Severe Storm Outlook Narrative (AC)
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ACUS01 KWNS 171955
SWODY1
SPC AC 171953

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0153 PM CST Sat Feb 17 2018

Valid 172000Z - 181200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
A couple of lightning strikes may occur across the south-central
United States through early afternoon and overnight across the
coastal areas of the Pacific Northwest. Otherwise, thunderstorms are
not expected.

...Discussion...
No change is needed to the previous forecast.

..Smith.. 02/17/2018

.PREV DISCUSSION... /ISSUED 1001 AM CST Sat Feb 17 2018/

...Discussion...
Decreasing instability, weakening low-level convergence, and the
departure of a subtle southern-stream shortwave trough will lead to
a diminished thunderstorm threat across the south-central United
States this afternoon. Although a lightning strike or two may occur,
the threat is too limited for delineation.

Elsewhere, as the core of the midlevel wind maximum moves south of
the Pacific Northwest overnight, cold midlevel temperatures will
steepen low-to-midlevel-lapse rates sufficiently to promote a few
lightning strikes across coastal areas.

$$



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