Lecture 12ClassificationFormsCloud Genera (Types)CirrusCirrostratusCirrocumulus (“Mackerel Sky”)AltostratusAltocumulusSlide 10Slide 11StratusStratocumulusNimbostratusCumulus Humilis (“Fair-Weather Cumulus”)Cumulus Congestus (“Towering Cumulus”)Cumulonimbus (Thundercloud)Lecture 12Lecture 12Cloud TypesCloud TypesSee Ahrens, Ch. 4See Ahrens, Ch. 4ClassificationClassificationFormsFormsStratiformStratiformCumuliformCumuliformCirriformCirriformHeightHeightGenera, species, varieties (as in biology)Genera, species, varieties (as in biology)(Genera also called cloud “types”)(Genera also called cloud “types”)FormsFormsStratiform (like stratus)Stratiform (like stratus)Arranged in horizontal sheetsArranged in horizontal sheetsComes from Latin verb meaning “to spread out”Comes from Latin verb meaning “to spread out”Cumuliform (like cumulus)Cumuliform (like cumulus)““Rounded masses”Rounded masses”Comes from Latin verb meaning “to swell”Comes from Latin verb meaning “to swell”Cirriform (like cirrus)Cirriform (like cirrus)Fibrous; made of ice crystalsFibrous; made of ice crystalsFrom Latin: “lock of hair”From Latin: “lock of hair”Cloud Genera (Types)Cloud Genera (Types)High CloudsHigh CloudsCirrus (Ci), cirrostratus (Ci), cirrocumulus(Cc)Cirrus (Ci), cirrostratus (Ci), cirrocumulus(Cc)Middle-level CloudsMiddle-level CloudsAltostratus (As), altocumulus (Ac)Altostratus (As), altocumulus (Ac)Low CloudsLow CloudsStratus (St), nimbostratus (Ns), stratocumulus (Sc)Stratus (St), nimbostratus (Ns), stratocumulus (Sc)Clouds exhibiting extensive vertical developmentClouds exhibiting extensive vertical developmentCumulus(Cu), cumulonimbus (Cb)Cumulus(Cu), cumulonimbus (Cb)CirrusCirrusCirrostratusCirrostratusHaloCirrocumulus (“Mackerel Sky”)Cirrocumulus (“Mackerel Sky”)AltostratusAltostratusAltocumulusAltocumulusStratusStratusStratocumulusStratocumulusNimbostratusNimbostratusCumulus Humilis Cumulus Humilis (“Fair-Weather Cumulus”)(“Fair-Weather Cumulus”)Cumulus Congestus (“Towering Cumulus”)Cumulus Congestus (“Towering Cumulus”)Cumulonimbus (Thundercloud)Cumulonimbus