SWOD48
SPC AC 250902
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0402 AM CDT SUN MAY 25 2008
VALID 281200Z - 021200Z
...DISCUSSION...
SEVERE THREAT APPEARS LIMITED DAY 4 /WED MAY 28/...BUT SHOULD
INCREASE DAYS 5 AND 6 AS A SHORT-WAVE TROUGH IS FORECAST TO BEGIN
CRESTING THE CENTRAL U.S. RIDGE DAY 5 /THU. MAY 29/ AND THEN MOVE
INTO THE UPPER MIDWEST DAY 6 /FRI. MAY 30/.
AS THE TROUGH MOVES TOWARD THE NRN HIGH PLAINS DAY 5...INCREASING
SHEAR AND AMPLE INSTABILITY NEAR AND E OF A LEE TROUGH SUGGESTS A
THREAT INTO THE NRN PLAINS. AS THE TROUGH SHIFTS EWD/SEWD DAY 6 --
INTO THE MID MO VALLEY AND THE UPPER MIDWEST ALONG WITH THE
ASSOCIATED SURFACE FRONT...ANOTHER DAY OF ACTIVE SEVERE WEATHER
APPEARS LIKELY -- WITH FAVORABLE SHEAR AND MODERATE INSTABILITY
LIKELY TO EXIST.
..GOSS.. 05/25/2008
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