For those who are getting wifi pop ups, open up your phone's dial and enter *#6335623# and disable wifi offloading. This will remove wifi pop ups for good! (got this info at a different thread)
It seems like a bug whenever the weather alert message pops up.
I found a way to get rid of this bug temporarily: just close the messaging app, open task manager, and tap 'clear memory'. Blue names gone! :D