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4 0 3 . 0 2. Clouds. Cumulus form in rising air currents and indicate unstable air. Stratus form in horizontal layers and indicate stable air. CLOUDS. Families:. Height of Bases:. LOW (STRATO) surface - 6,500ft MIDDLE (ALTO) 6,500ft - 23,000ft
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4 0 3 . 0 2 Clouds
Cumulus form in rising air currents and indicate unstable air Stratus form in horizontal layers and indicate stable air CLOUDS
Families: Height of Bases: • LOW (STRATO) surface - 6,500ft • MIDDLE (ALTO) 6,500ft - 23,000ft • HIGH (CIRRO) 16,500ft - 45,000ft • VERTICAL 1,500ft - above DEVELOPMENT
CIRRUS (CI) • Thin delicate wisps
CIRRO-CUMULUS (CC) • Thin cottonball like
CIRRO-STRATUS (CS) • Thin high sheet • Produces “Halo” effect • Often indicates the approach of a warm front
ALTOCUMULUS (AC) • Layers of rounded masses of cloud
ALTOSTRATUS (AS) • Thick grey clouds that often cover the entire sky • May give some light rain or snow
ALTOCUMULUS CASTELLANUS (ACC) • Altocumulus with turrets
Confirmation Stage NOTE: You must use the buttons in the Confirmation Stage
Meteorology Clouds Let's try a few review questions on Meteorology: Question #1 - What is the height of middle clouds? A 1,500-6500 feet B 6,500-23,000 feet C 16,500-45,000 feet D 23,000-45,000 feet
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Meteorology Clouds Let's try a few review questions on Meteorology: Question #2 - What type of cloud produces a halo effect? A Altostratus B Altocumulus Castellanus C Cirrostratus D Cirrocumulus
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STRATUS (ST) • A uniform layer, like fog, but not resting on the ground • Drizzle often falls from stratus
STRATUS FRACTUS (SF) • Pieces of Stratus
STRATOCUMULUS (SC) • A thin layer of rounded masses of cloud
NIMBOSTRATUS (NS) • A low layer of uniform, dark grey cloud
CLOUDS OF VERTICAL DEVELOPMENT
CUMULUS (CU) • Thick • Rounded and lumpy • Resemble cotton balls
Cumulus Fractus (CF) • Broken Cumulus
TOWERING CUMULUS (TCU) • Cumulus that builds up into high towering masses • Rough air underneath • Heavy icing in cloud
CUMULONIMBUS (CB) • Heavy masses of cumulus • Anvil top • Violent vertical currents • CB clouds should be avoided by all aircraft
Clouds of Vertical Development • bases as low as 1,500 feet • composed of: • water droplets • supercooled water droplets • ice crystals.
Confirmation Stage NOTE: You must use the buttons in the Confirmation Stage
Meteorology Clouds Let's try a few review questions on Meteorology: Question #3 - What are clouds of vertical development composed of? A Water droplets B Ice crystals C Supercooled water droplets D All the above
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Meteorology Clouds Let's try a few review questions on Meteorology: Question #4 - What cloud is thick gray and often covers the entire sky? A Altostratus B Cirrus C Altocumulus D Cirrostratus
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Meteorology Clouds Congratulations!! You have now completed the Clouds lesson of the Meteorology Module. Of course, this lesson is always available to you for future reference if required. You are now ready to move along to the next Meteorology lesson you have not completed or to any other module you wish. You can advance to the Self Test Module if you feel ready to challenge the final exam. Good Luck!