{i} weatherman, one who forecasts weather conditions; prophet, one who foretells future events
someone who makes predictions of the future (usually on the basis of special knowledge)
A forecaster is someone who uses detailed knowledge about a particular activity in order to work out what they think will happen in that activity in the future. Some of the nation's top economic forecasters say the economic recovery is picking up speed. see also weather forecaster. someone whose job is to say what is likely to happen in the future, especially what kind of weather is expected