Weather Forecasting For Soaring: Flight -wmo- Technical Note No. 203- !exclusive!

Pilots were beginning to attempt long-distance cross-country flights and altitude records. These attempts were frequently thwarted not by pilot error, but by a lack of granular, specific meteorological data. Standard METARs (aviation routine weather reports) and TAFs (terminal aerodrome forecasts) focused on surface conditions and cloud ceilings—vital for landing aircraft but insufficient for finding the strong thermals needed to climb to 10,000 feet.

The publication includes several now-classic diagrams: but by a lack of granular

The 12Z (or local dawn) radiosonde is the "truth serum." The note instructs how to modify the morning sounding for solar heating. but by a lack of granular