You go in the mall to shop without a coat or umbrella because it's a nice day, then you come out carrying bags of stuff you just bought and have to run through a rainstorm a half-mile to your car. It's not just because you forgot your coat. There's real science going on here.
Minute Earth explains why the mall is more liable to see bad weather than the surrounding areas. Lucky for us, there aren't all that many shopping malls left. But the effect is seen in other structures that vary from the surrounding landscape. They don't waste any time explaining it, either. This video is less than two minutes long- the rest is an ad.