Every winds aloft forecast pilots rely on traces back to a global network of 900 balloon-launched radiosondes that measure the atmosphere twice daily from surface to near-space.
PIREPs are real-time weather observations from other pilots - learn how to decode the format, interpret turbulence and icing reports, and file your own.
PIREPs are real-time pilot observations that reveal what forecasts can't - actual cloud tops, turbulence intensity, and icing conditions from pilots who just flew your route.