California June 15, 2021 6:57 am What Defines a Heat Wave? We often hear about “heat waves” in San Diego County but what, exactly, defines this weather pattern? NBC 7 meteorologist Dagmar Midcap explains. US & World Videos 2:29 Family mourns 13-year-old killed in Escondido crash 2:01 No evidence Oceanside Pier fire was arson, officials say 10:00 Small plane crashes into El Cajon neighborhood | San Diego News Daily 2:20 Audio details what happened moments before small plane crashed in El Cajon 0:46 San Diego's next police chief could be confirmed Monday