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Ice crystals have a preference to form hexagonal structures by deposition, but can form odd shapes in the presence riming or aggregation into graupel. The shape of ice particles is mostly dependent on the temperature and supersaturation where they form. The supersaturation is mostly dependent upon the speed in the updraft regions. In regions of ...
Finally, sea-levels are rising, mainly due to a combination of melting glaciers and ice sheets, and the fact that warmer water takes up more space. Local factors can also play a part. Local ...
The second has to do with meteorological winter which varies with latitude for a start date. [1] Winter is often defined by meteorologists to be the three calendar months with the lowest average temperatures. Since both definitions span the start of the calendar year, it is possible to have a winter storm occur two different years.
An avalanche can occur with a sudden thermal or mechanical impact on snow that has accumulated on a mountain, which causes the snow to rush downhill suddenly. Preceding an avalanche is a phenomenon known as an avalanche wind caused by the approaching avalanche itself, which adds to its destructive potential. [ 84 ]
NOAA also projects the proportion of hurricanes that reach the most intense levels — Category 4 or 5 — could rise by about 10% this century. To date, less than a fifth of storms have reached ...
• Hurricanes occur regularly in every basin except the South Atlantic and southeast Pacific, where wind shear, or winds that vary in strength or direction with altitude and disrupt tropical ...
A tropical cyclone is the generic term for a warm-cored, non-frontal synoptic-scale low-pressure system over tropical or subtropical waters around the world. [4] [5] The systems generally have a well-defined center which is surrounded by deep atmospheric convection and a closed wind circulation at the surface. [4]
It may be marked by significant disruptions to normal conditions such as strong wind, hail, thunder and lightning (a thunderstorm), heavy precipitation (snowstorm, rainstorm), heavy freezing rain (ice storm), strong winds (tropical cyclone, windstorm), or wind transporting some substance through the atmosphere such as sand or debris.