I cancelled Sirius XM months ago but still get the misplaced warnings. I recall the issue is that the National Weather Service uses a very broad range map so it is easy to get warnings that do not apply. I am in San Diego and get Arizona heat / windstorm warnings. Not that frequent though, perhaps once every couple of months.
I suspect it is linked to the Traffic info and not to the Sirius XM.
2015 Trailhawk, Billet Silver Metallic 3.2L V6
Black Leather Interior, 8.4AN, 9-Speaker Alpine
Trailer Towing Package, Sunroof
Build date Apr 2015
2001 Grand Cherokee Laredo, Silverstone Metallic 4.7L V8