Preliminary by definition "preceding or done in preparation for something fuller or more important." i.e. a graphic may not be ready or details of the severe weather are still uncertain. When an advisory has a "preliminary" status the row will be YELLOW.

We try and be as accurate as possible and give our users plenty of notice. Due to the nature of what we do last minute advisories or updates can be made 24 hours a day however we try to avoid this as much as possible. Instead we may post admentants to the board and/or post additional non-advisory graphics to our social media accounts to show where any further risks are likely.

Our advisory system is currently in beta meaning there's likely to be issues. The way we have it setup at the moment is; Advisories will disappear once the date has passed, so at or just after midnight.