Abstract
Fourth-order difference approximations are implemented in a three-parameter baroclinic quasigeostrophic model of the atmosphere based on a modified version of the Bushby-Whitelam [2] model, currently in use at the Israeli Meteorological Office. The fourth-order accurate numerical forecast on a mesh covering Europe and the Mediterranean regions results in improved locations of low- and high-pressure centres as compared with the second-order forecast. The scheme also yields better estimates of the changes in position and intensity of the synoptic systems. The fourth-order numerical forecast tends, however to lower the values at the pressure centres. This so-called pillow effect still has to be explained.
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