immune system. >> i never had so many sick kids in my office as i did in the last three weeks because they have been in a bubble. they need to be exposed to other viruses to build up their own innate immunity. >> reporter: pfizer hopes to seek emergency use authorization for its covid vaccine for children ages five to 11 as early as september, which means kids could be vaccinated soon after the school year begins.s kids could be vaccinated soon after the norah. >> o'donnell: that's some good news. nikki battiste, thank you. tonight, flash flood warnings are posted across arkansas and mississippi. some areas are being hit with more than a foot of rain. there have been numerous rescues in mound bayou, mississippi. and flask flooding in new and flash flooding in new jersey. we're also following a dangerous heat wave tonight. so let's bring in cbs' lonnieri quinn for the forecast. hey there, lonnie. >> reporter: hey there, norah. take big-time humidity and big- time heat you will get clash and get some big time storms out there.im look at the radar picture.