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Weather

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Flash flooding gripped the Chicago area Thursday morning, shutting down major thoroughfares at the height of morning rush hour and flooding dozens of underpasses.
http://cnn.com/2001/WEATHER/08/02/chicago.flooding/index.html

http://cnn.com/2001/WEATHER/08/02/chicago.flooding/index.html

Change is in the wind. The U.S. National Weather Service is about to revise how it measures the wind chill factor for the first time in 56 years.
http://cnn.com/2001/WEATHER/08/20/wind.chill/index.html

http://cnn.com/2001/WEATHER/08/20/wind.chill/index.html

At least three people are still missing Sunday after heavy rains flooded eastern Tennessee and Kentucky over the weekend, causing at least one death.
http://cnn.com/2001/WEATHER/08/05/Appalachian.floods/index.html

http://cnn.com/2001/WEATHER/08/05/Appalachian.floods/index.html

Tropical Storm Barry was drifting west across the Gulf of Mexico without gaining strength Friday night, forecasters said.
http://cnn.com/2001/WEATHER/08/03/ts.barry/index.html

http://cnn.com/2001/WEATHER/08/03/ts.barry/index.html

Tropical Storm Barry was slowly gaining strength early Sunday as the sluggish storm rumbled toward the Florida Gulf Coast.
http://cnn.com/2001/WEATHER/08/04/tropicalstorm.barry/index.html

http://cnn.com/2001/WEATHER/08/04/tropicalstorm.barry/index.html

Bands of rain from Tropical Storm Barry are whipping the Florida panhandle as the center of the storm moves closer by the hour.
http://cnn.com/2001/WEATHER/08/05/barry/index.html

http://cnn.com/2001/WEATHER/08/05/barry/index.html

CNN Meteorologist Chad Myers is monitoring skyrocketing temperatures across much of the United States on Wednesday. He offered tips on how to avoid heat stroke, while explaining why triple-digit temperatures play havoc with the body's cooling system.
http://cnn.com/2001/WEATHER/08/01/myers.heatindex.focus/index.html

http://cnn.com/2001/WEATHER/08/01/myers.heatindex.focus/index.html

Tropical Storm Chantal is building to hurricane strength as it marches toward the Windward Islands and the Caribbean Sea. CNN meteorologist Chad Myers takes a close look at what might be in store.
http://cnn.com/2001/WEATHER/08/16/myers.debrief.otsc/index.html

http://cnn.com/2001/WEATHER/08/16/myers.debrief.otsc/index.html

Chad Myers is a meteorologist and weather anchor for the CNN News Group based in CNN's world headquarters in Atlanta, providing weather reports for CNN/U.S. and CNN Headline News.
http://cnn.com/2001/WEATHER/08/03/myers.flooding.focus/index.html

http://cnn.com/2001/WEATHER/08/03/myers.flooding.focus/index.html

http://cnn.com/2001/WEATHER/08/06/Myers.otsc/index.html

http://cnn.com/2001/WEATHER/08/06/Myers.otsc/index.html

Chad Myers is a meteorologist and weather anchor for the CNN News Group based in CNN's world headquarters in Atlanta, Georgia. Myers has been following Tropical Storm Barry as it developed in the Gulf of Mexico and made landfall over the Florida Panhandle early Monday morning.
http://cnn.com/2001/WEATHER/08/06/Myers.focus/index.html

http://cnn.com/2001/WEATHER/08/06/Myers.focus/index.html

Belize and Mexico's Yucatan Peninsula braced Saturday for the arrival of Tropical Storm Chantal, which was passing to the south of Jamaica on its way into the western Caribbean.
http://cnn.com/2001/WEATHER/08/18/ts.chantal/index.html

http://cnn.com/2001/WEATHER/08/18/ts.chantal/index.html

Tropical Storm Chantal strengthened almost to hurricane strength Monday as it approached the coast of Belize and Mexico.
http://cnn.com/2001/WEATHER/08/20/ts.chantal/index.html

http://cnn.com/2001/WEATHER/08/20/ts.chantal/index.html

Tropical Storm Chantal maintained its near-hurricane level strength on Sunday, despite being disorganized and struggling, according to the U.S. National Weather Service.
http://cnn.com/2001/WEATHER/08/19/tropical.storm.chantal/index.html

http://cnn.com/2001/WEATHER/08/19/tropical.storm.chantal/index.html

Chantal, the Atlantic's third tropical storm of the season, was weakening Thursday night into a strong tropical wave off the Windward Islands in the Caribbean.
http://cnn.com/2001/WEATHER/08/16/chantal/index.html

http://cnn.com/2001/WEATHER/08/16/chantal/index.html

Tropical Storm Chantal, downgraded to a tropical depression, was moving slowly Tuesday across the Yucatan Peninsula, bringing as much as 10 inches of rain with it.
http://cnn.com/2001/WEATHER/08/21/chantal/index.html

http://cnn.com/2001/WEATHER/08/21/chantal/index.html

The first taste of relief from sizzling hot temperatures reached the northern Plains states Thursday, thanks to a cold front that brought showers and cooler weather.
http://cnn.com/2001/WEATHER/08/09/heatwave/index.html

http://cnn.com/2001/WEATHER/08/09/heatwave/index.html

Clouds and rain draped across the East coast early Monday while a low pressure system sliced over the Great Lakes. High pressure built over the Southwest.
http://cnn.com/2001/WEATHER/08/27/weatherpage.am/index.html

http://cnn.com/2001/WEATHER/08/27/weatherpage.am/index.html

The European Union has offered Poland funds to help repair flood damage that devastated large tracts of the country.
http://cnn.com/2001/WEATHER/08/03/poland.floodaid/index.html

http://cnn.com/2001/WEATHER/08/03/poland.floodaid/index.html

Tornado and flash flood watches remained in effect in much of Florida and Alabama on Monday after the remains of Tropical Storm Barry moved into Mississippi.
http://cnn.com/2001/WEATHER/08/06/tsbarry/index.html

http://cnn.com/2001/WEATHER/08/06/tsbarry/index.html

Hurricane experts released modified forecasts Friday for the 2001 Atlantic Hurricane Season, warning of a stronger season than initially predicted.
http://cnn.com/2001/WEATHER/08/10/hurricane.season/index.html

http://cnn.com/2001/WEATHER/08/10/hurricane.season/index.html

Forecasters are warning that Tropical Storm Chantal could become a hurricane Saturday.
http://cnn.com/2001/WEATHER/08/17/chantal/index.html

http://cnn.com/2001/WEATHER/08/17/chantal/index.html

A cold front moving over the lower Mississippi Valley on Saturday was expected to produce showers and thunderstorms from southern Missouri to Mississippi, and scattered afternoon showers were forecast across the South.
http://cnn.com/2001/WEATHER/08/18/weatherpage.am/index.html

http://cnn.com/2001/WEATHER/08/18/weatherpage.am/index.html

John Zarrella, CNN's Miami bureau chief, has watched storms come and go in the Caribbean since heading to Miami from Atlanta in 1983. His coverage included the devastating Hurricane Andrew in 1992. He talked with CNN.com about the current hurricane season, and what may be to come.
http://cnn.com/2001/WEATHER/08/07/Zarrella.otsc/index.html

http://cnn.com/2001/WEATHER/08/07/Zarrella.otsc/index.html

As the Atlantic hurricane season's second named storm faded into memory on its way over Mississippi and Arkansas, hurricane forecaster William Gray predicted two more named storms in the Atlantic Ocean and Gulf of Mexico during the month of August.
http://cnn.com/2001/WEATHER/08/07/hurricane.prediction/index.html

http://cnn.com/2001/WEATHER/08/07/hurricane.prediction/index.html

The sweltering Midwest hoped for a break from temperatures approaching triple digits Wednesday -- a heat wave in which two athletes have died, including an NFL player.
http://cnn.com/2001/WEATHER/08/01/heatwave/index.html

http://cnn.com/2001/WEATHER/08/01/heatwave/index.html

Chad Myers is a meteorologist and weather anchor for the CNN News Group based in CNN's world headquarters in Atlanta, providing weather reports for CNN/U.S. and CNN Headline News.
http://cnn.com/2001/WEATHER/08/03/Myers/index.html

http://cnn.com/2001/WEATHER/08/03/Myers/index.html

One person was killed and at least 10 others were missing after heavy rains in eastern Kentucky swelled creeks over their banks.
http://cnn.com/2001/WEATHER/08/04/kentucky.floods/index.html

http://cnn.com/2001/WEATHER/08/04/kentucky.floods/index.html

Showers stalked the Great Lakes, Gulf Coast and Mississippi Valley early Wednesday, while humidity evaporated across the East and high pressure built over the far West.
http://cnn.com/2001/WEATHER/08/15/weatherpage.am/index.html

http://cnn.com/2001/WEATHER/08/15/weatherpage.am/index.html

Remnants of Tropical Storm Barry continued dumping heavy rains on Alabama on Tuesday, but the storm that knocked down tree limbs and power lines when it whipped across the Gulf Coast had mostly dissipated.
http://cnn.com/2001/WEATHER/08/07/barry.remnants/index.html

http://cnn.com/2001/WEATHER/08/07/barry.remnants/index.html

Showers and severe thunderstorms will linger near Virginia and North Carolina Tuesday as a cold front moving off the East Coast pushes off into the Atlantic. Meanwhile, high pressure building behind the front will bring clear to partly cloudy skies to areas in the Great Lakes.
http://cnn.com/2001/WEATHER/08/28/weatherpage.am/index.html

http://cnn.com/2001/WEATHER/08/28/weatherpage.am/index.html

Almost as quickly as it arrived, Tropical Storm Dean was gone, reduced on Thursday to a tropical wave without an organized center.
http://cnn.com/2001/WEATHER/08/23/dean/index.html

http://cnn.com/2001/WEATHER/08/23/dean/index.html

The dog days of summer brought blistering heat to half the country Wednesday, with dangerous humidity levels forecast for areas already seeking recovery from extremely hot weather.
http://cnn.com/2001/WEATHER/08/08/heat.wave/index.html

http://cnn.com/2001/WEATHER/08/08/heat.wave/index.html

Rising water and heavy rain soaked southeastern Florida on Thursday and Friday, flooding scores of homes and prompting one county to declare a state of emergency.
http://cnn.com/2001/WEATHER/08/03/florida.flooding/index.html

http://cnn.com/2001/WEATHER/08/03/florida.flooding/index.html

A storm which battered Russia's Baltic Coast blacked out a naval base in the isolated enclave of Kaliningrad and cut power two seaside resort towns.
http://cnn.com/2001/WEATHER/08/28/russia.storm/index.html

http://cnn.com/2001/WEATHER/08/28/russia.storm/index.html

High pressure built along the East coast early Wednesday, while rain lashed Florida, the Pacific Northwest coast, Rockies and Plains. More punishing heat smothered the South.
http://cnn.com/2001/WEATHER/08/01/weatherpage.am/index.html

http://cnn.com/2001/WEATHER/08/01/weatherpage.am/index.html

A storm system that rolled into the Northeast and snapped the heat wave that punished the region this week was predicted to move into the South and have similar consequences.
http://cnn.com/2001/WEATHER/08/11/weatherpage.am/index.html

http://cnn.com/2001/WEATHER/08/11/weatherpage.am/index.html

Late summer thunderstorms inundated the Chicago area with heavy rain, leaving motorists stranded in ponds of water and collapsing a building.
http://cnn.com/2001/WEATHER/08/31/chicago.flooding/index.html

http://cnn.com/2001/WEATHER/08/31/chicago.flooding/index.html

Residents and authorities were cleaning up Saturday from a series of tornadoes that swept through the Midwest Friday evening, flattening homes, downing trees and forcing the evacuation of several neighborhoods.
http://cnn.com/2001/WEATHER/08/18/midwest.tornadoes/index.html

http://cnn.com/2001/WEATHER/08/18/midwest.tornadoes/index.html

A series of tornadoes swept throughout the Midwest Friday evening, flattening homes, downing trees and forcing the evacuation of a small town in Nebraska.
http://cnn.com/2001/WEATHER/08/17/nebraska.tornadoes/index.html

http://cnn.com/2001/WEATHER/08/17/nebraska.tornadoes/index.html

As the storm that was once Chantal scattered over Mexico, a new storm, already classified a tropical storm, loomed over the eastern Caribbean north of the Virgin Islands.
http://cnn.com/2001/WEATHER/08/22/chantal/index.html

http://cnn.com/2001/WEATHER/08/22/chantal/index.html

The Virgin Islands and Puerto Rico faced a night of continued squalls and possibly isolated tornadoes Wednesday as Tropical Storm Dean moved west-northwest through the eastern Caribbean delivering heavy rains and strong wind gusts.
http://cnn.com/2001/WEATHER/08/22/dean/index.html

http://cnn.com/2001/WEATHER/08/22/dean/index.html

A tropical wave in the eastern Gulf of Mexico has strengthened into the season's second tropical storm, an Air Force Reserve reconnaissance aircraft reported Thursday.
http://cnn.com/2001/WEATHER/08/02/tropical.storm.barry/index.html

http://cnn.com/2001/WEATHER/08/02/tropical.storm.barry/index.html

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Wikipedia-Article "Weather"

Composite satellite image showing the progress of a hurricane weather system approaching the East Coast of the United States
Enlarge
Composite satellite image showing the progress of a hurricane weather system approaching the East Coast of the United States

Weather comprises all the various phenomena that occur in the atmosphere of a planet. "Weather" is normally taken to mean the activity of these phenomena over short periods of time, usually no more than a few days in length. Average weather conditions over significantly longer periods is known as climate, which is studied by climatologists for signs of climate change.

Contents

Terrestrial weather

Main article: Meteorology

On Earth, the regular events include wind, thunderstorms, rain, sleet, hail, snow, and fog which occur in the troposphere or the lower part of the atmosphere. Weather is driven by differences in energy received from the sun. Due to the different angles that sunlight intersects the earth, different parts of it are heated to different extents. This causes temperature differences, which lead to global wind, as well as, indirectly, all other weather phenomena. Direct causes of weather are temperature, humidity, atmospheric pressure, cloud cover, wind speed, and elevation.

The Earth's atmosphere is one large inter-related system so small changes to one part can have large effects in other parts, i.e., it is a chaotic system. This makes it very difficult to accurately predict short term weather changes more than a few days in advance, though weather forecasters large and small are continually working to improve this limit through the science of the study of weather: meteorology.

Extra-terrestrial weather

Jupiter's Great Red Spot
Enlarge
Jupiter's Great Red Spot

Weather phenomena and systems on other planets are thought to be similar to those on Earth, but often occur on a much bigger scale. Extra-terrestrial weather systems can be extremely stable; one of the most famous landmarks in the solar system, Jupiter's Great Red Spot is an anticyclonic storm known to have existed for at least 300 years. On other gas giants, the lack of a surface allows the wind to reach enormous speeds: gusts of up to 400 metres per second have been measured on the planet Neptune. This has created a puzzle for planetary scientists: The weather is created by the differential action of the Sun's energy on different places and the amount of energy received by Neptune is very, very small, relative to the Earth, yet the strength and magnitude of weather phenomena on Neptune is far, far greater than on Earth. This mystery is still to be solved.

Earth's weather appears to behave based on about a half-dozen latitudinal weather zones. Jupiter's banded appearance shows over a dozen such zones, while Venus appears to have no zones at all. Studying how the weather works on other planets has been seen as helpful in understanding how it works on Earth.

Extra-planetary weather

Weather is not limited to just planetary bodies however. A star's corona is constantly being lost to space, creating what is essentially a very thin atmosphere throughout the solar system, known as the solar wind. Inconsistencies in this wind and larger events on the surface of the star, such as Coronal Mass Ejections, form a system that has features analogous to conventional weather systems (i.e. pressure and wind), and though not true weather, is known as space weather. The activity of this system can affect planetary atmospheres and occasionally surfaces. The interaction of the solar wind with the terrestrial atmosphere can produce spectacular aurorae, but can play havoc with electrically sensitive systems such as electricity grids and radio signals.

See also

Look up Weather in Wiktionary, the free dictionary
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