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Topic: Jet stream

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	Jet stream - Wikipedia, the free encyclopedia
		In the Northern Hemisphere the streams are most commonly found between latitudes 30°N and 70°N for the polar jet stream, and between latitude 20°N and 50°N for the subtropical stream.
		The jet streams were first discovered by the Japanese meteorologist Wasaburo Ooishi in the 1920s by the tracking of weather balloons.
		Associated with Jet Streams is a phenomenon known as Clear air turbulence, which is the result of massive disturbances of air, caused by vertical and horizontal windshear connected to the Jet Streams.
	en.wikipedia.org /wiki/Jet_stream (741 words)

	RIDDING THE JET STREAM (Site not responding. Last check: 2007-10-18)
		During winter, the jet core is located generally closer to 300 millibars since the air is more cold and dense in the vicinity of the jet stream during the cool season.
		The jet stream is useful for the prediction of temperature.
		The jet stream divides colder air to the north from warmer air to the south.
	www.theweatherprediction.com /habyhints/100 (396 words)

	Jet Stream
		Jet streams are bands of very strong winds which occur at limited altitudes (generally in the 30-40000 feet area).
		The jet stream is a river of fast flowing air at high altitudes above the earth that generally flows from west to east over the mid-latitudes.
		To be called a "jet stream" the winds should be faster than 57 mph, but the term is often wrongly used for all upper-level winds.
	www.crystalinks.com /jetstream.html (428 words)

	Jet Stream: current of rapidly moving air
		The jet stream is a current of fast moving air found in the upper levels of the atmosphere.
		Jet streams are usually found somewhere between 10-15 km (6-9 miles) above the earth's surface.
		The yellow, green and red ribbon on the image above represents the jet stream, and along the East Coast, the region of strongest winds (shaded in red) is a jet streak.
	ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/cyc/upa/jet.rxml (207 words)

	Jet Stream
		The jet stream is the comparatively narrow current of air that moves around the Northern and Southern Hemispheres of the Earth in wavelike patterns.
		This jet stream originates in the upper troposphere near Burma and extends to the west of Africa, some 6,000 miles (10,000 kilometers) to the west.
		While the exact relationship is still unknown, meteorologists agree that jet streams may act as a barrier between cold air in the north and warm air in the south.
	www.centennialofflight.gov /essay/Dictionary/Jet_Stream/DI68.htm (325 words)

	Stream (disambiguation) - Wikipedia, the free encyclopedia
		The primary meaning of stream is a moving body of water, confined within a bed and banks and having a detectable current.
		High speed streams of air in the upper atmosphere are called jet streams.
		Stream is also a planet in the fictional Star Ocean universe, sometimes referred to as Planet Styx.
	en.wikipedia.org /wiki/Stream_(disambiguation) (215 words)

	Jet Stream (Site not responding. Last check: 2007-10-18)
		The jet stream is a current of fast moving air found in the upper levels of the troposphere which blow from west to east due to the Earth's rotation.
		The position of the jet stream denotes the location of the strongest temperature contrasts between different latitudes on the Earth surface.
		There are two main jet streams - the subtropical jet stream at about 30 degrees latitude and the polar jet stream at about 60 degrees latitude.
	www.ace.mmu.ac.uk /eae/Atmosphere/Older/Jet_Stream.html (147 words)

	CRWS Background Information: Jet Stream Maps
		Often, two such jet streams might be visible on these maps: (1) a polar jet stream (generally within the mid-latitudes); and (2) a subtropical jet stream (generally within the subtropics, between roughly 23.5° and around 33° latitude).
		The jet streams powerfully influence synoptic-scale weather patterns in the mid-latitudes.
		The regions of convergence and divergence within the jet stream pattern--and the patterns of clear and stormy weather associated with the regions of convergence and divergence--are strongly correlated with certain parts of the wobbles.
	squall.sfsu.edu /crws/map_info/jetstream_info.html (897 words)

	NOVA Online \| Balloon Race Around The World \| The Jet Stream
		The jet stream, one of the most dramatic forces of nature, was discovered during World War II when aviators first tried to cross the Pacific.
		The greater the contrasts in surface temperature, the stronger the jet stream winds blow.
		Because the jet stream winds are greatly affected by changes in temperature, their trajectory does not always flow in a uniform west to east direction.
	www.pbs.org /wgbh/nova/balloon/science/jetstream.html (343 words)

	The Weather Notebook: Jet Stream (Site not responding. Last check: 2007-10-18)
		Jet stream speeds of about 75 mph in winter and 35 mph in summer are typical, though the jet has been clocked at 200 mph.
		The jet stream is propelled by the contrast in temperature and air pressure between the equator and the poles.
		If the jet streams ran straight like lines of latitude our weather would be extremely monotonous; but, for better or worse, the unevenness in temperature and the disruptive presence of land masses cause the jets to meander in giant dives and ascents.
	www.weathernotebook.org /transcripts/2001/01/05.html (311 words)

	USATODAY.com (Site not responding. Last check: 2007-10-18)
		The term "jet stream" is often used to refer to the rivers of wind high in the atmosphere - above about 20,000 feet - that steer storms.
		Jet streams form along the upper air boundaries of large masses of warm and cold air.
		While the term "jet stream" refers to high-altitude winds, meteorologists also talk about "low-level jet," which are high-speed winds that might be only a few hundred feet above the surface.
	www.usatoday.com /weather/tg/wjstream/wjstream.htm (258 words)

	The Influential Jet Stream
		The Polar jet streams are the most prominent and are year round events while the Sub-Tropical jet streams and the Tropical jet Stream are more prominent when it is summer in the Northern hemisphere.
		These Jet Streams are located 50°-60° North/South of the equator and at 35,000 Feet (About 6.6 Miles), is a powerful, current of wind that acts as a boundary line, separating the extremely cold polar air (North) from the warm sub-tropical air (South).
		These strong jet streams are located at about 30° North/South of the equator at a height of about 41,000 feet (About 8.1 Miles) and along with the Polar Jet Stream is responsible for many types of weather patterns, depending on the time of the year.
	www.cubanology.com /Articles/Influential_Jet_Stream.htm (1539 words)

	Tornado, Upper Air, Jet Stream and Storm chasing
		Next, if a jet stream moves over the top of a building storm and pulls the top of the building storm away from the main updraft, it kicks the storms into high gear causing some of the most violent storms and tornadoes.
		The jet streak moves along the jet stream at a slower speed than the wind in the maximum area.
		As jet stream air enters and leaves this area of high winds, the accelerations act to induced upper level divergence in the forward left quadrant (I), thus promoting convective activity.
	www.tornadochaser.net /jet.html (1089 words)

	NWS Norman, Oklahoma - Weather Glossary for Storm Spotters
		Spotters should be especially wary of inflow bands that are curved in a manner suggesting cyclonic rotation; this pattern may indicate the presence of a mesocyclone.
		Jet Stream - Relatively strong winds concentrated in a narrow stream in the atmosphere, normally referring to horizontal, high-altitude winds.
		A jet stream at low levels is known as a low-level jet.
	www.srh.noaa.gov /oun/severewx/glossary3.php (4037 words)

	Jet Stream and Horizontal Temperature Gradients (Site not responding. Last check: 2007-10-18)
		A jet stream is a narrow stream of relatively strong winds (i.e.
		The existence of a jet stream moving from west to east was suspected because of the movement of storms and cloud systems, but remained unproven until World War II, as the United State prepared for major air raids against Japan.
		The existence of the polar front jet streams is tied to the presence of horizontal temperature gradients.
	profhorn.aos.wisc.edu /wxwise/kinematics/jetcore2.html (494 words)

	USATODAY.com - Answers: Typical speeds of jet stream winds? (Site not responding. Last check: 2007-10-18)
		Usually, the fastest winds occur in what are known as jet streaks— pockets of even faster-moving air within the flow of the jet stream.
		Jet streaks are often the triggers in many outbreaks of tornadoes as well as an important ingredient in the making of intense snowstorms.
		A low-level jet stream is a common feature in the central USA during summer.
	www.usatoday.com /weather/resources/askjack/2003-11-28-answers-jet-streams_x.htm (604 words)

	Fast, high, cold wind (Site not responding. Last check: 2007-10-18)
		The jet stream, which blows between 8 to 12 kilometers above the surface, was discovered during World War II -- back when football players wore leather helmets and the United States wasn't the only country to measure with feet and inches.
		If the polar front jet stream is driven by differing temperatures and pressures at various altitudes, it also acts as a global mixing device, says Steve Ackerman of the Cooperative Institute for Meteorological Satellite Studies.
		The polar front jet stream is often accompanied by the winter storms and frigid temperatures.
	whyfiles.org /123snow/4.html (1355 words)

	AllRefer.com - jet stream (Atmospheric And Space Sciences: Atmosphere) - Encyclopedia
		The mean position of the stream in the Northern Hemisphere is between lat.
		Instead of moving along a straight line, the jet stream flows in a wavelike fashion; the waves propagate eastward (in the Northern Hemisphere) at speeds considerably slower than the wind speed itself.
		Since the progress of an airplane is aided or impeded depending on whether tail winds or head winds are encountered, in the Northern Hemisphere the jet stream is sought by eastbound aircraft, in order to gain speed and save fuel, and avoided by westbound aircraft.
	reference.allrefer.com /encyclopedia/J/jetstrea.html (320 words)

	THE 300 / 200 MB CHART
		Divergence and rising motion are strongest to the north of the jet axis, such as in Tennessee during highly curved jet streaks.
		A jet streak in a curved flow, such as the case when a jet streak is in the base of a trough, will have divergence and rising air to the north of the jet and convergence and sinking air to the south of the jet.
		If the jet stream winds are greater on the RIGHT side of a trough, the trough will become less amplified with time and move further north.
	www.theweatherprediction.com /charts/300 (1318 words)

	7(q) Upper Air Winds and the Jet Streams
		The jet stream core is surrounded by slower moving air that has an average velocity of 130 kilometers per hour in winter and 65 kilometers per hour in summer.
		Associated with the polar jet stream is the polar front.
		The shape and position of waves in the polar jet stream determine the location and the intensity of the mid-latitude cyclones.
	www.physicalgeography.net /fundamentals/7q.html (366 words)

	washingtonpost.com: Weather
		Relatively strong winds concentrated in a narrow stream in the atmosphere; normally referring to horizontal, high -altitude winds.
		General weather patterns (hot/cold, wet/dry) are related closely to the position, strength and orientation of the jet stream (or jet streams).
		The jet stream often "steers" surface features such as front and low pressure systems.
	www.washingtonpost.com /wp-srv/weather/longterm/glossary/data/jet_stream.htm (69 words)

	Breitling-Orbiter 3 - Tour du monde en ballon
		Generally moving from east to west, the jet stream is responsible for important gains in time on Europe-bound flights from the United States.
		Their work thus becomes even more essential: given that the jet stream is not a continuous tube around the globe, but is in fact fragmented, as shown on this map, meteorologists serve as "remote" guides.
		In the illustrated example, they must direct the balloon from jet stream 1 toward jet stream 2, by ordering the necessary changes of altitude in order to exploit the direction of winds at low and medium altitudes, while avoiding jet stream 3 which would lead nowhere.
	www.breitling.com /orbiter/breit98/eng/projet/concept/jet.html (591 words)

	Glossary of Terms: J
		The polar jet stream exists in the mid-latitudes at an altitude of approximately 10 kilometers.
		This jet stream flows from west to east at average speeds, depending on the time of year, between 110 to 185 kilometers per hour.
		The subtropical jet stream's winds are not as strong as the polar jet stream.
	www.physicalgeography.net /physgeoglos/j.html (239 words)

	Jet Stream (Site not responding. Last check: 2007-10-18)
		We know now that the jet stream is, to a large extent, responsible for much of the weather that occurs in the region of the country which is under its influence.
		The direction from which the jet stream flows dictates the type of weather.
		Since the jet stream is always moving, its location must be determined every day.
	www.koin.com /family/topstory.asp?RECORD_KEY[topstory]=ID&ID[topstory]=280 (537 words)

	Great Rivers of Air (Site not responding. Last check: 2007-10-18)
		Jet streams are narrow bands of high-speed winds that move like great rivers of air around Earth in each hemisphere.
		Generalized view of the polar jet stream flowing across North America.
		Notice that the fastest wind speeds tend to be in the middle of the jet stream.
	www.classzone.com /books/earth_science/terc/content/investigations/es1906/es1906page01.cfm?chapter_no=investigation (98 words)

	BBC NEWS \| UK \| Jet stream to blame for poor summer
		This ribbon of high altitude high speed wind is known as the polar jet stream, and is responsible for steering weather in our direction.
		To bring us the summer we are longing for, the jet stream needs to pass to the north of the UK.
		The polar jet stream naturally wavers around in the upper atmosphere and so it is not uncommon for it to be passing over our latitudes.
	news.bbc.co.uk /1/hi/uk/3897867.stm (484 words)

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