SPC 1200Z Day 1 Outlook

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
1147 PM CST Mon Nov 30 2020

Valid 011200Z - 021200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not expected across the United States
today.

...Discussion...
As a deepening upper low moves slowly north-northeastward across the
Lower Great Lakes into the Ottawa Valley, a short-wave trough in its
wake -- digging south-southeastward across the Rockies -- will
evolve into a second closed low through the second half of the
period.

At the surface, an occluded low is progged to retrograde
northwestward into/across southwestern Quebec, while the trailing
cold front advances across the western Atlantic.  Meanwhile, a weak
low is forecast to shift across the southern Plains, in response to
the evolving western upper low.  High pressure will prevail
elsewhere.

Thunderstorm activity is forecast to be minimal across the CONUS
today; a few lightning flashes will be possible during the first
half of the period over eastern Maine, near the occluded surface
system's triple point.  Showers and possibly an elevated
thunderstorm or two may also evolve late in the period over coastal
portions of Texas, as low-level theta-e advection increases atop a
stable boundary layer.  In both areas, severe weather is not
expected.

..Goss/Moore.. 12/01/2020

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