When *attempting* to trade the corn and soybean weather markets, I use these websites, among others: http://water.weather.gov/precip/ http://radar.weather.gov/ridge/Conus/full_loop.php See attached images. Just thought I'd share the links. Currently observing whether beans will get some moisture to aid pod filling.
When I traded commercial energy in the 90's, we employed professional meteorologists and consultant meteorology firms FWIW. ( Trying to anticipate Heating and Cooling Loads )