Looking at the current radar returns in central Missouri, the trough is definitely not completely void moisture. From the Kansas City NWS forecast discussion this morning:
National Weather Service Kansas City/Pleasant Hill MO
500 AM CST Mon Jan 20 2020
.Discussion...
Issued at 336 AM CST MON JAN 20 2020
Interesting weather set up for Monday, which begins with a surface
high centered roughly over the eastern Dakotas. With the center of
the ridge situated well off to the north, cold air will continue to
filter into the region for the next day or so. This would normally
keep the weather pretty fair, but currently over central Minnesota a
shortwave trough is currently diving southward into Iowa and
eventually will move over the forecast area. Now, moisture within
the column will be difficult to find, but this trough may provide
just enough lift and the air mass may just be cool enough to
condense the limited moisture into precipitation in the late morning
to late afternoon hours.
Maybe we can pick up a little something tonight into tomorrow morning with the frigid air in place. I'm grateful for whatever we can get this Winter.