The US government's surviving nuclear fallout web page was updated on FridayRight down the bottom of the page it says it was last updated on 25 February 2022.
I guess knowing about this page is a help. Here's a snippet:
A nuclear explosion may occur with or without a few minutes warning.
Fallout is most dangerous in the first few hours after the deto
Source: The US government's surviving nuclear fallout web page was updated on Friday (https://www.forexlive.com/news/the-us-governments-surviving-nuclear-fallout-web-page-was-updated-on-friday-20220228/)
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