. >> and i'm dionne lyn. you are taking a look at santa cruz beach. temperatures soar into the triple digits in some cities. >> let's find out how long the heat will last. drew tuma. >> our dangerous heat wave rolls on. let's get a check how hot it is where you live. we are scorching. 109 in fairfield, 93 in hayward. it is 82 in the city right now. 97 in san jose. it's another hot day across the region. we still have our heat advisories and excessive heat warnings in effect for much of the bay area and again, with these hot temperatures is a high risk of heat-related illness, unfortunately as the sun goes down, by 9:00, we will still be sweat sweating with temperatures in the 70s and 80s. overnight, a red flag warning will go into effect for the threat of thunderstorms moving into the region. we will detail that new threat coming up in a few minutes. >> all right. drew. we'll see you then. thank you. >>> the heat is putting a serious drain on our state's power grid. abc 7 news in the north bay, joining us now live. what are we learning about the possi