Prognosticator (noun)

1. A person who makes predictions about future events or developments.
2. An expert or specialist in the field of forecasting or prediction.

Origin:

From the latin word "prognosticator" meaning predictor, from "prognosticate" meaning to predict, from "pro-" meaning before and "gnosticus" meaning knowing.

Examples:

1. The prognosticator predicted a mild winter.
2. The political prognosticator was wrong about the outcome of the election.
3. The financial prognosticator was spot on with his prediction of the market trend.
4. The weather prognosticator was off with his forecast for the storm.
5. The sports prognosticator was correct about the team's chances of winning the championship.