In NSW (A state of Australia) the Rural Fire Service provide the following RSS Feeds:
Common Alerting Protocol (CAP)
Along with others.
They are all located here: https://www.rfs.nsw.gov.au/news-and-media/stay-up-to-date/feeds and are licenced under: Creative Commons Attribution 3.0 Australia License (http://creativecommons.org/licenses/by/3.0/au/) as well as have these guidelines for developers republising their warnings (https://knowledge.aidr.org.au/media/5979/guideline-warnings-republishers.pdf).
It would be nice if these layers could be added to Windy. Or the ability to add custom layers of these types without having to develop a plugin.