Severe Storm Outlook Narrative (AC)
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ACUS03 KWNS 210746
SPC AC 210745

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0145 AM CST Wed Feb 21 2018

Valid 231200Z - 241200Z


Showers and a few thunderstorms are expected from a portion of the
Southern Plains to the lower and middle Mississippi and Ohio Valley
regions Friday.


Upper pattern will remain characterized by a synoptic trough over
the western U.S. and a downstream low-amplitude ridge in the east.
Weak vorticity maxima embedded within the broad southwesterly flow
regime will interact with baroclinic zone that should initially
extend from south TX into the OH Valley. Thunderstorms will likely
remain confined to zone of isentropic ascent and weak instability on
cool side of this front. Deep convection will struggle to develop in
warm sector due to weak forcing and a very marginal thermodynamic
environment including warming temperatures aloft.

..Dial.. 02/21/2018

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