Gray tabby with white chest and notch in left ear

I lost my gray tabby cat yesterday around 3pm in Harrisonburg. It slipped out the door near Court Square on Main Street while I was loading groceries. He's a medium-sized cat, about 9 pounds, with a gray tabby coat, white chest and paws, bright green eyes, and a distinctive heart-shaped patch of white on his chest. His left ear has a tiny notch from an old injury. He doesn't wear a collar. I've had him for three years; he's like family and I’m really worried. If you’ve seen him or have him safe, I’d be forever grateful to get him back.