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+=====Stochastic Parametrization=====
+**Using the Plant-Craig stochastic convective parameterization in an
+ensemble forecast system**
+We have implemented the Plant-Craig (PC) stochastic convection scheme
+into the limited-area COSMO (Consortium
+for Small-scale Modeling) model. We have run the model with initial
+and boundary conditions provided
+by selected members of the ECMWF Ensemble Prediction System (EPS).
+This allows us to compare how much
+ensemble spread is introduced to the ensemble by the stochastic scheme
+relative to that already present.
+A stochastic parameterization, like the PC-scheme, takes into account
+the fact that the intensity of unresolved
+convection is not merely determined by resolved-scale parameters, but
+also by unresolved physics. To this
+aim, the PC-scheme, being based on statistical physics, uses
+convective plumes that are randomly drawn from a
+probability density function that describe the chance of launching a
+plume with a certain mass flux each time the
+scheme is called.
+----