SPC 0700Z Day 2 Outlook

Day 2 Outlook Image

Day 2 Convective Outlook  
NWS Storm Prediction Center Norman OK
1231 AM CST Wed Jan 20 2021

Valid 211200Z - 221200Z


Severe weather is not expected across the U.S. on Thursday.

While fast westerly/west-northwesterly flow will prevail across most
of the U.S. this period, three features of note embedded therein
will affect portions of the country.

The first will be a clipper-type system moving across the Great
Lakes/Ohio Valley region, and later the Northeast.  The second will
be a trough -- initially just off the coast of western Canada --
that will dig south-southeastward with time into the Pacific
Northwest.  Finally, a weakening upper low/short-wave trough is
progged to move quickly across the southwestern quarter of the

At the surface, a southern Canada low and trailing front -- i.e. the
aforementioned clipper-type system -- will move across the Great
Lakes/Ohio Valley/Northeast, and this will be the primary surface
synoptic-scale feature affecting the U.S. Thursday.

While much of the country will remain dry/stable, showers will move
across the southwestern quarter of the country in conjunction with
the fast-moving -- though weakening -- upper system.  Embedded
within the shower activity, a few lightning flashes will likely
occur -- particularly during the first half of the period from
southern Arizona to Far West Texas.  Elsewhere, thunderstorms are
not expected.

..Goss.. 01/20/2021

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