This is no longer simple random sampling, because some combinations of 100 students have a larger selection probability than others â for instance, {3, 13, 23, ..., 993} has a 1/10 chance of selection, while {1, 2, 3, ..., 100} cannot be selected under this method.
Definition of 'weather forecast'. weather forecast. A weather forecast is a statement saying what the weather will be like the next day or for the next few days.
Weather forecasting - How models create forecasts. 1  The basic idea of numerical weather prediction is to sample the state of the fluid at a given time and use the equations of fluid dynamics and thermodynamics to estimate the state of the fluid at some time in the future.