(“Nimbus” comes from the Latin word for “rain.”) Two examples are the nimbostratus or cumulonimbus clouds. Clouds that produce rain and snow fall into this category. The prefix “nimbo-” or the suffix “-nimbus” are low-level clouds that have their bases below 2,000 meters (6,500 feet) above the Earth. These clouds can forecast some of the most extreme weather, including heavy rain, hail, snow, thunderstorms, tornadoes and hurricanes. What cloud indicates an approaching bad weather?Ĭumulonimbus clouds – thunder clouds that have built up from cumulus clouds. They often stretch for miles across the sky and may have finger (non rotating) like clouds reaching toward the ground. (KEYC) – A shelf cloud is a long wedge shape cloud that forms on the leading edge of a squall line or multi-cluster storm system. This particular storm system was fed by a heat dome over the eastern United States. What’s a derecho storm?Ī derecho, pronounced deh-REY-cho, is a long-lived, fast-moving thunderstorm that causes widespread wind damage. Hail, high winds and tornadoes could accompany any severe thunderstorms that develop. Meaning: Strong thunderstorms are likely and severe storms are possible. These are sometimes called anvil clouds because of the way the upper-level winds shear the tops of the clouds and push them to one side. While they are not themselves dangerous, like a wall cloud, tail clouds are often indicative of severe weather and potential tornadic activity. They are often bent on an axis that is not quite horizontal and not quite vertical. Tail clouds look like a funnel or tornado in many ways. What do clouds look like before a tornado?
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