING MODERATE NE TRADES. N 
WINDS ARE TO GALE FORCE N OF THE ZONE OFF THE N CALIFORNIA COAST 
DUE TO THE TIGHT PRESSURE GRADIENT BETWEEN THE HIGH AND LOW PRES 
OVER THE DESERT SW CONUS. WHILE THE CORE OF THE STRONGEST WINDS 
ARE N OF THE AREA... ASSOCIATED N SWELL IS PROPAGATING N OF 27N 
BETWEEN 120W AND 130W.

S OF 20N...
SWIFT ELY MID AND UPPER FLOW LIES OVER THE REGION E OF 115W ON 
THE S PERIPHERY OF A QUASI-STATIONARY UPPER HIGH CENTERED JUST W 
OF THE S PORTION OF THE GULF OF CALIFORNIA. THIS FLOW IS 
ADVECTING A CONSIDERABLE AMOUNT OF MOISTURE OVER THE TROPICS... 
THOUGH SIGNIFICANT CONVECTION IS FAIRLY LIMITED OUTSIDE OF THE 
TROPICAL WAVE ALONG 98W. A WEAK 1010 MB SFC LOW IS ANALYZED JUST 
N OF THE ITCZ NEAR 17N117W WITH NO SIGNIFICANT CONVECTION. THE 
SW SWELL EVENT WITH WAVE PERIODS OF 16-18 SECONDS HAVE REACHED 
THE COAST OF CENTRAL AMERICA/MEXICO AND SHOULD SUBSIDE TOMORROW 
AND FRI.   

$$
FORMOSA