Severe Storm Outlook Narrative (AC)
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ACUS03 KWNS 200649
SPC AC 200648

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0148 AM CDT Tue Mar 20 2018

Valid 221200Z - 231200Z


Isolated weak thunderstorms are possible Thursday across parts of
the West.

An upper low will pivot northward across the Canadian Maritimes with
the large-scale upper trough shifting off the East Coast. A surface
ridge will extend from the upper Great Lakes to the Gulf of Mexico,
maintaining stable and dry conditions. To the west, an upper trough
will affect the Pacific Northwest, providing cold temperatures aloft
supportive of a few weak thunderstorms across coastal WA and OR.

A southern-stream wave will move across the Great Basin, with a
surface trough extending from western MT across WY and into UT
during the afternoon. Pockets of weak instability along with local
terrain enhancements may support isolated thunderstorms.

..Jewell.. 03/20/2018

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