Flight Dispatch Oral Practice Exam 2026 – Complete Prep Guide

High-level prognostic charts are used for planning at cruise altitude and show forecast significant weather in the upper atmosphere. They typically cover from flight level 250 (25,000 ft) up to flight level 630 (63,000 ft), which is the common range jet airliners traverse for long-haul flights. This range lets crews anticipate hazards like turbulence, icing, and convection that can impact high‑altitude routes. They don’t depict surface weather or ceilings, and they aren’t intended to cover the lower altitudes from the surface up to FL240—that’s the domain of other, lower-level prognostic charts. So the description of their typical coverage from FL250 to FL630 is the correct one.