SWOD48
SPC AC 160838
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0338 AM CDT TUE SEP 16 2008
VALID 191200Z - 241200Z
...DISCUSSION...
PRIMARY WEATHER STORY WILL REVOLVE AROUND AN APCHG UPR LOW ACROSS
THE PAC NW IN THE LATE WEEK/WEEKEND TIME FRAME. 00Z ECMWF/GFS/GEFS
ENSEMBLES AND NAEFS PORTRAY CONSIDERABLE SPREAD WITH THE
DEPTH...TIMING AND TRACK OF THIS FEATURE AS IT MOVES ACROSS THE NWRN
HALF OF THE COUNTRY. IT IS DOUBTFUL THAT MEANINGFUL RETURN
FLOW/MOISTURE ADVECTION WILL OCCUR OVER THE PLNS THROUGH THE
EXTENDED PD. BUT...GIVEN POOR MODEL PERFORMANCE...THE MEDIUM RANGE
SVR FCST WILL REMAIN IN THE LOW PREDICTABILITY REALM.
..RACY.. 09/16/2008
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