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Traditional weather reports will give notice of vague forecasts and severe weather alerts in your general area. The code and tools presented in this article will allow you to create precise detection zones so you can receive a page, SMS, or e-mail a few minutes before a precipitation event is likely to occur at the monitored location. Use GD and Perl for image processing of the NOAA WSR-88D radar data to create your own precipitation alerts for precise areas. Choose your notification method and let users know when the rain will begin and when it will clear.