# weather (atmospheric)

the condition of air and water that changes over time in a place

- Computed level: L15 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: common  ·  Arena: weather

## Emergence
**Emerges from:** [air](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-air.material), [water](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-water.liquid), [energy](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-energy.capacity), [motion](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-motion.movement), [change](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-change.process), [condition](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-condition.state), [space](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-space.extent), [time](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-time.dimension)

**Through:** air and water, driven by energy and motion, interact and change over time, producing varying conditions in a place.

**Novel properties:**
- changing atmospheric states
- spatiotemporal variability
- dynamic weather patterns

## Examples
- Hurricane Katrina formed over the Gulf of Mexico on August 24, 2005, from warm seawater, atmospheric moisture, and wind shear. *(meteorology)*
- The 2010 eruption of Eyjafjallajökull in Iceland sent ash into the jet stream, grounding 100,000 flights across Europe. *(geophysics)*
- Chicago's 'Windy City' nickname reflects Lake Michigan's influence on local air currents and storm patterns. *(urban geography)*

## Used by
- [climate](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-climate.weather) (L16)

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*Canonical: https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-weather.atmospheric*  
*Structured data: https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-weather.atmospheric.json*  
*Every definition provably resolves to space, time, energy and pattern.*