The other icon set - the one matching the Current Conditions/Extended Forecast - had a version where it was a rectangle with the word COLD and the entire rectangle would flash like "frigid" did. An interesting icon.
We still haven't seen the "SMOKE" icon with the blackened cloud. I remember seeing that one, too.
I never saw either one of those before, though I did see "SMOKE" a couple of times on the 3000. Only in text, unfortunately. I also saw "BLO SNOW" on the "Latest Observations" page on the 4000, but, again, only in text.