San Diego heads out to Costco in Chula Vista on Saturday afternoon as Hilary approaches. #sandiego #hilary #chulavista The National Weather Service has issued a Tropical Storm Warning for San Diego County - upgraded from the first-ever Tropical Storm Watch issued Friday morning. A warning means tropical storm-force winds are expected within the next 36 hours. The window for the impact has shifted and is now Sunday morning until Monday morning. Heavy rain and strong gusty winds will be out ahead of the center of the storm reaching San Diego. The center is forecasted to move in after 5:00 p.m. Sunday. For the latest weather conditions, head to: https://www.cbs8.com/weather/ CBS 8 is the local source for San Diego breaking news and top story headlines. Get the latest local San Diego TV news, sports, weather and more. More from CBS 8: Website: https://www.cbs8.com Twitter: https://twitter.com/CBS8 Facebook: https://www.facebook.com/News8 Instagram: https://www.instagram.com/cbs8