HAILCAST is a one-dimensional, physically-based hail forecasting model. It is a revised version of the coupled cloud and hail model developed by Poolman (1992) and improved upon by Brimelow et al. (2002) and Jewell and Brimelow (2009).
HAILCAST is designed to be embedded within a convective-allowing forecast model. It will produce forecasts of hail size, and if desired, hail density and terminal velocity. Key features include:
Hailstone growth through liquid water accretion, ice particle collection, condensation, and sublimation
Explicit calculation of hailstone temperature
Regimes of wet and dry growth
Use of multiple initial embryo sizes and insertion temperatures
Parameterized horizontal motion of the hailstone through the convective updraft