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When temperatures continent-wide reach into the thousands of degrees, everything burns."
Heat waves don't go that far. Our enemies also would not be able to hit us with thousands of nukes. Most of their nuclear weapons by far are short range or otherwise not portable into the U.S. and would not reach U.S. soil. Many others would malfunction (junk missiles), and their bombers would not penetrate far enough without being shot down. The Russian propaganda about some of its newer weapons resembles similar Iranian propaganda and doesn't even make sense (e.g., Russia's beach-busting super torpedo, Russia's missile defense flack weapons, etc.).
Here. Play with this. It's fun in spite of its exaggerations.
https://nuclearsecrecy.com/nukemap/ The sure way of eventually being nuked is to appease in the face of the bully enemy's nuclear blackmail and extortion. Commie/fascist expansionism must be stopped.
Yeah seen that site a decade ago. Nothing new.
As far as your prognosis on the Russian missiles - you better hope you are right, if it comes to that.