A Quick Introduction to Clouds Lis Cohen

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Presentation transcript:

A Quick Introduction to Clouds Lis Cohen

Cloud Naming Cloud naming is based on four cloud characteristics and three cloud levels There are about 30 distinct cloud types Professionals may use 10, a casual observer 3 or 4

Cloud Characteristics Cirrus – Fiber or Hair Cumulus –Heaped or Piled

Cloud Characteristics Stratus – Sheet or Layer Nimbus – Rain Making

Cloud Levels High Cumulus –Size of top of thumb at arms length Low Cumulus –Size of fist at arms length Photo: WBZ-Mos

Cloud Levels High Stratus –Sun and Moon easily seen Low Stratus –Sun and Moon difficult to see

Cloud Levels High Clouds Generally form above 20,000 feet Usually appear white, except for sunrise/set Usually thin and composed almost exclusively of ice crystals

Cloud Levels High Clouds Indicative of upper level moisture (storms possible in 6-24 hours).

Cloud Levels High Clouds CIRRUS CIRROSTRATUS CIRROCUMULUS Photo: WBZ-Mos

Cloud Levels Middle Clouds Cloud bases are located between 6,500-23,000 feet in the mid-latitudes Composed of water droplets and when temperatures are low enough, some ice crystals

Cloud Levels Middle Clouds ALTOSTRATUS ALTOCUMULUS

Possible marker of PM t-storms when seen in the AM with greater vertical development. (Clouds form in unstable air with stable air above them.) Cloud Levels Middle Clouds

Cloud Levels Low Clouds Cloud base lies below 6,500 feet Almost always composed of water droplets, but in cold weather, may contain ice particles and snow

Cloud Levels Low Clouds Stratus Stratocumulus Nimbostratus Museum of Science/WBZ conference

Cloud Levels Low Clouds Can form drizzle like precipitation Often stable layer is found above these clouds

Cloud Levels Large Vertical Development CUMULUS CUMULONIMBUS

Cumulus Humulis Cumulus Fractus Cloud Levels Large Vertical Development Photographer: Unknown

Cumulus Congestus Cumulonimbus Incus Cloud Levels Large Vertical Development Photographer: Unknown

Occurs with an unstable atmosphere Often indicative of thunderstorms and heavy rain Cloud Levels Large Vertical Development

Unique Clouds Lenticular Clouds Pileus Clouds Photographer: Unknown Photographer: Jay Shafer

Unique Clouds Mammatus Clouds Condensation Trail or Contrail Photographer: Unknown

Common Cloud Types

Description of Sky Conditions SUNNY OR CLEAR less than 1/10 sky covered by clouds PARTLY CLOUDY/ PARTLY SUNNY 1/10 to 5/10 of sky is covered by clouds

Description of Sky Conditions MOSTLY CLOUDY (MOSTLY SUNNY) 6/10 to 9/10 of sky is covered by clouds (sun) OVERCAST more than 9/10 of the sky is covered in clouds Undercast

Cloud Naming