Computer weather models are the biggest tool meteorologists use to forecast the weather. But why are there so many, which one is the best, and why aren't they all better? On this week's episode, the ...

That puny pulse of rain Wednesday morning may have been a welcome watering for the plants and grasses and evidently didn’t cause problems — except for the heavy hitters in the weather-app universe.

Google researchers have built an artificial intelligence that they say can forecast weather and climate patterns just as well as current physics models while also requiring less computer power.