Snow
... nature of the modeling efforts that are required.
… response mechanisms of snow are at a much slower time scale than for most of the other forms of precipitation.
… The melt takes place and the runoff is "lagged" due to the physical travel processes.
… Items to consider in the snowmelt process are the current "state" of the pack and the snow water equivalent of the snow pack., as well as the melt potential of the current climate conditions.
… A rain-on-snow event may produce very high runoff rates and is often a difficult situation to predict due to the integral nature of the runoff and melt processes. The timing of these events is often very difficult to predict due to the inherent "lag" in the responses.