Weather on iPhone

I don't know where all you Verge readers are located but I am in STL,MO. and just got hit by a few inches of ice and the weather warnings were all over the place. Then I thought: "what is the best weather app for iPhone?" I heard incredible things about Dark Sky from The Verge and though it was pricey ($4-$5?) I got it. It looks beautiful and when Siri was saying it was currently snowing when it wasn't, Dark Sky got it down to thew hour.

What is the go-to weather app on your iPhone/Mac? I am currently thinking about getting an app for Mac but don't know anything about them. What is your set up now?