I just use the script from here. it works....
https://www.willyweather.co.uk/info/widget/warning.html
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you can chose between a full bar across the site or just a corner one, and you can also choose what corner/colour to use too.
Meteoalarm is not reachable today, maybe it went offline?
Had a look at Aerisweather and made a developers account, so because my data is sent to PWS weather their API is for free.
Not sure how to implement the code on my site, Aerisweather has a good interface for selecting your warnings etc.
Works with JSON, guess I have to learn how to use JSON
As willyweather is only for UK users, no go for me...
Have a good weekend