So what i have done is used the custom html resource to insert an animated gif. all you need to do is find the one you want from your local news or any website that has the weather loop you want.
I decided to not overlay the weather with our network map as it gets a little two "Busy" but you can do that by inserting it as the background of the map.
As you can see below all i did was add a custom HTML resource to reference the animated gif. When the orion page refreshes it will pull a new updated gif.