the.com/cold front
where warm air gets evicted by a colder, denser tenant with no notice
means The leading edge of a mass of cold air that pushes into and displaces warmer air, often bringing clouds, sharp temperature drops, wind shifts, and stormy weather as it passes.
from A compound of plain English parts. 'Cold' traces back through Old English 'cald,' a cousin of German 'kalt' and the root behind 'cool' and 'chill.' 'Front' comes via French from Latin 'frons,' meaning forehead or brow — literally the foremost face of a thing. The meteorological sense was borrowed straight from military language: forecasters in the early 20th century, notably the Norwegian school of meteorology after the First World War, imagined battling air masses meeting along a 'front,' as armies do. So a cold front is, quite literally, the advancing front line of an invading cold army.
- steep edge
- Cold air wedges underneath, shoving warm air violently upward
- on maps
- Blue line with triangles pointing where it's headed
- fast mover
- Travels nearly twice the speed of warm fronts
- storm maker
- Sudden lift spawns thunderstorms, gust fronts, sometimes tornadoes
- pressure dive
- Barometer drops, then jumps as the front passes
sydney dust storm 2009 — september 2009 cold front in australia that created massive red dust wall reaching 2km high over sydney