Yep, the S word has entered the conversation among my local (100 miles west of WDW) meteorologists, too.
For those who don’t know, it DID snow at MW in 2010. I wasn’t running, but I was there to witness it! It was very confusing… walking out to my car the morning of the half and it was drizzling, but the drizzle was… a solid??? Literally sat there watching the sleet hit my windshield for a few minutes, unable to process what was happening. Got to the TTC and boarded a monorail, on which a bunch of half finishers were shivering hard under their Mylar, looking shell shocked.
The marathon the next day was snow- and sleet-free, but the temp dropped below freezing and water on the ground at hydration stops was freezing. People I know who ran it said it was pretty slippery.