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 2:08 San Diego police increase efforts to stop human trafficking, prostitution 1:44 Project Homekey breaks ground on hotel conversion for homeless 2:14 Formerly homeless graduates in San Diego County get a new chance at life 2:31 Progress report for CARE Act mental illness recovery program in San Diego 2:32 California Prop 36 sparks heated debate ahead of 2024 election