the.com/fog

a cloud that lost its altitude and decided to ambush you instead

means a thick cloud of water droplets hanging at ground level, thick enough to blur or hide whatever lies ahead.

from English borrowed this in the 16th century, likely from a Scandinavian source — Danish and Norwegian have words like 'fog' and dialectal terms for spray, drizzle, and tall wet grass. The watery, blurry sense settled in quickly, and 'fog' soon spread metaphorically to anything that muddles the mind — the 'fog of war,' a memory lost in the 'fog.'

definition
Cloud touching the ground, by meteorology's count
thinnest reach
Just 200 meters visibility flips mist to fog
harvested
Mesh nets in Chile drink fog for water
deadliest
London's 1952 fog killed thousands in days
redwood secret
Coastal giants sip fog through their needles
for instance

great smog of london — killed ~12,000 people in december 1952, leading to the clean air act

tule fog california — dense fog in san joaquin valley causes ~150 car crashes annually

advection fog san francisco — cold pacific water creates karl the fog, famous weather phenomenon since 1950s

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