There's no single, centralized online source that lists all school closures in Tullamore, Ireland on a particular day. To find out if a specific school in Tullamore is closed, you'd need to check the school's individual website or contact the school directly by phone.
Some schools might also post closure announcements on their social media pages (Facebook, Twitter etc.). Local news websites or radio stations in Tullamore may also report on widespread school closures due to weather or other emergencies.