How to get pop up reminders to work on macbook pro running lion

I presently have all of my devices, ipod, iphone and macbook pro syncing beautifully in icloud with one exception. If I create a reminder it will pop up on my ipad and iphone, but not my macbook. Sometimes I am at the macbook and want to see that popup from reminders. I love that I can create it on my ipad and it shows up on my macbook in ical, but I don't get the same alert I will get on my ipad or iphone. I am just scatterbrained enough that those pop-ups are very helpful. I have been in system prefs and ical prefs but not finding anything for this. Help is appreciated 🙂