Did anyone get a WARN notice? - 2 months and counting

I received a formal notice about a mass layoff at my workplace. This is my first time dealing with any of this. I do not know if I should start looking now or wait for severance news. Has anyone been through this?

Start your search early. I wish I had begun the day of the notice.

Thanks for writing this out. I went through something close to it 2 months ago, and it settled down once I kept a simple log of every call and form.