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NWP stands for Numerical Weather Prediction, and NWP models are the models that predict the overall wind pattern. They require a very fast computer (typically a super computer) and they are run operationally by the meteorological institute/service/office in each country. Due to the advent of cheap Linux clusters, it has been possible for smaller companies and institutes to run a part of the meterological modelling chain by themselves. Their results can also be used as input to Prediktor.
The grid spacing varies from 50 to 5 km and they can predict the weather out to typically 48 hours. Dependig on the implementation NWP models are run every 6 (ie four times a day) or 12 hours (ie twice a day).
A good example of a NWP model is the DMI HIRLAM model, which has been used a lot to drive Prediktor.
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