てんきよほう天気予報tenkiyohou
1.

A process of predicting and communicating expected changes in atmospheric conditions over time, using data such as weather maps to analyze and anticipate future weather patterns.

2.

An informational service that provides updates about expected weather conditions, including short-term, weekly, and long-term predictions.

3.

The systematic study and presentation of meteorological data to inform the public about probable weather phenomena and their implications for daily activities.

Example:

天気予報が当たったよ。