Severe Storm Outlook Narrative (AC)
Issued by NWS
ACUS01 KWNS 240043
SPC AC 240041
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0641 PM CST Mon Jan 23 2017
Valid 240100Z - 241200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
A few thunderstorms will persist this evening, mainly over
California into western Arizona, but overall trend should be for
activity to decrease.
...California through western Arizona...
Steep lapse rates associated with cold air aloft (-25 to -30C at
500mb) within a large upper low circulation has contributed to weak
instability in this region. Forcing for ascent accompanying a series
of vorticity maxima embedded within the upper low will continue to
promote scattered showers and a few thunderstorms this evening.
Given presence of steep lapse rates and cold air aloft, some small
hail remains possible, but overall trend should be for activity to
decrease with onset of nocturnal cooling.