SWOD48
SPC AC 260842
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0242 AM CST TUE FEB 26 2008
VALID 291200Z - 051200Z
..DISCUSSION...
TROUGHING NOW EVIDENT OVER NWRN PACIFIC SHOULD DIG SEWD FROM PACIFIC
NW TO GREAT PLAINS AND SRN ROCKIES DURING DAYS 5-6...1-3 MAR...THEN
SEWD OR ESEWD ACROSS LOWER-MID MS VALLEY THEREAFTER. OPERATIONAL
SPECTRAL/ECMWF REPRESENT NEARLY FASTEST/SLOWEST EXTREMES
RESPECTIVELY WITH SEWD DIGGING/AMPLIFICATION OF UPPER TROUGH...WITH
MOST MREF MEMBERS PORTENDING VARIOUS INTERMEDIATE SOLUTIONS.
UNCERTAINTIES ABOUT THESE TIMING/AMPLITUDE DIFFERENCES...AND
ASSOCIATED LOW LEVEL MASS FIELD RESPONSES...PRECLUDE CATEGORICAL
OUTLOOK ATTM. HOWEVER...CONCERN IS INCREASING THAT SOME PORTION OF
SERN CONUS MAY EXPERIENCE SVR EPISODE AROUND MON-TUE OF NEXT
WEEK...GIVEN POSSIBILITY THAT SEVERAL PRECEDING DAYS OF AIR MASS
MODIFICATION OVER GULF WOULD YIELD SUFFICIENT LOW LEVEL MOISTURE.
.EDWARDS.. 02/26/2008
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