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The 'mountain wave' is an atmospheric standing wave downstream of mountains — it can reach 40,000 feet altitude.
A brinicle (brine icicle) forms when super-cold, salty water sinks from sea ice and freezes the surrounding seawater.
Heat lightning is ordinary lightning from a storm too far away for thunder to be heard.
Permafrost 'pingos' — ice-cored hills — can grow several meters in height and eventually explode as they melt.
The mesosphere is too high for aircraft and too low for satellites — it's the least-explored layer of the atmosphere.
Sea foam is produced when dissolved organic matter in the ocean is agitated by waves and wind.
A circumzenithal arc is a rainbow-colored arc near the zenith (directly overhead) — it's the 'smile in the sky.'
Earthquake lights — glowing orbs seen before or during earthquakes — have been documented but not fully explained.
Kelvin-Helmholtz clouds look like breaking ocean waves — they form at the interface of two air masses moving at different speeds.
The smell of rain (petrichor) is geosmin released by actinobacteria and ozone formed by lightning.
Snow rollers form in rare weather conditions — wind blows a snow cylinder that picks up more snow as it rolls.
Crepuscular rays — beams of sunlight through clouds — appear to radiate from the sun but are actually parallel.
The Hessdalen lights of Norway — unexplained glowing orbs — have been documented and photographed since the 1930s.
Halos around the moon are caused by ice crystals in high-altitude cirrus clouds refracting moonlight.
Noctilucent clouds form at 75–85 km altitude — they're visible at night and are made of ice crystals seeded on meteoric dust.
A pyrocumulus cloud can form above large wildfires — the heat creates its own thunderstorm that can produce dry lightning.
The 'Mpemba effect' — hot water freezing faster than cold — remains controversial, but has been reproduced under specific conditions.
Underwater rivers of denser saltwater flow along the ocean floor — carrying sediment and nutrients thousands of miles.
Fire rainbows (circumhorizontal arcs) form when sunlight passes through horizontally oriented ice crystals at a precise angle.
The phenomenon of sun dogs (parhelia) creates bright spots flanking the sun, caused by ice crystal refraction.
Anticrepuscular rays appear on the horizon opposite the sun — they seem to converge due to perspective.
A haboob is a massive dust storm common in the Sahara and American Southwest — it can reduce visibility to zero.
St. Elmo's Fire is a plasma glow around ship masts and aircraft during thunderstorms — mistaken for supernatural fire.
The 'ghost apple' phenomenon occurs when freezing rain encases an apple in ice that remains after the apple rots.
Cave pearls form when water drips onto a grain of sand, depositing concentric layers of calcite over thousands of years.
Raining fish is a documented phenomenon — tornadoes can lift fish from water bodies and deposit them miles away.
The Fata Morgana is a complex mirage that inverts and layers images — it inspired legends of flying castles.
Dust devils are small, short-lived whirlwinds of dust — they're common on Mars and much larger there.
The 'green flash' is a real optical phenomenon — a brief green ray visible at the horizon as the sun sets.
Blood rain — red rainfall — has been recorded across Europe, caused by airborne algae or dust from the Sahara.
Ice circles — perfect rotating discs of ice — form in slow-moving rivers during cold winters.
Morning glory clouds in Australia's Gulf of Carpentaria are rare, rolling tube-shaped clouds up to 1,000 km long.
The 'singing sands' phenomenon occurs when dry, clean quartz grains slide over each other in specific conditions.
Lenticular clouds form over mountains and look exactly like UFOs — smooth, lens-shaped, and stationary.
Volcanic lightning is caused by static electricity from ash particles colliding during eruption.
A moonbow (lunar rainbow) is a rainbow created by moonlight — seen at night near waterfalls.
Fogbows are white rainbows formed when droplets in fog are too small to separate colors.
Petrified wood forms when wood is replaced atom by atom with minerals over thousands of years.
A fire whirl (fire tornado) forms when fire creates its own convection column that begins to rotate.
The Catatumbo lightning over a Venezuelan lake averages 28 lightning strikes per minute — nearly year-round.
Sprites and elves are electrical discharges above thunderstorms — only discovered in 1989.
A microburst is a sudden downdraft from a thunderstorm — it can bring a plane down on approach.
Bioluminescent bays in Puerto Rico and the Maldives glow blue when disturbed — caused by dinoflagellates.
The Eye of the Sahara (Richat Structure) is a giant geologic dome 50 km wide — visible from space.
The highest recorded wave height was 524 meters — in Lituya Bay, Alaska in 1958, caused by a landslide.
A waterspout is a tornado over water — they can reach heights of 5 km and travel for over an hour.
Lightning strikes Earth about 100 times per second — producing 44 billion bolts per year.
The northern lights (aurora borealis) are caused by charged solar particles exciting atmospheric gases.
Ball lightning — glowing spheres of light that float through the air — is real but poorly understood scientifically.
Autonomous vehicles have driven billions of miles in testing — but haven't achieved the reliability of human drivers in all conditions.