From Glossary of Meteorology
Forecast methods based upon analysis of a set and/or series of synoptic charts; the most common means of arriving at a weather forecast.
These techniques usually contain elements of a physical, kinematic, and climatological nature and are, to an appreciable degree, subjective. This term is used primarily to distinguish these methods from others such as mesoscale forecasting, numerical forecasting, statistical forecasting, and climatological forecasting.
Bundgaard, R. C. 1951. Compendium of Meteorology. 766–795.