Severe Storm Outlook Narrative (AC)
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ACUS48 KWNS 180843
SPC AC 180841

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0341 AM CDT Sun Mar 18 2018

Valid 211200Z - 261200Z

A stable pattern will exist on Day 4 and 5 due to an expansive upper
trough across eastern North America and high pressure over the
eastern states and Gulf of Mexico. Upper troughiness over the
western states will shift into central parts of the CONUS during the
D6-D8 period as an upper ridge over the Plains gets shunted east.

On Friday/D6, the first shortwave trough will move into the central
Plains, along with a surface low. However, meager moisture and
instability will not favor a severe weather threat, though
thunderstorms are possible across parts of the Midwest Friday night
near a warm front.

Beyond D6, a second, larger upper trough is likely to move slowly
across the Rockies and eventually into the Plains, and by this time
moisture and instability should be greater, supporting some severe
potential. However, predictability is low at this time.

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