The new radar set at Lincoln just came on line around this same time in November. Gee Wally, I’ll bet it has something to do with that. I see it still picks up windmill farms though, as witnessed here north of Lincoln and northwest of Bloomington.
http://radar.weather.gov/radar.php?rid=ILX&product=NCR&overlay=11101111&loop=yes
My suggestion: crank it up to 11!