To post emergency news, you must post a news item in the special Emergency News group, created for that sole purpose. In your home portal, click Add News on the right side, or use the Groups menu at the upper right and click Emergency News.
If you do not see this option, you do not have rights to publish emergency news. To get rights, you must be a member of the Emergency News group. Contact the admin for the group or submit a support ticket and we'll help out.
Once there, select "Emergency News" in the Audience column.