It looked pretty much like this does on this dark tinted back window of a white Ford SUV. In fact the dirt even showed on this white car! Ugly, ugly, ugly--get thee to a car wash!
Where did it come from? Apparently, a dust storm came up in Texas and the rain came down from the clouds through the dust cloud, landing laden with suspended dirt particles upon our vehicles and anything else outside (would have hated to have had laundry outside drying!). Here's a link to the National Weather Service explanation of what happened. It was worse in Springfield, Missouri and in the Ozarks.
I'm glad this got a mention or two in some news sources around town--we did get some "dirty rain" when they were working on the Grandview Triangle. This time, there was no big construction project to blame!