000
AXPZ20 KNHC 172123
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC TUE JUN 17 2008

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

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

...ITCZ...
INTERTROPICAL CONVERGENCE ZONE 07N77W TO 07N87W TO 11N98W TO 
09N106W TO 11N111W TO 09N123W TO 06N140W. SCATTERED MODERATE TO 
STRONG CONVECTION FROM 07N TO 10N BETWEEN 110W AND 114W. 
CLUSTERS OF SCATTERED MODERATE ISOLATED STRONG CONVECTION FROM 
06N TO 14N BETWEEN 99W AND 109W. CLUSTERS OF SCATTERED MODERATE 
CONVECTION FROM 04N TO 10N BETWEEN 81W AND 93W...FROM 03N TO 11N 
BETWEEN 126W AND 135W. 

...DISCUSSION...
A SURFACE TROUGH IS EMBEDDED WITHIN THE ITCZ ALONG 13N99W TO 
7N100W 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 111W WITH A 
WEAK 1009 MB LOW ALONG THE TROUGH NEAR 9N. AS OF YET THE SURFACE 
LOW IS NOT WELL DEFINED AS THE MID LEVEL LOW IS BUT 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 140W AND COVERS THE AREA W OF 120W 
INTO THE TROPICS WHILE A BROAD UPPER HIGH REMAINS ANCHORED OVER 
CENTRAL MEXICO COVERING THE REMAINDER OF THE AREA E OF 120W N 
16N. A STRONG PRESSURE GRADIENT EXISTS BETWEEN AN AREA OF LOW 
PRESSURE OVER THE DESERT SW AND A 1029 MB SURFACE HIGH NEAR 
40N137W PRODUCING GALE FORCE WINDS N OF THE REGION AND WINDS TO 
20 KT ALONG THE 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