The analog method is a forecasting technique that evaluates current weather conditions against historical weather maps and patterns.
Forecasting persistence means that the current weather will continue into the future. Surface weather systems often travel in the same direction and at the same speed, according to the steady-state or trend technique.
If there is no evidence to suggest otherwise (such as a blocking weather pattern upstream, a strengthening storm, etc.), the steady-state or trend method (which has a lower accuracy) is used. It assumes that weather systems will tend to move in the same direction and roughly at the same speed as they have been moving.
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