Severe Storm Outlook Narrative (AC)
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ACUS48 KWNS 270843
SPC AC 270842

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0342 AM CDT Thu Apr 27 2017

Valid 301200Z - 051200Z

Models remain generally consistent with eastward progression of an
upper trough through the southern Plains and lower MS Valley day 4
and into the OH Valley and Great Lakes day 5.

Sunday (Day 4) - As the upper trough and its associated cold front
progress eastward, the severe-storm threat will spread into the TN
Valley and southeast states where favorable vertical shear will
coexist with a moderately unstable warm sector downstream from an
ongoing MCS.

Monday (Day 5) - Some severe threat will persist from a portion of
the OH Valley into the east and Southeast States as the cyclone
occludes over the Great Lakes, but trailing front continues toward
the Atlantic seaboard. While the warm sector in much of this region
will remain under the influence of strong vertical shear, it remains
uncertain whether instability will be sufficient for a more robust
severe event.

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