IPA: /ˈfɔːrˌkæstər/
KK: /ˈfɔrˌkæstər/
A person who predicts or estimates future events, especially related to weather or economic conditions.
The forecaster predicted rain for the weekend.
Forecaster → It is formed from "fore-" (meaning before) and "cast" (from Old English *casten*, meaning to throw or to predict). The word "forecaster" refers to someone who predicts or throws forward information about future weather conditions.
Think of someone who 'throws forward' ('cast') predictions about what will happen 'before' ('fore-') — that's why a forecaster is someone who predicts the future.