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" ... Clouds with pouch-like downward extensions associated with very active cumulonimbus in latter stages of development. Mammatus occurs when air from the cloud layer descends into the clear air below and the cloud droplets evaporate, cooling down the air and making it descend even faster. Some of the cloud is dragged down, creating the appearance. ... "
" ... For Roubini, the storm clouds are gathering for a disorderly unwinding in the eurozone with a Greek exit and significant contagion to other fragile periphery members, namely Spain. There's also dark cumulonimbus clouds on the U.S. horizon, with growth slowing to stall speed from this year's expected 2.5% GDP rate. ... "
" ... Let's discuss the meteorology first. Volcanic eruptions inject, rapidly, quite a bit of heat and particulate matter into the atmosphere. Such particulate matter is often water-attracting and can lead to formation of clouds. All clouds form on some type of condensation nucleus or "seed." If there is sufficient lift or instability (local parcels of air are more buoyant than the surrounding air, e.g., think hot air balloon on cool morning) to keep moist air rising, deep cumulonimbus clouds can form with heavy rainfall and lightning. Often these deep thunderclouds are visible from space. With the Mount Aso eruption, visible satellites indicated that existing clouds may have obscured the volcanic-induced clouds. Lightning from volcanic eruptions can also provide quite the fireworks show. Brentwood Higman writes on Geology.com concerning volcanic lightning that: ... "
" ... Where you have fast-moving winds over the warm ocean, the air heats up, absorbs moisture, and rises. The warmer the water and the faster the air just above the surface moves, the faster the water evaporates, turns into water vapor, and then rises. The air and the vapor within it cool as the air rises, and eventually the vapor condenses back into clouds. Where there's lots of moving air over warm water, there's lots of moisture rising, and hence, thicker clouds. These cumulonimbus clouds (or, more commonly, rain clouds) will "stack" on top of one another, rising higher and higher, creating the origins of a tropical disturbance. ... "