Severe Storm Outlook Narrative (AC)
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ACUS48 KWNS 210930
SPC AC 210928

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0328 AM CST Tue Feb 21 2017

Valid 241200Z - 011200Z

The concern for severe weather during the Friday-Tuesday period will
likely concentrate on Friday (Day 4) across the OH Valley and
southern Great Lakes regions.  A strong mid-level speed maximum is
forecast to strengthen and move over the aforementioned regions on
Friday.  There remains considerable model spread in the timing and
placement of the surface low track.  To the south of a warm front
and east of an eastward-sweeping cold front, a marginally buoyant
warm sector is forecast to develop and result in a low CAPE/high
shear environment.  The primary threat with the more intense
thunderstorms that develop will be damaging winds.  By Saturday (Day
5), the cold front will move east across the lower Great Lakes and
Mid-Atlantic states with surface high pressure building over the MS
Valley and Gulf Coast states.  Models indicate modifying Gulf
moisture may return northward on Monday and Tuesday (Days 7-8) in
response to lee troughing as another in a series of mid-level
troughs develop over the western states.

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