抄録
Parameterization schemes for stratiform and convective condensation with cloud water content and cloud cover as dependent variables are implemented in a limited area model for weather prediction. The scheme for stratiform clouds is based on the approach according to Sundqvist (1978, 1981). The scheme for the convective clouds is based on Kuo’s (1974) approach, which is modified to include the prediction of cloud water. A description of the latter scheme is given in the present paper. Aspects regarding the necessary combination of the schemes in connection with transition between the two stability regimes are also discussed. A specific 36 hour forecast is chosen for detailed examination of the predicted cloud and precipitation patterns over Scandinavia. Verifications of the forecast fields are performed utilizing mostly synoptic data. The predicted cloud covered area coincides well with the observed and the amounts of accumulated precipitation is also in agreament with observations. There are no observations of cloud water content availible and the realism of this field can therefore only be judged indirectly by comparision to the precipitation rate. In connection with the attempts to verify the predicted fields of cloud water, cloud cover and precipitation, the urgent need for relevant observational data stood out prominantly.
