difference between a weather forecast and a weather report?

What is the difference between a weather forecast and a weather report?
Before, I think they are the same.Help me explain it clearly.

I wonder why so many students ask this rather narrow question? You must all be using the same textbook out there someplace.

A weather forecast is a prognostication about future weather.
A weather report is information about weather that has passed or is in process.

In a larger sense, a TV weather report includes all of these.