How to read precipitation forecasts File Names: prec01_forecast_above.bi - Archive of lead 01 seasonal above normal precipitation probabilities prec01_forecast_below.bi - Archive of lead 01 seasonal below normal precipitation probabilities prec01_forecast.bi - Archive of lead 01 seasonal precipitation categories Beginning of Record: Seasonal forecast issued in December 1994 Type of File: Gridded Binary File Grid Resolution: 2x2 Grid Domain: 130W to 60W longitude, 20N to 56N latitude Grid Values: 1-below normal;2-near normal;3-above normal;0-equal chances (categorical files) Note: Probability files are expressed in total probabilities... not probability anomalies.