Definition
Any structured arrangement of atmospheric phenomena — such as cloud layers, fog banks, frontal systems, or precipitation areas — that has identifiable shape, extent, and behavior in the atmosphere.
Plain English
A weather feature with a recognizable shape and size, like a layer of clouds, a fog bank, a thunderstorm, or a line of showers.
Context Anchor
Seen in instrument weather flying discussions, especially when deciding whether VFR-on-top flight can be conducted while staying clear of clouds and other visible weather areas.
Derivation
Meteorological comes from the Greek 'meteoron,' meaning 'thing high up' — originally referring to anything observed in the sky. Formation here means a shaped or organized structure. Together: a shaped weather feature in the sky.
Why Pilots Care
Ensures legal VFR cloud separation and safe visual reference while on an IFR flight plan.
Grounding Statement
Picture a solid-looking layer of clouds below the aircraft or a bank of fog ahead; that visible weather area is a meteorological formation.
Intuition Check
Do not read formation here as aircraft flying in formation. In this context, it means a weather feature or weather area that has formed in the atmosphere.
Example Sentence 1
Before climbing to VFR-on-top, the pilot studied the meteorological formation ahead to confirm the cloud layer had a defined top and would not build into his cruise altitude.
Example Sentence 2
Maintaining the required distance from the meteorological formation kept the flight in legal VFR conditions.