Weather, terrain and airspace along your route.

The solid shape shows the terrain under the track; the dashed line the ridges within ±5 NM, sampled every 6 NM. The terrain used by the profile has a detail of about 1 km: it is not the detail of the fine wind. The cloud curve is smoothed over five points, as in the app: at the critical point it runs at about 8,700 ft, while the analysis uses the sample at the point, about 8,200 ft, with a forecast cover of 100 % and a top around 12,500 ft. The roughly 800 ft between plan and base is the difference of the two values: not cloud-free space. What is shown is the plan altitude at the alert point, not the whole sequence of altitudes; the passage time appears only where the example records it. The plan proposes altitudes and estimates the passages with the available data and the parameters set; deviations proposed by the app must be examined, they are neither a guaranteed route nor a clearance. Airspace: open flightmaps, sampled every 6 NM; the scale stops at 15,000 ft.

In the ensemble, about 5 of 20 members give a ceiling below 3,300 ft above ground (1,000 m threshold, count reconstructed and rounded). The app places this value around 24 NM from Zurich: that is not the alert point at 65 NM. It is a specific weather event, not the probability that the flight is safe. The ceiling above ground (AGL) and the cloud base above mean sea level (AMSL) have different references.