COPY THIS AND HANG IT ON THE WALL OR PUT IN INTO A NOTEBOOK:
SO YOU WANT TO FORECAST PRECIPITATION PROBABILITY FOR EVERY HOUR OF THE DAY!
1. Click on this: http://www.nws.noaa.gov/mdl/gfslamp/statebull.shtml
This lists the forecasted PROBABILITY OF PRECIPITATION for each hour for the next 24 hours. Pretty simple.
This is how it is decoded: It simply lists the chance of precipitation at that hour in percentages, the higher the number, the better the chance of having precipitation.