Definition
Distinct horizontal layers of the atmosphere, each with relatively uniform properties such as temperature, moisture, or air density, stacked at different altitudes.
Plain English
Layers of air sitting on top of one another, each behaving a little differently from the one above or below it.
Context Anchor
Seen in discussions of airways, airspace structure, and how aircraft are organized at different altitudes.
Derivation
From the Latin 'stratum,' meaning 'something spread out' or 'a layer.' The same root gives us 'stratus' clouds (flat, layered clouds). It helps to picture the atmosphere as a stack of spread-out sheets rather than one uniform mass.
Why Pilots Care
Understanding strata helps pilots evaluate visibility, icing, and turbulence risks when choosing altitudes along an airway.
Analogy
Think of the atmosphere like a layer cake — each stratum is one layer, and conditions can change noticeably as you climb from one layer into the next.
Grounding Statement
Picture the air above you as a stack of invisible layers, with aircraft and procedures organized differently in different layers.
Intuition Check
Do not read strata as one airway or one route. Strata means layers; in this context, it means layers of airspace or atmosphere, usually separated by altitude.
Example Sentence 1
Airways are designed to route traffic efficiently through different strata of the airspace system.
Example Sentence 2
The pilot selected an altitude that avoided the reported icing strata.