SPC AC 070820
Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0220 AM CST Wed Dec 07 2022
Valid 091200Z - 101200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
Severe weather is not expected across the U.S. on Friday.
Some amplification of the flow field aloft is expected Friday, as
long-wave troughing continues to evolve over the West.
Specifically, an initial trough that is progged to move onshore
Thursday, is expected to shift northeastward across the interior
West, while a second wave digs south-southeastward out of the Gulf
of Alaska toward the West Coast. Meanwhile, as the
longer-wavelength troughing evolves, downstream over the Gulf of
Mexico will be maintained across the Southeast/Mid-South in
At the surface, the west-to-east baroclinic zone lying from the
southern Plains to the southern Appalachians will shift southward
into the Southeast with time, but should move little over the
southern Plains as a weak frontal wave evolves over Texas.
Showers and potentially a few lightning flashes will occur during
initial stages of the period in the vicinity of the front over
Tennessee and into the southern Appalachians.
Overnight, elevated convection may evolve over the Oklahoma/north
Texas vicinity, as low-level warm advection increases somewhat ahead
of the evolving western trough.
Finally, convection -- with a few embedded lightning flashes -- may
affect th southern Oregon/northern California Coasts toward the end
of the period, as the digging eastern Pacific short-wave trough
In all areas, severe weather is not expected.
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