Concept:Forecast is the correct word for a report on future weather conditions.
Explanation:The blank in the sentence clearly refers to the weather.
A forecast is a statement about what the weather is expected to be like in the future.
For example, a weather forecast announces whether it will rain or shine.
Broadcast means to transmit a programme on radio or television.
Prediction is a more general statement about the future, not limited to weather.
Announcement is simply a public statement or notice.
Among the given options, forecast is the word that best completes the sentence.
Answer:A. forecast