Communications Standards of Operations

I have to create a Communications Standards of Operations (3-4 pages) for a the Human Capital Branch within an Organization. The standard of operations must cover external communications. Such communications include announcements (job and informational announcements) notifications (notifications include weather notifications, traffic delays, work delays or closures). Any form of announcement that may affect the organization as a whole. SOP needs to inform the employees within the Human Capital Branch the announcements must be concise and understandable.