SPC AC 260730

   Day 3 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0230 AM CDT Wed Aug 26 2020

   Valid 281200Z - 291200Z

   ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM A PORTION OF
   THE MIDWEST INTO THE GREAT LAKES AND OHIO VALLEY...

   ...SUMMARY...
   Strong to severe storms are possible Friday from a portion of the
   Mississippi Valley, the Great Lakes and Ohio Valley. Other strong to
   severe storms may occur over the central Plains.

   ...Middle Mississippi Valley through the Great Lakes and Ohio
   Valley...

   An east-west quasi-stationary front will stretch across the Great
   Lakes into southern portions of the Northeast States early Friday.
   Elevated storms should be in progress within zone of isentropic
   ascent north of this boundary. Rich low-level moisture with upper
   60s to low 70s F dewpoints will reside in the warm sector farther
   south. The atmosphere will likely become moderately to strongly
   unstable as the boundary layer warms during the afternoon with
   MLCAPE from 2000-3000 J/kg possible. A southeast-advancing cold
   front will accompany a progressive northern-stream trough through
   the upper MS Valley during the afternoon, continuing into the
   Midwest during the evening. Additional storms will likely develop as
   the front interacts with the destabilizing boundary layer from
   southern WI into IA and this activity will subsequently spread
   southeast. Vertical wind profiles will strengthen as the upper
   trough advances east-southeast, and potential will exist for
   organized storms including lines with bowing segments and embedded
   supercells. Damaging wind and hail should be the main threats. 

   ...Central Plains...

   While more substantial thunderstorm initiation along the cold front
   remains uncertain during the afternoon, a greater signal exists in
   the upslope region of CO where storms will likely develop over the
   higher terrain by late afternoon. This activity will spread east
   into the central High Plains posing a risk for a few damaging wind
   gusts and hail. Additional storms may develop overnight across KS,
   mainly north of the front, and some of this activity may become
   capable of producing hail and locally strong wind gusts. This region
   will continue to be monitored for a possible SLGT risk in later
   updates. 

   ...Lower Mississippi and Tennessee Valleys...

   The kinematic environment associated with the remnants of Laura
   should remain favorable for a few tornadoes during the afternoon
   from a portion of the lower MS Valley into the TN Valley as the
   system begins to turn more northeasterly and easterly.

   ..Dial.. 08/26/2020

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   NOTE: THE NEXT DAY 3 OUTLOOK IS SCHEDULED BY 0730Z