Meteorology is perhaps the greatest consumer of the advanced computer industry. Nowadays 30-50 computational forecasts are made daily in the biggest forecast centers which have some deflection. The expert picks out the probable weather from the data of the collective forecasts. The meteorological models need computers with the biggest computing capacity available on the globe. In the past, computers’ content and operational ability was not enough to make adequate weather forecasts. Among others this was the reason why we had to wait almost 25 years until the accuracy of the computational forecast could be rivaled with the traditional forecast method.  The engagement of faster computers have meant to the meteorologists, that atmosphere models were increasingly accurate and detailed. The meaning of GRID is that computers connected to a network can accomplish a task in need of huge computing capacity by dividing it among each other.  With this a supercomputer-performance storage capacity and computing efficiency comes off, even in desktop computer environment for only fragments of the price of a supercomputer.  The available computing capacity on the one hand can be used in the models’ development, on the other hand it can be used int he virtual forecast calculation. Nowadays there are several GRID projects running in meteorology. Based on a GRID system climate project, several british universities and the British Meteorological Institute have joined forces in order to build a worldwide „presumption-based forecast” for the clime changes that can occur in our century. The project examines whether the global warming causes the change of the Gulf Stream or not. If it happens to be true, then what consequences can we expect.