SWOD48
SPC AC 180735
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0235 AM CDT TUE SEP 18 2007
VALID 211200Z - 261200Z
..DISCUSSION...
LATEST MEDIUM RANGE GUIDANCE IS RELATIVELY CONSISTENT IN INDICATING
THAT SHORT WAVE TROUGH OVER S-CNTRL CANADA AND THE N-CNTRL TIER OF
STATES ON FRI/DAY 4 WILL TRANSLATE RAPIDLY EWD INTO ONTARIO BY
SAT/DAY 5. THE POTENTIAL FOR A FEW SEVERE STORMS WILL EXIST ALONG
SYSTEM COLD FRONT PUSHING EWD THROUGH THE UPPER GREAT LAKES ON DAY
4. THIS THREAT APPEARS TOO MARGINAL TO DELINEATE AS A REGIONAL
SEVERE WEATHER THREAT.
THOUGH SLIGHT DIFFERENCES EXIST...THESE MODEL DATA SUGGEST THAT WRN
U.S. CUT OFF LOW WILL OPEN AND LIFT NEWD IN MULTIPLE PIECES THROUGH
THE NRN/CNTRL PLAINS INTO GREAT LAKES REGION SUN/DAY6 - TUE/DAY 8.
THE DEGREE OF AIR MASS INSTABILITY PRECEEDING SYSTEM COLD FRONT
REMAINS IN QUESTION...THEREFORE NO AREAS WILL BE INCLUDED.
.MEAD.. 09/18/2007
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