Nearly every US weather prediction comes from a single source: The National Weather Service, a US government organization.
They have forecasters around the country and weather sites all over areas (often at places like public schools or government buildings or airports) to get weather data and make forecasts. But yes they have weather models to help aid their predictions of course.
In the U.S., at least, there typically are monitoring stations scattered at various points which take readings. These are part of the same systems meteorologists use to get their data and make their predictions.
The number of stations in a given area is dependent on several things, including terrain, number of people, and others. However, you probably aren’t more than a few miles from your nearest station, in most cases.
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