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Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
1030 AM CST Wed Nov 20 2024

Valid 201630Z - 211200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms appear unlikely through tonight across the
contiguous United States.

...Mid-Atlantic into North Carolina...
Midday water-vapor imagery shows a cyclone over the Upper Midwest
that will move eastward across the Great Lakes through tonight.  A
cold front will advance eastward over these regions.  While
low-level moisture will gradually increase across NC into the
southern Mid-Atlantic by early evening, considerable cloud cover and
relatively meager lapse rates will only result in pockets of weak
instability. Nonetheless, low-topped convection should still form
along or just ahead of the cold front across eastern OH into western
PA and WV by late this afternoon according to the latest guidance. 
This elevated convection is forecast to continue moving eastward
over the southern Mid-Atlantic this evening and overnight.  However,
boundary-layer instability is forecast to remain minimal with
eastward extent, which should limit the storm intensity.

...c*astal Pacific Northwest...
A powerful upper cyclone west of British Columbia will occlude and
gradually move away from the coast.  Low-level warm advection will
support intermittent low-topped convection across coastal portions
of the Pacific Northwest.  With surface dewpoints generally in the
low to mid 40s over land, instability will remain scant---precluding
a severe risk.

..Smith/Flournoy.. 11/20/2024