Before the storm, meteorologists predicted falls of a mixture of snow, ice pellets and freezing rain from two storm systems from Texas and the Great Lakes.
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Sleet, a more common form of winter precipitation, occurs when rain falls through a layer of subfreezing air near the ground and freezes into tiny ice pellets.
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It uses a cage of dry ice pellets which are lowered into a bath of hot water ( which is kept hot via an internal heating element ).
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Precipitation that reaches the surface of the earth can occur in many different forms, including rain, freezing rain, drizzle, ice needles, snow, ice pellets or sleet, graupel and hail.
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A batch of wintry precipitation, mainly in the form of ice pellets, moved across northern Texas on Thursday morning as a potent jet stream disturbance approached from eastern New Mexico.
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The constant shelling of ice pellets and freezing rain transformed that part of the country into a frigid landscape of ice, exceedingly beautiful to look at but laden with deadly consequences.
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The typically low levels of noticeable ice pellets, snow, or sleet surrounding black ice means that areas of the ice are often practically invisible to drivers or people stepping on it.
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They frequently come with a volatile mix of snow, ice pellets, freezing rain and sometimes just ordinary rain, all of which can disrupt transportation, and in severe cases, interrupt power supply.
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While snow and ice pellets require temperatures to be near or below freezing at the surface, hail can occur during much warmer temperature regimes due to the process of its formation.
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Graupel is distinct from hail, small hail and ice pellets : the World Meteorological Organization defines small hail as snow pellets encapsulated by ice, a precipitation halfway between graupel and hail.