"The National Oceanic and Atmospheric Administration (NOAA) is a fantastic government agency responsible for the majority of the weather data in the United States. Using the publicly available and easily accessible reflectivity data from one of the WSR-88D class radar systems, this article will show you how to choose a location and set up weather-change alerts for a precise geographical area. Please note that this is not a substitute for severe weather alert systems or designed to produce reliable precipitation forecasts. Rather, this article presents code and processes for determining if it's likely to rain very soon in a specific area. Conversely, the same code is used to produce alerts when a no-precipitation window has opened, giving you a handy notice of when it's time to dash inside from your car..."
