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  2. Climate of Illinois - Wikipedia

    en.wikipedia.org/wiki/Climate_of_Illinois

    Köppen climate types of Illinois (with counties overlaid), using 1991-2020 climate normals. The Climate of Illinois describes the weather conditions, and extremes, noted within the state of Illinois, United States, over time. Because of its nearly 400-mile (640 km) length and mid-continental location, Illinois has a widely varying climate.

  3. Altocumulus cloud - Wikipedia

    en.wikipedia.org/wiki/Altocumulus_cloud

    Altocumulus (from Latin altus 'high' and cumulus 'heaped') [1] is a middle-altitude cloud genus that belongs mainly to the stratocumuliform physical category, characterized by globular masses or rolls in layers or patches – the individual elements being larger and darker than those of cirrocumulus and smaller than those of stratocumulus. [2]

  4. Mackerel sky - Wikipedia

    en.wikipedia.org/wiki/Mackerel_sky

    When these high clouds progressively invade the sky and the barometric pressure begins to fall, precipitation associated with the disturbance is likely about 6 to 12 hours away. A thickening and lowering of cirrocumulus into middle-étage altostratus or altocumulus is a good sign that the warm front or low front has moved closer and it may ...

  5. List of cloud types - Wikipedia

    en.wikipedia.org/wiki/List_of_cloud_types

    Mid-level stratocumuliform clouds of the genus altocumulus are not always associated with a weather front but can still bring precipitation, usually in the form of virga which does not reach the ground. Layered forms of altocumulus are generally an indicator of limited convective instability, and are therefore mainly stratocumuliform in structure.

  6. Altocumulus undulatus cloud - Wikipedia

    en.wikipedia.org/wiki/Altocumulus_undulatus_cloud

    The altocumulus undulatus is a mid-level cloud (about 8,000–20,000 ft or 2,400–6,100 m), usually white or grey with layers or patches containing undulations that resemble "waves" or "ripples" in water.

  7. Altocumulus volutus - Wikipedia

    en.wikipedia.org/wiki/Altocumulus_volutus

    Altocumulus volutus is a type of altocumulus cloud. This cloud type has the appearance of a single, small, horizontal, rolling line, it is relatively rare compared with its counterpart stratocumulus volutus, [1] This cloud does not attach to any other cloud. It may or may not appear with altocumulus clouds of different species.

  8. Altocumulus castellanus cloud - Wikipedia

    en.wikipedia.org/wiki/Altocumulus_castellanus_cloud

    The base of the cloud can form as low as 2,000 metres (6,500 feet), or as high as 6,000 metres (20,000 feet). They are very similar to cumulus congestus clouds, but at a higher level and with the cloud heaps joined at the base. Castellanus clouds are evidence of mid-atmospheric instability and a high mid-altitude lapse rate. [2]

  9. Altostratus cloud - Wikipedia

    en.wikipedia.org/wiki/Altostratus_cloud

    Altocumulus clouds are small patches or heaps of white or light gray cloud. [49] [4] Like altostratus, altocumulus are composed of a mixture of water droplets, supercooled water droplets, and ice crystals. Although altocumulus clouds are mid-level clouds that form at roughly the same altitude as altostratus clouds, their formation methods are ...