Or shall I say thunder-graupel. I was out about 3:45pm on the 18th and was caught in a graupel and lightning storm! The lightning was pretty frequent and very isolated in nature, moving less than a mile down the road and the storm intensity was much less. Once I got home and was able to look at the radar, there was a pretty distinct squall line with some 38-43DBz returns. I read somewhere once that thundersnow was extremely rare in the US, but searching the forum found quite a few hits regarding it. I just thought it was interesting as this is the second time I've seen it in under a year.
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