Definition
A vertical measurement of the atmosphere that records temperature, humidity, pressure, and wind at successive altitudes from the surface up through the upper atmosphere. Soundings are typically made by radiosondes carried aloft by weather balloons, and the data forms the basis of upper-air charts and forecasts.
Plain English
A snapshot of what the air is doing at every height above a location -- how warm it is, how moist, how much pressure, and how the wind is blowing -- usually taken by sending an instrument package up on a balloon.
Context Anchor
Seen in aviation weather discussions, especially when pilots or forecasters want to understand clouds, winds, icing risk, or changing weather above an airport or route.
Derivation
From the nautical word 'sounding' -- dropping a weighted line to measure water depth. Meteorologists borrowed the term: instead of probing downward into water, they probe upward into the atmosphere. The idea is the same -- measuring what you cannot see by sending an instrument through it.
Why Pilots Care
Reveals layers of instability, temperature inversions, icing levels, and wind shear that directly affect flight safety and route decisions.
Analogy
It is like checking the conditions on each floor of a tall building instead of only looking in the lobby. The air can be very different at different heights.
Grounding Statement
Picture a balloon released at sunrise carrying a small radio package; as it rises, it transmits temperature, moisture, and pressure every few seconds until it pops in the stratosphere -- that stream of data is the sounding.
Intuition Check
Sounding does not mean listening for sound here. It means measuring conditions through a vertical column of air.
Example Sentence 1
The morning atmospheric sounding showed a strong temperature inversion at 4,000 feet, which explained the smooth air above and the haze layer below.
Example Sentence 2
Before crossing the mountains the pilot checked the morning sounding for strong winds aloft that could produce turbulence.