You may have noticed a bunch of gray squares on the EZWxBrief EZDeparture Advisor™ when planning a route and wonder what those gray squares mean...

Learn how to delete a route in the EZWxBrief progressive web app.

The icing forecast in EZWxBrief is a calibrated probability that ranges from 0% through 85% as shown in the legend below. Icing forecasts in EZWxBrief rendered in the meteogram and in the Route Profile view carry a lead time as far out as 20 hours in the future. So what is a calibrated probability and how should it be interpreted?