SWOD48
SPC AC 170847
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0347 AM CDT THU MAY 17 2007
VALID 201200Z - 251200Z
..THERE IS A THREAT FOR SEVERE THUNDERSTORMS ACROSS MUCH OF THE
NORTHERN HIGH PLAINS ON DAY4/MAY 20/...
..THERE IS A THREAT FOR SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE
NORTHERN/CENTRAL PLAINS AND UPPER MISSISSIPPI VALLEY ON DAY5/MAY
21/...
..DISCUSSION...
17/00Z MODEL DATA CONTINUES TO SUGGEST STRONG UPPER TROUGH WILL
SHIFT ACROSS THE NRN/CNTRL ROCKIES INTO THE HIGH PLAINS EARLY NEXT
WEEK. STRENGTHENING SHEAR PROFILES...ALONG WITH A TIGHTENING
BAROCLINIC ZONE ACROSS THE NRN PLAINS APPEAR MORE THAN ADEQUATE FOR
ORGANIZED SEVERE STORMS. AS LLJ STRENGTHENS OVER THE MS VALLEY IN
RESPONSE TO THIS FEATURE STRONG CONVECTION WILL SPREAD DOWNSTREAM
OFF THE HIGH PLAINS INTO PORTIONS OF NEB/SD/ND INTO MN BY MONDAY THE
21ST.
.DARROW.. 05/17/2007
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