Weather is the short-time-scale (< a few days) evolution of the of
the atmosphere.
Climate is the statistics of weather.
Weather prediction. The evolution of the state
variables of the atmosphere is governed by nonlinear dynamics (i.e. ÒchaosÓ),
and is therefore inherently unpredictable beyond a certain
period of time.
Climate
prediction. There
is no reason to doubt the predictability of the statistics of weather.