Plain English Meaning

Weather maps that show what the weather is expected to look like at a future time, highlighting the conditions that matter most to pilots — like low ceilings, bumpy air, icing, and storms.

Full Definition

Forecast charts that depict expected significant weather conditions — including areas of IFR and marginal VFR, turbulence, freezing levels, and other hazards — for a future time period. They are issued in low-level (surface to 24,000 feet) and high-level (25,000 to 60,000 feet) versions, and show forecast conditions valid at a specific time, typically 12 and 24 hours ahead.