Home Run Weather, developed by The SI (which has an office in Valley Forge), measures the next 24 hours of weather and the potential for a home run to fly out of the ballpark during that timeframe.
Their scale, based on zero to 10, measures temperature, dew point, atmospheric pressure, and wind speed and direction as the main factors in predicting whether or not you'll have a good or not-so-good chance of seeing a home run at the ballpark. It does not factor in pitcher...so for Phillies fans, if Adam Eaton were out there on the mound, the scale wouldn't automatically register off the charts (kidding). It also does not factor in the park dimensions itself although it will factor in how the park is situated geographically (how home plate is facing).
It seems like a nice, quick app to reference what *could* conceivably happen at a ballgame. Of course, an old fashioned pitcher's game could breakout on a night when the wind is blowing out if you have a couple of ground ball pitchers out there...or if you have a couple of guys who have a tendency to give up the long ball, an offensive feast could break out on a night when the wind is blowing in. That said, it gives you a decent idea of what *could* happen and given it's free, it's certainly worth having in the arsenal of apps on your phone.