61. CNN - El Niño May Weaken Spring Tornadoes - March 16, 1998 CNN http://www.cnn.com/WEATHER/9803/16/tornado/index.html

COMMUNITY Message Boards Chat Feedback SITE SOURCES Contents Help! Search CNN Networks SPECIALS Quick News Almanac Video Vault News Quiz S P E C I A L By Environmental News Network staff William Monfredo, who has been busy studying 40 years of accumulated weather data, is predicting a decrease in the frequency of strong and violent 1998 season tornadoes those rated 2-5 on the Fujita scale for the central United States. The national tornado season is February-July and usually peaks in the spring. Monfredo obtained much of his data from weather balloon recordings. After analyzing the information with a statistical model, he determined that wind speed and direction were inconsequential factors. "Cap strength" is another matter, however. "The stronger the cap, the longer it takes for building clouds to break through into the upper atmosphere," he explained. "The resulting storms and tornadoes traditionally are more violent than usual." Related ENN Stories: Twister's tornado sensor may become reality Tornado chasers return to the field Related sites: National Weather Service ENN El Nino Special Report Strange Brew Fire and Rain ... Sound off on our A Time Warner Company Terms under which this service is provided to you.

62. CNN.com - Tornadoes Strike Iowa, Kansas - May 12, 2000 CNN http://www.cnn.com/2000/WEATHER/05/12/midwest.storms.02/index.html

weather CNN Sites CNN CNNfn CNNSI myCNN AllPolitics Languages myCNN Video Audio Headline News Brief ... Feedback CNN Sites CNN CNN Europe CNNfn CNNSI myCNN CNNfyi AllPolitics Languages Search CNN.com CNNSI.com CNNfn.com The Web WEATHER TOP STORIES MORE TOP STORIES More than 11,000 killed in India quake Israelis, Palestinians make final push before Israeli election Davos protesters face tear gas MORE ... MORE MARKETS 4:30pm ET, 4/16 DJIA NAS SPORTS Jordan says farewell for the third time ... LOCAL EDITIONS: CNN.com Europe change default edition MULTIMEDIA: video video archive audio multimedia showcase ... more services E-MAIL: Subscribe to one of our news e-mail lists Enter your address: DISCUSSION: chat feedback CNN WEB SITES: CNNfyi.com CNN.com Europe AsiaNow Spanish ... Korean Headlines TIME INC. SITES: Go To ... Time.com People Money Fortune EW CNN NETWORKS: CNN anchors transcripts Turner distribution SITE INFO: help contents search ad info ... jobs WEB SERVICES: Tornadoes strike Iowa, Kansas One woman critically hurt At least a dozen tornadoes were reported northeast of Waterloo, Iowa, on Thursday May 12, 2000

63. What Are Tornadoes? By Jim Cornish This page explains how tornadoes form. tornadoes, or twisters as they are sometimes called, are nature s fiercest storms. tornadoes are funnelshaped, http://www.cdli.ca/CITE/tornadoes_what.htm

Elementary Themes What Are Tornadoes? Tornadoes Formation Appearance Size ... Tornadoes Theme Page What Are Tornadoes? Tornadoes, or twisters as they are sometimes called, are nature's fiercest storms. Tornadoes are funnel-shaped wedged-shaped and rope-shaped and seem to appear from the bottoms of the huge thunderstorm clouds. Despite their small size when compared to other wind storms like hurricanes , tornadoes produce very strong winds. If they pass over populated areas they can cause huge amounts of damage to property and many death to animals and humans. Top of Page How Do Tornadoes Form? Exactly how tornadoes form is still not completely known. But after many years of study, meteorologists , scientists who study weather, do know some things for sure. Tornadoes can form as part of several different types of storms but they are produced inside powerful thunderstorms more than any other. Tornadoes form where warm, moist air and cold, dry air meet and begin to create updrafts that develop into massive rotating cumulonimbus clouds or supercells . Sometimes a spinning column of air called a vortex forms within these clouds. When this vortex becomes visible as a funnel cloud and reaches the ground, a tornado is created.

64. Tornadoes And Tornado Research A comprehensive website on tornadoes with information on how tornadoes form, and what to do when a tornado strikes. Also featured pictures of tornadic damage, information on current tornado research, and an extensive list of links. http://www.geocities.com/joefurr2/

Tornado Formation Tornado Safety Tornado Statistics The Fujita Scale ... View Guestbook document.write(""); This site last updated 07-15-05. Joe Furr

65. Scholastic.com | Online Activities: Weather Watch Severe Weather and Natural Disaster. tornadoes it may cause the updraft to begin rotating, and a tornado is born. Learn more about tornadoes indepth. http://teacher.scholastic.com/activities/wwatch/tornadoes/

Scholastic Home About Us Site Map Search ... Tornadoes Tornadoes The Basics In-Depth Experiments Witness Account ... See a Tornado The Basics The tornado funnel forms, kicking up dust and debris from the ground. (Photo: NOAA) What is it? A tornado is a violently rotating column of air that descends from a thunderstorm. No other weather phenomenon can match the fury and destructive power of tornadoes. They can destroy large buildings, lift 20-ton railroad cars from their tracks, and drive straw and blades of grass into trees and telephone poles. Tornado winds can reach 300 miles per hour. How do they work? In order to form a tornado, you need three very different types of air to come together in a particular way: Near the ground, there's a layer of warm, humid air and strong south winds. In the upper atmosphere, you'll find colder air and strong west or southwest winds. The air near the surface is much less dense than the cold, dry air aloft. This condition is called instability.

66. Tornado - Storm Chaser And Weather Information Photos, history, and video clips of Kansas tornadoes, along with current weather. http://www.cyberlodg.com/mattdennis/ktc/

Tornado Reports Full Hurricane Rita Report winds topped 200+ mph, lowest pressure 898 mb. Welcome UK Listeners of LBC 97.3 radio who heard him on the Alison Bell show and the readers of BBC Top Gear magazine who read the article about Tornado Tim in the September issue. Storm Chaser School Storm Chaser Info Storm Spotter Glossary Debt Management For You ... www.satellitesolutions.com/dishnetwork/ why you should select direct tv over dish network Stock Video -Stock Video - News Video available All Showcase Web Directory - offers family friendly links for business, finance, health, diseases, shopping, travel, computer, and internet services. accept free url submission. Tornado Warnings sent to your wireless device. Be Prepared. Click above for more info. Website hosted by Cyberlodge Obsessed with tornadoes? Get our Free Tornado Chaser Email Weather Disaster Checklist What everyone should do to prepare for a possible tornado strike on your home and family. Prepare now to minimize the di sasters effects on you.

67. Weather: Tornadoes Some tornadoes, which are called landspouts over land and The stronger tornadoes are believed to come from thunderstorms that are rotating (or http://teacher.scholastic.com/researchtools/articlearchives/weather/tornado.htm

Scholastic Home About Us Site Map Search ... Tools Weather The following questions were answered by meteorologists Barbara McNaught Watson and Al Peterlin. Tornadoes Q: How are tornadoes formed? A: Tornadoes are generally formed in a thunderstorm. Thundershowers this violent require a complex mix of environmental conditions but usually include: a) very warm, humid air, b) very cool, dry air to the west and south, c) air to the west trying to replace the warm, moist air (a front moving in), c) upper level (high in the sky) conditions that first hold down warmer air from rising and then later, a complete reverse in conditions that let the warm air rise very fast and very far, and d) an upper level wind stream to move the air away from the rising column. This sounds complicated, but it really boils down to warm, wet air driven east by a strong cold front and what we call instability. (Al Peterlin) Q: What does the funnel of a tornado look like? A: A tornado is a rotating column of air that reaches from a thunderstorm cloud to the ground. If it doesn't reach the ground, it's called a funnel cloud because it's shaped like a funnel. The color is dark because of dust and dirt pulled up into it from the ground. (Al Peterlin) Q: How do tornadoes end?

68. What_causes_tornadoes? A description of the special conditions that can cause a thunderstorm to become tornadic. http://www.weatherquestions.com/What_causes_tornadoes.htm

Provided by For weather, enter ZIP code or City, State New! 2005 Hurricane Season What causes tornadoes? Tornadoes form in unusually violent thunderstorms when there is sufficient (1) instability, and (2) wind shear present in the lower atmosphere. Instability refers to warmer and more humid than usual conditions in the lower atmosphere, and possibly cooler than usual conditions in the upper atmosphere. Wind shear in this case refers to the wind direction changing, and the wind speed increasing, with height. An example would be a southerly wind of 15 mph at the surface, changing to a southwesterly or westerly wind of 50 mph at 5,000 feet altitude. This kind of wind shear and instability is usually exists only ahead of a cold front and low pressure system . The intense spinning of a tornado is partly the result of the updrafts and downdrafts in the thunderstorm (caused by the unstable air) interacting with the wind shear, causing a tilting of the wind shear to form and upright tornado vortex. Helping the process along, cyclonically flowing air around the cyclone, already slowly spinning in a counter-clockwise direction (in the Northern Hemisphere), converges inward toward the thunderstorm, causing it to spin faster. This is the same process that causes an ice skater to spin faster when she pulls her arms in toward her body. Other processes can enhance the chances for tornado formation. For instance, dry air in the middle atmosphere can be rapidly cooled by rain in the thunderstorm, strengthening the downdrafts that are needed for tornado formation. Notice that, in virtually every picture you see of a tornado, the tornado has formed on the boundary between dark clouds (the storm updraft region) and bright clouds (the downdraft region), evidence for the importance of updrafts and downdrafts to tornado formation. Also, an isolated strong thunderstorm just ahead of a squall line that then merges with the squall line often becomes tornadic; isolated storms or more likely to form tornadoes than squall lines, since an isolated storm can form a more symmetric flow pattern around it and also have less competition for unstable air "fuel" than if it were part of a solid line of storms.

69. CDC Tornadoes Information on terrorism and public health. Provided by the Centers for Disease Control and Prevention (CDC). http://www.bt.cdc.gov/disasters/tornadoes/

@import url(/css/newbrowsers.css); @import url(/css/newbrowsers-lmr.css); Welcome to the CDC Emergency Preparedness and Response site. Skip directly to the search box site navigation , or content Note: If you can read this text, you are probably using a browser that is not compliant with current Internet standards. You may want to upgrade your browser CDC Home About CDC Press Room ... Contact Us Search: Home Bioterrorism Agents Chemical Emergencies Mass Casualties ... Natural Disasters Tornadoes Knowing what to do when you see a tornado, or when you hear a tornado warning, can help protect you and your family. During a tornado, people face hazards from extremely high winds and risk being struck by flying and falling objects. After a tornado, the wreckage left behind poses additional injury risks. Although nothing can be done to prevent tornadoes, there are actions you can take for your health and safety. Preparing for a Tornado What to do During a Tornado Signs of approaching tornados, taking shelter About Tornadoes What is a tornado, how are they formedÂ

70. CNN - At Least 8 Dead As Tornadoes Rake Tennessee - January 18, 1999 CNN http://www.cnn.com/WEATHER/9901/18/tornado.02/index.html

MAIN PAGE WORLD ASIANOW U.S. ... news quiz CNN WEB SITES: TIME INC. SITES: Go To ... Time.com People Money Fortune EW MORE SERVICES: video on demand video archive audio on demand news email services ... pagenet DISCUSSION: message boards chat feedback SITE GUIDES: help contents search FASTER ACCESS: europe japan WEB SERVICES: At least 8 dead as tornadoes rake Tennessee January 18, 1999 Web posted at: 4:11 a.m. EST (0911 GMT) JACKSON, Tennessee (CNN) Tornadoes accompanied by damaging winds, rain and hail slammed parts of central and western Tennessee on Sunday night, killing at least eight people and injuring dozens of others. Madison County was the hardest hit area with seven people confirmed dead and at least another 10 who are missing, said Kurt Pickering of the Tennessee Emergency Management Agency. INTERACTIVE: Image gallery of storm damage A woman was found dead in the ruins of her home in Henderson County and another person was killed in Hardeman County. At least 35 people have been treated for minor injuries at the Jackson-Madison County General Hospital, and 11 are in critical condition, according to Jack Rudnick Jr., the Vice President of West Tennessee Healthcare. Most of the minor injuries consisted of scratches, cuts and bruises, said Rudnick. Power outages were reported in many areas as high winds damaged homes and snapped tree limbs and power lines.

71. The Online Tornado FAQ (by Roger Edwards, SPC) Roger Edwards of the Storm Prediction Center presents basic Frequently Asked Questions and the answers about tornadoes. http://www.spc.noaa.gov/faq/tornado/

About this FAQ The Basics about Tornadoes Tornado Forecasting Tornado Damage ... ABOUT THIS FAQ FAQ last updated 5-5-5 This list of Frequently Asked Questions (FAQ) has been compiled from questions asked of the author and his colleagues, as well as basic tornado research information and countless scientific resources. More material will be added, time permitting. The Tornado FAQ is not intended to be a comprehensive guide to tornadoes. Instead, it is a quick-reference summary of tornado knowledge, which will link you to more detailed information if you desire. Recent books from your local library or a major university library are still the deepest resource for learning about tornadoes and other severe storms; so if you are doing your own research or school reports, please visit the library in person. There are many good websites with tornado information also. Some of them are linked from the answers below. None of the links to outside websites implies any kind of commercial endorsement on the part of the author or SPC. The intent here is to direct you to the best tornado info available, regardless of whether the source is private, public or commercial. There is also a partial list of technical scientific references related to tornadoes for those with some meteorological education and training.

72. Greg's Weather Center--Under Renovation Large collection of links to sites about weather (hurricanes, blizzards, and tornadoes) and a section with storm updates. http://members.aol.com/hurctrack/HurcTrack.index.html

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73. Inside Tornadoes Multimedia @ National Geographic Magazine Feature. Inside tornadoes. JUNE 2005. Feature Main Page Photo Gallery On Assignment Learn More. Multimedia Inside a Tornado. Multimedia Storm Chaser http://www.nationalgeographic.com/ngm/0506/feature6/multimedia.html

SPECIALS Enter King Tut's Tomb Inside a Tornado Inside Tornadoes JUNE 2005 Feature Main Page Photo Gallery On Assignment Learn More Multimedia: Inside a Tornado Multimedia: Storm Chaser Postcard View up-close footage of an F4 tornado. Listen to Tim Samaras talk about the thrill of the chase and catching a tornado. ... Click here to view the greatest collection of National Geographic photos ever compiled. Renew Access Account Change Address Give a Gift Click Here Sorry, your browser does not support iframes. This form is available here: subscription form

74. CNN.com - Tornadoes Kill At Least 11 In Georgia - February 14, 2000 CNN http://www.cnn.com/2000/WEATHER/02/14/storms.03/index.html

weather CNN Sites CNN CNNfn CNNSI myCNN AllPolitics Languages myCNN Video Audio Headline News Brief ... Feedback CNN Sites CNN CNN Europe CNNfn CNNSI myCNN CNNfyi AllPolitics Languages Search CNN.com CNNSI.com CNNfn.com The Web WEATHER TOP STORIES MORE TOP STORIES More than 11,000 killed in India quake Israelis, Palestinians make final push before Israeli election Davos protesters face tear gas MORE ... MORE MARKETS 4:30pm ET, 4/16 DJIA NAS SPORTS Jordan says farewell for the third time ... daily almanac MULTIMEDIA: video video archive audio multimedia showcase ... more services DISCUSSION: message boards chat feedback CNN WEB SITES: AsiaNow Spanish Portuguese Italian ... Danish FASTER ACCESS: europe japan TIME INC. SITES: Go To ... Time.com People Money Fortune EW CNN NETWORKS: more networks transcripts Turner distribution SITE INFO: help contents search ad info ... jobs WEB SERVICES: Tornadoes kill at least 11 in Georgia Debris marks the path of the storm through Lonoke, Arkansas 'It looks like a nuclear bomb went off' February 14, 2000 Web posted at: 10:12 a.m. EST (1512 GMT) In this story: State of emergency in 4 counties 'It was awful' Possible twisters elsewhere RELATED STORIES, SITES

75. National Geographic: Eye In The Sky--Tornadoes National Geographic shows video clips, destruction and detection information, and photography of tornadoes and waterspouts in the United States. http://www.nationalgeographic.com/eye/tornadoes/tornintro.html

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76. Tornadoes Touch Down In Missouri, 2 Dead CNN http://cnn.com/2002/WEATHER/12/18/missouri.storm.ap/index.html

77. Tornado - Wikipedia, The Free Encyclopedia tornadoes do occur throughout the world as well; the most tornadoprone The biggest tornado outbreak on record—with 148 tornadoes, including six F5 and http://en.wikipedia.org/wiki/Tornado

Tornado From Wikipedia, the free encyclopedia. For other uses of Tornado, see Tornado (disambiguation) A tornado over land. A tornado is a violent windstorm characterized by a twisting, funnel-shaped cloud . The word "tornado" comes from the Spanish verb tornar , meaning "to turn." Tornadoes form in storms all around the world, and though they have been recorded in all 50 U.S states, they form most famously in a broad area of the American Midwest and South known as Tornado Alley . Although, in pure number of incidences, the United States experiences more tornadoes than any other country, the United Kingdom is the most tornado-prone country relative to land area. Some common, related slang terms are: twister whirlwind wedge funnel gustnado landspout willy-willy , or rope Cyclone is also another term for a tornado, although it must be noted that in parts of the world (notably Australia ) a Cyclone refers to what is more correctly known as a Tropical Cyclone (or sometimes a Hurricane ), and for this reason, the use of the term Cyclone on its own should be avoided when describing a Tornado to avoid confusion (see the entry on Cyclones for more information).

78. CNN - Tornadoes Kill 4 In Tennessee, Arkansas - April 16, 1998 CNN http://www.cnn.com/WEATHER/9804/16/tornado/index.html

COMMUNITY Message Boards Chat Feedback SITE SOURCES Contents Help! Search CNN Networks SPECIALS Quick News Almanac Video Vault News Quiz Tornadoes kill 4 in Tennessee, Arkansas Manila, Arkansas April 16, 1998 Web posted at: 7:36 p.m. EDT (2336 GMT) MANILA, Arkansas (CNN) At least one more tornado was sighted Thursday in an area of Arkansas already hit hard by a twister early in the day. But sirens designed to warn residents were inoperable because power lines were knocked down by the earlier storms. A tornado, shrouded by darkness, skipped across northeastern Arkansas and western Tennessee early Thursday, killing four people, including a brother and sister who died in their mobile home. At least 22 people were injured. Damage from the tornado 2.6MB/24 sec./320x240 824K/24 sec./160x120 QuickTime movie Rick Walker of KTBM Radio, reporting from Jonesboro, Arkansas, later said warning sirens in northeastern Arkansas, where the National Weather Service issued new tornado warnings, were not functioning. "Everyone is very much on edge," Walker said.

79. Tornadoes - Environment Canada This page provides information and safety precautions for tornadoes. http://www.pnr-rpn.ec.gc.ca/air/summersevere/ae00s02.en.html

Français Contact Us Help Search ... Weatheradio Extreme Events Alberta Saskatchewan Manitoba J u s t F o r K i d s Summer Tips Weather Words Tornadoes The typical tornado first appears as a rotation in a huge thunder cloud, behind a shroud of heavy rain or hail. The sky usually turns green, yellow or black. The tornado descends as a violently rotating funnel cloud and sounds like the rumble of a freight train or a jet and can be quite deafening. Tornadoes typically snake erratically from southwest to northeast, toppling buildings, scattering debris and tossing cars as though they were toys. A tornado can last just a few minutes or a few hours and usually leaves a wake of destruction. In Canada, during an average year, approximately 80 tornadoes occur and, on average, cause two deaths and 20 injuries, plus tens of millions of dollars in property damage. These are the reported numbers, many more tornadoes strike unpopulated areas and go undetected. The averages are also deceiving because the majority of twisters do little more than bend TV antennae, break windows, uproot trees, or damage weak structures such as barns and sheds. With wind speeds of less than 160 km/h, and a path 100 m wide by 2 km long, these small tornadoes cause less than three percent of all deaths.

80. CNN.com - Downtown Fort Worth Sealed Off After Tornadoes' Rampage - March 29, 20 CNN http://www.cnn.com/2000/WEATHER/03/29/ft.worth.tornado.02/index.html

weather CNN Sites CNN CNNfn CNNSI myCNN AllPolitics Languages myCNN Video Audio Headline News Brief ... Feedback CNN Sites CNN CNN Europe CNNfn CNNSI myCNN CNNfyi AllPolitics Languages Search CNN.com CNNSI.com CNNfn.com The Web WEATHER TOP STORIES MORE TOP STORIES More than 11,000 killed in India quake Israelis, Palestinians make final push before Israeli election Davos protesters face tear gas MORE ... MORE MARKETS 4:30pm ET, 4/16 DJIA NAS SPORTS Jordan says farewell for the third time ... daily almanac MULTIMEDIA: video video archive audio multimedia showcase ... more services E-MAIL: Subscribe to one of our news e-mail lists Enter your address: DISCUSSION: message boards chat feedback CNN WEB SITES: AsiaNow Spanish Portuguese Italian ... Danish FASTER ACCESS: europe japan TIME INC. SITES: Go To ... Time.com People Money Fortune EW CNN NETWORKS: more networks transcripts Turner distribution SITE INFO: help contents search ad info ... jobs WEB SERVICES: Downtown Fort Worth sealed off after tornadoes' rampage Submerged cars hit an urban lake in Fort Worth March 29, 2000 Web posted at: 9:23 a.m. EST (1423 GMT) In this story: Deadly wind and flooding Like a bomb going off Arlington, Grand Prairie also hard-hit

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