Just read through the thread some quick hits from the Qs.
Models have sucked lately. Not surprising since the overall patterns have been more subtle, and not major synoptic scale systems involved.
That said, some did have storms coming through. Yes, there was a forecasted risk of severe storms and SPC Severe Outlook Risk areas covering Iowa that morning/day. A complex of storms with damaging winds as the main threat was certainly a possibility. The forecast struggled on the evolution of overnight storms to afternoon. Leading to...
No, we don't/can't really forecast, Hey! There's going to be a derecho tomorrow. We can forecast the risk of storms with damaging winds. We can make a forecast on how favorable conditions are for damaging winds, if the risk is higher than normal, etc.
What makes a line of severe storms go completely beserk and do this? Shrug emoji. It's like trying to figure out which tornado is going to go from funnel to EF-5 and which one is only going to be EF-0. There's still some special sauce in there that's just not going to be able to be handled with accuracy in advance or near-real time.
There are days where it looks like if there are any storms, it's going to be horrific on the tornado front, but for some reason they just can't sustain, even though it looks text book.