It's a very nice arena. I attended an OU-MU womens game about 3-4 years ago and was really impressed.
They have received a bunch of snow in Columbia the past few weeks but starting tomorrow it will be melting. However, most of the parking is on hills and the parking lots are all pretty slanted. Be careful when parking and walking. Should be fine, but I'd wear some boots or something or else your feet will be really wet and thus cold.