Final answer:
A surface prognostic chart outlines areas of predicted variable trends based on the analysis. It helps geographers identify areas with well-predicted variables and areas with deviations from the predicted variable.
Step-by-step explanation:
The surface prognostic chart outlines areas of predicted variable trends based on the variables used in the analysis. This chart helps geographers quickly identify areas where the predicted variable is well correlated with the variables used and areas where there is less or more of the predicted variable.