To predict growth and decay of precipitation over the radar-based extrapolation, a blending system was developed to incorporate the best
features of forecast precipitation from SWIRLS and numerical weather prediction (NWP) model. The blending system consists of 3 components:
(a) SWIRLS QPF, (b) QPF from convection permitting NWP model, and (c) the blending algorithm. More weighting is given to the nowcast
in the first 1-2 hours, and weighting of QPF from NWP model then gradually increases towards longer lead time up to 6 hours ahead,
after applying phase correction in location and calibration intensity of model forecast precipitation as compared to the actual rainfall
analysis (SWIRLS QPE).
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