SPC AC 200730
Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0130 AM CST Tue Feb 20 2018
Valid 221200Z - 231200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
Showers and a few thunderstorms are expected from Texas through a
portion of the Tennessee and Ohio Valley Thursday.
...Texas into the lower Mississippi, Tennessee and Ohio Valleys...
Upper pattern will remain characterized by a synoptic trough over
the western half of the U.S. on Thursday. A low-amplitude shortwave
trough initially over the southern Rockies will eject northeast
through the Central Plains and middle MS Valley regions.
Quasi-stationary front will reside from the Middle Atlantic through
the TN and lower MS Valleys to south TX Thursday morning. This
boundary may retreat some distance northwest during the period, but
in general an ana-frontal southwesterly flow regime will persist
with episodes of showers and a few thunderstorms occurring primarily
within zone of isentropic ascent on the cool side of the front. The
elevated nature of the convection and weak instability should
preclude a threat for severe storms.
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