Definition
Reports of weather conditions taken at ground level at airports and other observation stations, typically including sky cover, visibility, wind, temperature, dew point, altimeter setting, and significant present weather. The most common form is the METAR, issued routinely (usually hourly) with special updates (SPECI) when conditions change significantly.
Plain English
A snapshot of the weather at a specific airport, taken on the ground, that tells you what the sky, wind, visibility, and temperature are doing right now.
Context Anchor
Seen during preflight weather review before an instrument flight, especially when checking departure, destination, and alternate airport conditions.
Derivation
Surface here means at ground level (as opposed to upper-air observations taken aloft by balloon or aircraft). The pairing distinguishes weather measured where aircraft take off and land from weather measured higher in the atmosphere.
Why Pilots Care
Pilots use them to assess takeoff, landing, and enroute conditions for safe flight planning and decisions.
Grounding Statement
A surface weather observation tells you what a trained observer or weather sensor is seeing at ground level right now or very recently.
Intuition Check
Do not read “observations” as forecasts. Surface weather observations report actual weather at or near the ground; they do not predict future weather and they do not describe winds or conditions high above the airport.
Example Sentence 1
During preflight, she reviewed the surface weather observations for her departure, destination, and alternate to confirm conditions matched the forecast.
Example Sentence 2
Strong winds reported in the surface weather observations led the pilot to choose a different runway for landing.