Alpha Kappa Alpha Letter Of Interest

as the Hail?

• What is hail?

would be generated and evolve an atmospheric phenomenon to become hail should be given certain conditions and circumstances, which are processes that must be fulfilled without equanum (inclusive) to result in this type of precipitation.

Hail forms only in the Cumulonimbus (clouds with a very flat top) that are highly developed. They can reach fifteen thousand feet, and in addition to hail, are responsible for originating storms and tornadoes.

• hail formation process.

When air currents ascend to heaven in a very violent, the water droplets freeze into ice after ascending to the higher elevations of the cloud (where the temperature is at least 0 degrees Celsius). As time passes, the water droplets earn dimensions that are dense enough to be unstoppable and stay longer in suspension. That's when it happens to fall in between the cloud droplets taking with it finds in its path.

As the ice crystals are stirred restlessly, rub each other, and merging, and polishing their surfaces, making spherical bodies, often in quite perfect. A piece of hail of 3 cm in diameter, has a volume of 10,000 million times larger than a cloud droplet (diameter of a cloud droplet average: 10 to 20 microns). In other words, they must collect some 10,000 million droplets to form a piece of hail of 3 cm in diameter. In the larger stones are alternately transparent ice and opaque ice.
is noteworthy to understand that it is like a conveyor belt driven by strong winds upward, bringing the liquid water to cool it so that it condenses and then freezes every drop adding layers individually frozen until fall under its own weight.
The rate of decline varies in proportion not only the weight of the hailstones, but the storm that is happening around.

• Geographic Distribution.

occurs worldwide, especially in middle latitudes. Cause much destruction in rural areas, can cause partial or total loss of crops. In Argentina the most frequent sites ...

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... are related to the eastern foothills of the central Andes of Mendoza, the Sierras of Cordoba, Aconquija system. In the area of the Pampas plains occurs in situations where dominant surface warm, moist air to flow inputs cold air height and situations to the continent of very cold air masses.


Unusual hail in Buenos Aires. July 26, 2006.

• Occurrence of hailstones.

To produce hail precipitation must be certain atmospheric conditions, such as: the atmosphere must be unstable, ie, there must be temperature and humidity conditions that enable the development of thunderstorms, with strong updrafts. In an unstable atmosphere, a certain amount of air to rise continues to accelerate in the same direction. Sometimes, the acceleration continues until the air reaches the base of the stratosphere. Thus, formation of large and violent storms, producing heavy rains, lightning and sometimes hail.
Some researchers have suggested that a critical parameter would be the height that is the isotherm of 0 ° C, with respect to the base of the cloud. In general it was observed that the production of hail is more common it is lower that isotherm. Updrafts and downdrafts, allowing ice particles growth, remain in a storm long enough to reach a large size. In the vertical motion, are running up and down with very high speeds. It is assumed that current speeds can exceed 100 m / s (360 km / h).

• Fuentes.

http://www.sis-antigranizo.com.ar/index.htm
http://www.mailxmail.com/curso/excelencia/meteorologia/capitulo23.htm ...
http://es.wikipedia.org/wiki/Granizo
http://www.smn.gov.ar/