A TEST OF GRAPHICAL METHOD FOR QUANTITATIVE PRECIPITATION FORECASTING

A test of graphical method for quantitative forecast of precipitation is presented. First the saturation water vapor content below 500 mb is calculated from the forecasting value of 1000-500 mb thickness by two-layer model. Then the water vapor content is again predicted from the assumption of dq/dt=0.The difference between the two predicated values of water vapor content gives the forecasted precipitation (if the difference is positive).