Explanation:

- The weather report ______ the fishermen not to go fishing the next day.

- Option 1: announced

- "Announced" is used for making a public statement. It does not fit best here because it lacks the advisory tone required for the context.

- Option 2: insisted

- "Insisted" implies a strong demand or assertion. It suggests forcefulness, which isn't typical for weather reports giving precautionary advice.

- Option 3: requested

- "Requested" means asking someone for something in a polite manner. It implies seeking compliance but does not strongly convey advice or caution.

- Option 4: advised

- "Advised" means to recommend or suggest something as a course of action. It fits perfectly as weather reports commonly provide guidance on whether to proceed with certain activities based on weather conditions.