An avionics computer system receives or calculates storm growth rate data, converts that data into a renderable format, and displays that data visually. The avionics computer system receives location and trajectory data, projects a future storm size/height based on the trajectory and growth rate, and determines if the storm is likely to intersect the trajectory when the aircraft is projected to reach the storm location. Certain threshold growth rates are associated with some artifice indicating the severity of the storm. The application of such artifice may be weighted according to the aircraft trajectory, estimated growth rate, and a projected proximity to the storm.