John, these wavy bottom clouds are an indication of cold air descending and warm air rising, so watch out for possible severe weather. Head for safety! NOAA says, "Mammatus clouds are actually altocumulus, cirrus, cumulonimbus, or other types of clouds that have these pouch-like shapes hanging out of the bottom."
John, these wavy bottom clouds are an indication of cold air descending and warm air rising, so watch out for possible severe weather. Head for safety! NOAA says, "Mammatus clouds are actually altocumulus, cirrus, cumulonimbus, or other types of clouds that have these pouch-like shapes hanging out of the bottom."
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