While doing a test of the GOES (West) CI Probability in southeast Idaho it showed probabilities anywhere from 60-70% (yellow shading in the right image).

The very next update the probabilities dropped to near zero (no yellow in the right image).  However, the corresponding radar showed no storms with dBZ greater than about 25 nearby.  It seems like ground clutter (a few pixels of 55-60 dBZ nearby) caused the CI Probability to improperly drop to near zero.

-Champion