000
AXPZ20 KNHC 180303
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC WED JUN 18 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 
0230 UTC.

...ITCZ...
INTERTROPICAL CONVERGENCE ZONE 07N77W TO 05N85W TO 09N103W TO 
09N113W TO 06N119W 08N129W TO 03N140W. CLUSTERS OF SCATTERED 
MODERATE TO ISOLATED STRONG CONVECTION WITHIN 90 NM OF THE ITCZ 
FROM 103W TO 109W. SCATTERED MODERATE CONVECTION FROM 07N TO 11N 
BETWEEN 113W AND 116W. 

...DISCUSSION...
A SURFACE TROUGH IS EMBEDDED WITHIN THE ITCZ ALONG 14N97W TO 
7N103W BUT IS BENEATH EASTERLY UPPER FLOW KEEPING THE ASSOCIATED 
CONVECTION TO THE W OF THE TROUGH AXIS. A SECOND SURFACE TROUGH 
IS ALSO EMBEDDED WITHIN THE ITCZ FURTHER W ALONG 112W WITH A 
WEAK 1009 MB LOW ALONG THE TROUGH NEAR 9N. THE SURFACE LOW 
REMAINS ILL DEFINED AND COUPLED WITH THE DIFFLUENCE ALOFT IS 
ENHANCING THE CONVECTION ASSOCIATED WITH THE TROUGH. THIS 
LOW/TROUGH IS NOT EXPECTED TO PERSIST BEYOND THU. AN UPPER 
TROUGH IS ALONG 138W AND COVERS THE AREA W OF 120W INTO THE 
TROPICS WHILE A BROAD UPPER HIGH REMAINS ANCHORED OVER WEST 
CENTRAL MEXICO COVERING THE REMAINDER OF THE AREA E OF 120W N 
17N. A STRONG PRESSURE GRADIENT EXISTS BETWEEN AN AREA OF LOW 
PRESSURE OVER THE DESERT SW AND A 1030 MB SURFACE HIGH NEAR 
38N135W PRODUCING GALE FORCE WINDS N OF THE REGION AND WINDS TO 
20 KT ALONG THE VERY N PORTION OF THE AREA. WINDS OF 20 TO 25 KT 
PERSISTS S OF THE EQUATOR PRODUCING SEAS OF 8 TO 10 FT ACROSS 
MOST OF THE S PORTION OF THE AREA. 

$$
WALLACE