Agree the southern line is breaking up a bit, but there is still a very strong line showing from Iowa Falls to the MN line.Things seem to be trending down across IA and MO as I'm writing this. We'll have to wait and see if this is it for this event or if it's only taking a temporary break before resuming its rampage.
Having heard last night that tornadoes could touch down in areas like MN with snow on the ground, I found this 20 February 2014 video of a Jacksonville, IL tornado with snow patches on the ground. But, FTR, the high there did reach 62F/17C that day.
Nothing like tornado damaged houses with snow in their yards.
I tend to really like the NWS in Des Moines. They are usually consistent on how they rate their tornadoes.DMX/DVN seem to be among the more reasonable offices when it comes to tornado surveys & ratings, but it's been a long time since an obvious high-end violent tornado directly impacted substantial populated areas in Iowa. A positive thing of course, but it means their rating practices for such tornadoes haven't really been put to the test in the present fraught environment for that particular "science."
Iowa's previous record for most tornadoes in a single day was 35 on August 31, 2014.