Snow Tires

I'm a Florida boy.   I moved here in 1971 and grew up in Pinellas Park.  And while I was inoculated in infancy by Milwaukee winters, I barely know anything about driving in snow.  

When my brother, who lives in Colorado, pinged me with this dire and breathless admonition: "I highly recommend you get snow tires.", I was inclined to pay some attention.  

I don't know from snow tires.   I don't know the etiquette.  I don't know the science, the practice nor the art of changing tires twice a year.   

Since I'm having my pre-trip check-up and maintenance yesterday, I did some research to see if I needed to plunk down a few hundred bucks on tires I would only use once.  I hit the forums, my brother hit the Youtube and we reported back with our results.

1) the weather forecast for the next 10 days looks clear.  No guarantee, of course.

2) This:

It looks like this guy does have snow tires.   But I'm going to take a chance.   Most of the forums I read say that the all-season 19" Goodyear tires on my Model S are perfectly fine for snow.