http://pissinontheroses.blogspot.com/2012/07/37x-background-radiation-in-1230pm-stl.html
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The rain/storm from this morning ended at approximately 12:30pm. A swipe from our truck returned a reading 37x greater than background levels. A swipe taken 3 hours earlier returned a reading of 27x greater than background radiation. Our live outdoor airborne radiation monitor recorded an approximately 50% increase in background radiation.

A quick look at airborne radiation chart indicates that weather moved into the area around 5am with an initial peak in radioactivity that may represent local washout. From 6am to 12pm airborne radioactivity increased as the leading edge of the jetstream neared Saint Louis.