I'm impressed that the FD had snowmobiles. Do they have a winter racing team or something?
Folks are occasionally rescued from their cars during winter around here. It's not what you and your car can do, it's the accident somewhere in front of you that will create the stoppage. All it takes is ONE. (I hear this on my scanner a lot).
I read somewhere that the FD rented 200 of them (on a no bid basis of course) from a politically connected source at an insane price. But, that is about the only way anything happens in Chicago.
The same place reported the real problem was not the snow but that lake water was being blown up on LSD creating ice that actually led to the accidents that closed it down.
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Warning - I am not an expert on anything having to do with this forum, but that won't stop me from saying what I think.
Bob