This option allows the user to vary the estimating parameters used to determine the likely areas of 34, 50 and 64 knot winds at the 48, 72, 96 and 120 hour forecast positions.

The parameters represent the average radius of 34 and 50 knot winds by maximum wind speed.  They are used in certain circumstances when estimating the 48, 72, 96 and 120 hour 34, 50 and 64 knot wind area.  These values should not be altered unless directed by PC Weather Products.