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Footprint Blog - Google Carbon Footprint Choose a quiz to take. Blog the following: 1. The url of your site as a link. 2. Is it a good site for you? Younger kids? 3. What...

Thursday, September 30, 2010

pp google docs link

https://docs.google.com/present/edit?id=0AVyKyW_e8-HyZGdxNGIyOWdfMGR3cTdzdmtu&hl=en

Posted by bmxster31893 at 9:57 AM

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Climate Research Project

Climate Research Project: Hail

Hail is a form of solid precipitation which consists of balls or irregular lumps of ice, that are individually called hail stones. Hail stones on Earth consist mostly of water ice and measure between 5 millimeters (0.20 in) and 150 millimeters (5.9 in) in diameter, with the larger stones coming from sever thunderstorms. Hail is possible with most thunderstorms as it is produced by cumulonimbi (thunderclouds). Hail is possible within 2 miles (3.7 km) of its parent thunderstorm. Hail formation requires environments of strong, upward motion of air with the parent thunderstorm and lowered heights of the freezing level. Unlike ice pellets, hail stones are layered and can be irregular and clumped together. Hail is composed of transparent ice or alternating layers of transparent and translucent ice at least 1 millimeter (0.039 in) thick, which are deposited upon the hail stone as it cycles through the cloud multiple times, suspended aloft by air with strong upward motion until its weight overcomes the updraft and falls to the ground. There are methods available to detect hail-producing thunderstorms using weather satellites and radar imagery. Hail stones generally fall at faster rates as they grow in size, though complicating factors such as melting, friction with air, wind, and interaction with rain and other hail stones can slow down their descent through Earth's atmosphere. Severe weather warnings are issued for hail when the stones reach a damaging size, as it can cause serious damage to man-made structures, and most commonly, farmers' crops. In the United States, the National Weather Service issues severe thunderstorm warnings for hail 1" or greater in diameter. This threshold, effective January 2010, marked an increase over the previous threshold of 3/4" hail. The change was made for two main reasons: a) public complacency and, b) recent research suggesting that damage does not occur until a hailstone reaches 1" in diameter.

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