Severe Storm Outlook Narrative (AC)
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ACUS02 KWNS 130601
SPC AC 130600

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1200 AM CST Wed Dec 13 2017

Valid 141200Z - 151200Z


Thunderstorms are not expected across the contiguous states on
Thursday and Thursday night.

A couple of Pacific shortwave troughs expected to move equatorward
into the Four Corners/southern Great Basin and northern High Plains
today will proceed southward Thursday and Thursday night.  These
troughs are expected to phase this forecast period, resulting in a
positively tiled longwave trough extending from northern Mexico and
the southern Plains to the Great Lakes.  A cold front attendant to a
progressive Day 1 shortwave trough moving through the Midwest, OH
Valley to the mid Atlantic states should extend from the central and
southern Appalachians through the mid South to central TX at 12Z
Thursday.  This boundary will continue to advance south and into the
western and northern Gulf of Mexico Thursday night.

Although moistening is expected across the Gulf Basin ahead of the
cold front, poor lapse rates suggest buoyancy will not become deep
enough for charge separation as the front moves into the western and
northern Gulf Thursday night.  Elsewhere, a dry, stable environment
will preclude convective development along the cold front.

..Peters.. 12/13/2017

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