I Built a Weather Engine That Tells You When to Ride, Play, or Water

Every mountain biker knows the ritual. It rained last night. You check the radar, clear now. You check the trail association's Facebook page, nobody's posted. You text your riding buddy: "Think the trails are good?" They don't know either. So you either stay home and miss a perfectly rideable day, or show up and chew through muddy trails that needed another six hours to dry. I got tired of guessing so I built a weather decision engine that answers the question directly: is it too wet to ride? Then I realized the same engine could answer two more questions: is this field playable? and does my garden need watering? This is the story of the Groundwise engine, a single Swift package that powers three iOS apps by asking the same underlying question from different perspectives. The Problem With "Did It Rain?" Weather apps mostly tell you what will happen, and to a lesser degree they can tell you what happened. What they don't tell you is what it means for the specific thing you want to do. H