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A hydrometeor is an atmospheric phenomenon caused by the presence of water vapour in the air.

Classification

Even if popularly hydrometeor is synonymous with precipitation, the latter should indicate only hydrometeors falling from the sky.

This is the scheme created by the German meteorologist Gustav Hellmann (with some modifications):

Direct condensation of water vapour near the surface

Liquid

  • Sweat
  • Dew
  • Mist waters
  • Wet fog
  • Fog drip
  • "Rain without clouds"

Solid

  • Frost sweat
  • White dew
  • Freezing fog
  • Ice fog
  • Soft rime
  • Hard rime
  • Diamond dust

Direct condensation of vapour in the air

Liquid

Solid

Indirect condensation of vapour in the air

Liquid

Solid

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