Severe Storm Outlook Narrative (AC)
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ACUS02 KWNS 120549
SPC AC 120548

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1148 PM CST Mon Dec 11 2017

Valid 131200Z - 141200Z


Thunderstorms are not forecast across the contiguous states on

An upper ridge will be maintained across the western U.S. Wednesday,
with its mean position centered from the west coast to British
Columbia.  Farther east, a midlevel cyclone is expected to deepen as
it tracks north/northeast across New England into southern Quebec,
while a series of upstream shortwave troughs move south/southeast in
lee of the Rockies, reinforcing the large-scale eastern U.S. trough.

Weak south/southwesterly low-level winds should develop across TX
through the central Gulf coast and southeast states this forecast
period ahead of the next cold front approaching this region
Wednesday night.  However, greater moisture available for stronger
destabilization will remain shunted well south of the U.S. mainland.
Aside from some offshore lightning being possible east of the middle
and northern Atlantic states, given shallow convection deep enough
for charge separation, a stable environment over land will inhibit
thunderstorm formation elsewhere Wednesday into Wednesday night.

..Peters.. 12/12/2017

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