The large number of input parameters and the availability of ground observations provides an ideal environment for the application of supervised machine learning techniques. Many existing supervised learning algorithms demonstrate only small amounts of skill and are too inaccurate to be used successfully by forecasters. To improve accuracy, a spatial learning algorithm can be used so that relationships such as bright band can be automatically identified. This is accomplished by clustering the polarimetric data in order to identify regions of similar values. Afterwards, spatial relationships between clusters are identified and a spatiotemporal relational probability tree is used to determine which relationships correspond to different precipitation types. Initial findings suggest that this approach can increase accuracy when compared to similarly sized decision trees that do not include spatiotemporal information.
Once the learning portion of the algorithm is complete, precipitation types can be classified using data that is available at the time of the event. In addition, as new forms of data become available the probability tree can be relearned with minimal changes to the algorithm itself.
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