OAKLAND, CALIFORNIA — From his home in northern California, Nick Russell, a former farm manager, is monitoring the Los Angeles-area fires. He knows that about 600 kilometers south, people in Los Angeles are relying on his team’s live neighborhood-by-neighborhood updates on fire outbreaks, smoke direction, surface wind predictions and evacuation routes. Russell is vice president of operations at Watch Duty, a free app that tracks fires and other natural disasters. It relies on a variety of data sources such as cameras and sensors throughout the state, government agencies, first responders, a core of volunteers, and its own team of reporters. Anmore