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  • Rogue's Gallery
    • Slide Show
    • Cumulus >
      • Cumulus
      • Cumulus Humilis
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      • A Thunderhead
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      • Nimbostratus
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      • Cirrostratus
      • Stratus Fractus
      • Sleepy Clouds
      • Grumpy Sea Fog
      • Radiation Fog
      • Sea Smoke
    • Cirrus >
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      • Cirrocumulus
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      • Contrails
    • Special Clouds >
      • Lenticular
      • Cap Cloud
      • Pileus
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      • Fallstreak Holes
      • Asperitas
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      • Morning Glory
      • Kelvin-Helmholtz
      • Nacerous
      • Noctilucent
  • Photos
    • Slide Show - Art in the Skies
    • The Cirrus Family photo album >
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    • The Cumulus Family Photo Album >
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    • The Stratus Family Photo Album >
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      • Cloud Colours
    • Cloudscape Photos
    • Clouds that look like things.
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  • Formation
    • Cloud Formation
    • Cloud Formation in a Nutshell
    • Orographic Cloud Formation
    • Formation of Stratus Cloud
    • A Warm Front
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    • Cloud Formation by Convection
    • A Cold Front
    • Formation of Lenticular Clouds
    • Formation of Cirrus Clouds
    • Formation of Ice Crystals
    • Formation of a Rainbow
  • Sayings
    • Head in the Clouds
    • He hasn't got the Foggiest!
    • Cloud Cuckoo Land
    • Thought Bubbles
    • A Storm in a Tea Cup
    • It's Raining Cats and Dogs
    • Snowed Under
    • Red Sky in the Morning...
    • Red Sky at Night...
    • If Clouds Look as if Scratched by a hen...
    • Mackerel Sky
    • The Pot of Gold....
  • Famous Clouds
    • Mt Fuji's Cap Cloud
    • Table Mountain's Table Cloth
    • The Matterhorn
    • Gibraltar's Levanter Cloud
    • A Grey Day in England
    • A London Pea Souper
    • Aotearoa
    • Morning Glory
    • A Foggy Day In San Francisco
    • Mid-West Stormcell
    • Mt Rainier's Lenticular
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Contrails

Contrails, short for condensation-trails, are man-made clouds formed when warm, moist exhaust air from jet engines cools to form ice crystals. While purist cloud spotters detest man’s intrusion into the romantic domain of clouds, they bring delight to the young at heart as they criss-cross the sky and are a useful weather forecasting tool for the more practically minded.
Usually, contrails will linger for a while then evaporate back into water vapour. If they hang about and spread out it is an indication of humid air at high altitudes which could mean there is bad weather on the way. There is speculation that contrails will hasten global warming by trapping heat in the atmosphere.
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