SPC 1300Z Day 1 Outlook

Day 1 Outlook Image

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
0727 AM CDT Tue Oct 13 2020

Valid 131300Z - 141200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not expected across the contiguous United
States through tonight.

...Synopsis...
Fast/low-amplitude flow aloft is progged across roughly the northern
half of the U.S. today, as several embedded short-wave troughs will
progress rapidly eastward across the northern tier of the country. 

At the surface, a weakening cold front -- trailing from a deeply
occluded low over the northern Manitoba vicinity -- will continue
sweeping eastward across the eastern seaboard.  This front will
eventually overtake a weak low just off the Mid Atlantic coast, with
the low then moving northward along the front across coastal New
England, as the boundary gradually works offshore.

Farther west, a weak low is forecast to shift east-southeastward out
of the Canadian Rockies and across the northern Intermountain
region, in conjunction with one of the aforementioned upper
short-wave troughs.  

As this northwestern U.S. low -- and associated upper system --
advances, showers and possibly a few thunderstorms will occur --
from Washington State into Montana.  Showers and a few embedded
thunderstorms are also expected over portions of the Northeast, in
the vicinity of the advancing cold front/frontal low.

Elsewhere, appreciable lightning is not expected.

..Goss.. 10/13/2020

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