One of the first things meteorologists do when they forecast the weather is look at the numerical models — the computer simulations of the atmosphere. There are a handful of these models, and every weather forecaster, every weather app begins with them. Some of these apps are proprietary in the way they approach their work, but I think it’s well understood that different apps may begin with different numerical models. And even though every one of the numerical models has the same goal, they all work slightly differently because they have different resolutions — meaning, how fine they break up…