with a lifeguard a little while ago about the challenges that 120-degree heat can -- those challenges that these lifeguards face. >> hydrating is the key to success here at the water park. staying cool, not skipping a meal because they want to go on a ride or running out of sunblock. these are the difference between life and death at a water park when it's 120 degrees and so humid outside. >> reporter: now, we are expecting a high temperature, perhaps a record high temperature today of 120, 121 degrees, possibly. it has just spiked up quite a bit in the last hour or so. it was only about 105 or so an hour ago, and you can see right now this thermometer showing it is about 120 degrees right now where i'm standing. you see the sweat just beading up on my arm. i've been out here for about ten minutes now, so it is really, really hot, fredricka.