Oh, and of course, as Americans fled the new menace of nature south, the Mexicans closed the border, just as it happened in the movie The Day After Tomorrow. (No movie ever mentions how the Mexicans accomplish this feat, since America is unable to manage the same on the other side of the border.)
They offer free access to Mexican medical care.
Oh I forgot about that part! I'm surprised my eyeballs didn't dislodge from the sockets because of all the rolling.