Quantitative Precipitation Forecast
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According to the United States National Weather Service's National Digital Forecast Database, The Quantitative Precipitation Forecast (abbreviated QPF) is the expected amount of liquid precipitation (in hundredths of inches) accumulated over a six hourly period. A QPF will be specified when a measurable (1/100th of an inch or more) precipitation type is forecast for any hour during a QPF valid period. NDFD valid periods for QPF are 6 hours long beginning and ending at 0000, 0600, 1200 and 1800 GMT.
QPFs can be found at the Hydrometeorological Prediction Center
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