I happened to be driving through the area just around the time this was happening. We left Sikeston MO on I 57 at around 7 AM and drove through Effingham IL at around 11 AM. It was very windy, but there was no dust blowing at all. we might have been just far enough east of the flat prairie land to miss the dust. It was raining after that.
I was northbound on I-57 from Salem to Champaign. There was enough rain coming down to apparently keep the dust from being a problem like that. Same thing on I-74 and I-39