Generate a random cloud type, from everyday genera to rare named phenomena, each drawn at its real altitude, for weather spotting, worldbuilding, or learning something new about the sky.
Clouds are classified by altitude and shape under a scheme Luke Howard proposed in 1802, which is why the names are Latin: cirrus for wispy, cumulus for heaped, stratus for layered, nimbus for raining. The terms combine, so cumulonimbus is a heaped raincloud and altostratus a mid-level sheet. Height bands separate high clouds of ice crystals, mid-level clouds around three to seven kilometres, and low clouds of water droplets. The shape reports what the air is doing -- flat layers mean stable air lifted gently, towering ones mean strong convection -- which is why cloud type forecasts weather rather than merely describing it.
This generator draws from a curated list of 30 real cloud types and named cloud phenomena across five categories -- High-Level Clouds, Mid-Level Clouds, Low-Level Clouds, Vertical Development, and Special & Rare Formations -- covering the ten official WMO cloud genera alongside notable named species, supplementary features, and optical phenomena.
Every result here is drawn using crypto.getRandomValues() -- the Web Crypto API's cryptographically secure randomness -- instead of Math.random(), so it's genuinely unpredictable, not just statistically random. Learn more.
Weather enthusiasts and students use it to learn or quiz themselves on cloud identification. Writers, artists, and photographers use it to spark a scene, a sky to paint, or a mood for a story. It's also a fun way to settle on a cloud-themed name for a project, or just learn something new about the sky next time you're looking up at it.
Generate draws one cloud type at random from the full 30-entry pool using the site's cryptographically secure randomness, guaranteed not to repeat whatever result is currently showing in single-result mode. Filtering by category narrows the pool before drawing, and each single result comes with a short description covering its appearance, how it forms, and what it signals about the weather.
A sample of what this generator can draw, spread evenly across the full list:
All 30 are real, recognized meteorological terms, including their descriptions -- nothing here is invented.
Yes -- use the filter button to pick one or more of the five categories. Generate will then only draw from clouds in the categories you've selected.
Not in single-result mode -- each new roll is guaranteed to differ from the one currently on screen.
Both -- all ten official WMO cloud genera (like Cirrus, Cumulus, and Cumulonimbus) are in the pool alongside named species, supplementary features, and rare optical phenomena like noctilucent clouds and lenticular clouds.
Weather Condition · Season · Natural Disaster · Atmospheric Phenomenon · Named Wind · Snowflake