Severe Storm Outlook Narrative (AC)
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ACUS48 KWNS 210824
SWOD48
SPC AC 210823

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0323 AM CDT Mon Aug 21 2017

Valid 241200Z - 291200Z

...DISCUSSION...
A significant upper trough is forecast to progress inland of the
British Columbia/Pacific Northwest coast Thursday through Thursday
night.  However, models indicate that the mid-level cold core may
remain largely north of the international border.  Although some
strengthening of westerly mid/upper flow is forecast across the
northern U.S. intermountain region/Rockies, it is unclear whether
this will be enough to support more than low severe probabilities,
at best, given the lack of stronger expected destabilization.

Into the weekend and early next week, models continue to indicate
that large-scale mid-level ridging will generally build across much
of the West, with downstream westerlies split across central and
eastern North America.  Potential short wave developments within
this latter regime remain at least somewhat unclear, but there is
little apparent at this time to suggest anything more than
relatively localized and/or marginal severe weather potential.

..Kerr.. 08/21/2017



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