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Where is the Wind?

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hannah roesch

on 15 October 2012

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Transcript of Where is the Wind?

Where is the Wind? Wind is air in motion. It is produced
by the uneven heating of the earth’s
surface by the sun. Since the earth’s
surface is made of various land and
water formations, it absorbs the sun’s
radiation unevenly. Two factors are
necessary to specify wind: speed
and direction. What is wind? Wind is air in motion. It is produced by the
uneven heating of the earth’s surface by
the sun. Since the earth’s surface is made
of various land and water formations, it
absorbs the sun’s radiation unevenly. Two factors are necessary to specify wind: speed and direction. What Cause the Wind to Blow A windstorm is just a storm with high winds or violent gusts but little or no rain. What is a Windstorm? A gust front is the leading edge of cool air rushing down and out from a thunderstorm. There are two
main reasons why the air flows out of some thunderstorms so rapidly. The primary reason is the
presence of relatively dry air in the lower atmosphere. This dry air causes some of the rain falling through it to evaporate, which cools the air. Since cool air sinks (just as warm air rises), this causes a down-rush of air that spreads out at the ground. The edge of this rapidly spreading cool pool of air is the gust front. The second reason is that the falling precipitation produces a drag on the air, forcing it downward. If the wind following the gust front is intense and damaging, the windstorm is known as a downburst. What is a Gust Front? A derecho is a widespread and long-lived windstorm that is associated with a fast-moving band of
severe thunderstorms. They can produce significant damage to property and pose a serious threat
life, primarily by downburst winds. To be classified as a derecho, the path length of the storm has to
be at least 280 miles long. Widths may vary from 50-300 miles. Derechos are usually not associated
with a cold front, but a stationary front. They occur mostly in July, but can occur at anytime during the Spring and Summer. What is a Derecho? The jet stream is a fast flowing, river of air found in the atmosphere at around 12 km above the
surface of the Earth just under the tropopause. They form at the boundaries of adjacent air masses
with significant differences in temperature, such as of the polar region and the warmer air to the
south. Because of the effect of the Earth's rotation the streams flow west to east, propagating in a
serpentine or wave-like manner at lower speeds than that of the actual wind within the flow. What is the Jet stream? What is a Monsoon? A monsoon is a seasonal wind, found especially in Asia that reverses direction between summer and
winter and often brings heavy rains. In the summer, a high pressure area lies over the Indian Ocean
while a low exists over the Asian continent. The air masses move from the high pressure over the
ocean to the low over the continent, bringing moisture-laden air to south Asia. During winter, the
process is reversed and a low sits over the Indian Ocean while a high lies over the Tibetan plateau so
air flows down the Himalaya and south to the ocean. The migration of trade winds and westerlies
also contributes to the monsoons. Smaller monsoons take place in equatorial Africa, northern
Australia, and, to a lesser extent, in the southwestern United States. The equator receives the Sun's direct rays. Here, air
is heated and rises, leaving low pressure areas
behind. Moving to about thirty degrees north and
south of the equator, the warm air from the
equator begins to cool and sink. Between thirty
degrees latitude and the equator, most of the
cooling sinking air moves back to the equator.
The rest of the air flows toward the poles. What are Global Wind Patterns? Between thirty and sixty degrees latitude, the winds that move toward the poles appear to curve to the east. Because winds are named from the direction in which they originate, these winds are called prevailing westerlies. Prevailing westerlies in the Northern Hemisphere are responsible for many of the weather movements across the United States and Canada What are Prevailing Westerlies? At about sixty degrees latitude in both hemispheres, the prevailing westerlies join with the polar easterlies to reduce upward motion. The polar easterlies form when the atmosphere over the poles
cools. This cool air then sinks and spreads over the surface. As the air flows away from the poles, it is turned to the west by the Coriolis effect. Again, because these winds begin in the east, they are called easterlies. What are Polar Easterlies? Wind is the fastest growing source of electricity in the world. It's often one of the least expensive forms of renewable power available. Some experts say it can sometimes be the cheapest form of any kind of power. Generating power from the wind leaves no dangerous waste products behind. Best of
all, its supply is unlimited. How is Wind Helpful to Earth? Windmills work because they slow down the speed
of the wind. The wind flows over the airfoil
shaped blades causing lift, like the effect on
airplane wings, causing them to turn. The blades
are connected to a drive shaft that turns an electric
generator to produce electricity. How do Windmills Work? Many local wind systems have their own names. Here's a few!

chinook-(easterly off the Rocky Mountains)
santa ana-(easterly towards Southern California )
scirocco-(southerly from North Africa to southern Europe)
mistral-(northwesterly from central France to Mediterranean)
marin-(southeasterly from Mediterranean to France)
bora-(northeasterly from eastern Europe to Italy)
gregale-(northeasterly from Greece)
etesian-(northwesterly from Greece)
libeccio-(southwesterly towards Italy) What are Some Different Types of Wind Names Beaufort Scale The scale that carries Beaufort's name had a long and complex evolution,
from the previous work of others, including Daniel Defoe the century before,
to when Beaufort was a top administrator in the Royal Navy in the 1830s
when it was adopted officially and first used during the voyage of Charles Darwin on HMS Beagle. In the early 19th century, naval officers made regular weather observations, but there was no standard scale and so they could be very subjective — one man's "stiff breeze" might be another's "soft breeze".
Beaufort succeeded in standardizing the scale. In the United States, winds of force 6 or 7 result in the issuance of a small craft advisory, with force 8 or 9 winds bringing about a gale warning, force 10 or 11 a storm warning ("a tropical storm warning" being issued instead of the latter two if the winds relate to a tropical cyclone), and force 12 a hurricane force wind warning (or hurricane warning if related to a tropical cyclone). Today, many countries have stopped using the scale and started using the metric system based units, m/s or km/h, instead, but the severe weather warnings given to the public are still approximately the same as when using the Beaufort scale. Anemometers Wind velocity or speed is measured by a cup anemometer,
an instrument with three or four small hollow metal
hemispheres set so that they catch the wind and revolve
about a vertical rod. An electrical device records the
revolutions of the cups and calculates the wind velocity. In 1450, the Italian art architect Leon Battista Alberti invented the
first mechanical anemometer. This instrument consisted of a disk
placed perpendicular to the wind. It would rotate by the force of
the wind, and by the angle of inclination of the disk the wind force
momentary showed itself. The same type of anemometer was later
re-invented by Englishman Robert Hooke who is often mistakenly
considered the inventor of the first anemometer. The Mayans were
also building wind towers (anemometers) at the same time as Hooke. Anemometers can be divided into
two classes: those that measure the
wind's speed, and those that measure
the wind's pressure; but as there is
a close connection between the pressure
and the speed, an anemometer designed
for one will give information about both. A digital anemometer is commonly used across different
sectors such as the sea fishing industry, exhaust convulsions,
electricity and power generation, steel industry etc. Apart from
that, these anemometers are also useful in outdoor activities
such as trekking, hiking, camping among others. If the anemometer
comes equipped with add-on features such as temperature
tester and a wind pressure measurement apparatus, it proves
to be much more functional. A digital pressure gauge also helps
you accurately measure wind pressure, helping you plan outdoor
activities or events. (just thought this was
interesting, shows changes in technology) Digital Anemometers Birth Year : 1853
Death Year : 1890 Vincent Van Gogh The son of a pastor, brought up in a religious and
cultured atmosphere, Vincent was highly emotional
and lacked self-confidence. Between 1860 and 1880, when he finally decided to become an artist, van Gogh had had two unsuitable and unhappy romances and had worked unsuccessfully as a clerk in a bookstore, an art salesman, and a preacher in the Borinage (a dreary mining district in Belgium), where he was dismissed for over zealousness. Mental Instability Van Gogh had a brother in Paris who he soon joined.
Under the study of Cormon he met Pissarro Monet,
and Gauguin. He was influenced by the impressionists
enough to lighten his palette and begin to shorter
brushstrokes. His health began to decline because he stayed
up all night discussing with others and spent the
entire part of the day painting. Van Gough wanted to
go to Arles and start his own school of Art. Although
Gauguin joined him, he eventually had to leave Arles. "In May of 1890, he seemed much better and went to live
under the watchful eye of Dr. Gachet. Two months later
he shot himself "for the good of all." During his brief career
he had sold one painting. Van Gogh's finest works were produced
in less than three years in a technique that grew more and
more impassioned in brushstroke, in symbolic and intense color,
in surface tension, and in the movement and vibration of form
and line. Van Gogh's inimitable fusion of form and content is
powerful; dramatic, lyrically rhythmic, imaginative, and emotional, for
the artist was completely absorbed in the effort to explain either his
struggle against madness or his comprehension of the
spiritual essence of man and nature." Famous Technique Van Gogh suffered from temporal lobe epilepsy as well as other mental and physical conditions. Vincent shot himself in a wheatfield in France but did not die until 2 days later at the age of 37. Vincent’s brother Theo died six months after Vincent and is buried next to him in Auvers, France.
Vincent’s sister-in-law collected Vincent’s paintings and letters after his death and dedicated herself to getting his work the recognition it deserved. In a short period of ten years Van Gogh made approximately 900 paintings. Vincent only sold one painting during his lifetime and only became famous after his death. Vincent van Gogh did not cut off his ear. He only cut off a small portion of his ear lobe. Van Gogh created his most famous work The Starry Night while staying in an asylum in Saint-Remy-de-Provence, France. Vincent’s earliest career aspiration was to be a pastor in the Dutch Reformed Church like his father. Van Gogh wrote over 800 letters in his lifetime; the majority of them written to his brother and closest friend Theo. The Water Lily Pond
Monet Vincent Van Gogh Painting Sunflowers
Paul Gaugan Starry Night
Van Gogh Wheatfield With a Lark A Wind Beaten Tree Torrents of Rain and Gusts of Wind
MIllet Women Mending Nets in the Dunes Beach
at Scheveningen in stormy Weather
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