41. BBC - Weather Centre - WeatherWise - Fact Files - Tornadoes One of the most terrifying weather events is a fully developed tornado. The strong air currents within a storm cloud can create a high speed vortex (spiral) http://www.bbc.co.uk/weather/weatherwise/factfiles/extremes/tornadoes.shtml

@import '/includes/tbenh.css'; Home TV Radio Talk ... A-Z Index 4 April 2008 Accessibility help Text only BBC Homepage Weather Home ... Contact Us Like this page? Send it to a friend! WeatherWise - Fact Files - Tornadoes - A Path of Destruction Severe Thunderstorms View this Illustration One of the most terrifying weather events is a fully developed tornado. The strong air currents within a storm cloud can create a high speed vortex (spiral) or funnel of winds. Wherever the end of the vortex touches the ground it creates a path of concentrated destruction that has no equal in nature. Near the core of a tornado, winds may spiral around at more than 480 km/h (300 mph). How are tornadoes created? Tornadoes develop near the boundary between the upcurrents and downdraughts in a storm cloud . A 'funnel cloud' develops first from the cloud base and this may then extend down to ground level. 'Waterspouts' are simply tornadoes that form over water rather than land. They tend to lose their energy as soon as they cross from water to land. Waterspouts are usually confined to shallow waters during warmer seasons.The destruction caused by tornadoes is due mainly to the violence of the winds. There is very low pressure at the centre of the vortex. If a tornado goes over a building it can explode outwards because of the sudden drop in pressure as the vortex passes over the building. Although they are usually less than 250 m across, they can travel a long way, sometimes more than 200 km (125 miles) across the land surface. They pick up material from the ground as they go, including cows, cats, dogs and other animals - including humans! They can be the source of some very

42. NCDC: Tornadoes > Climatology Because a tornado is part of a severe thunderstorm, and thunderstorms occur all over the Earth, tornadoes are not limited to any specific geographic http://www.ncdc.noaa.gov/oa/climate/severeweather/tornadoes.html

DOC NOAA NESDIS NCDC Search Field: NCDC Climate Monitoring Tornado Safety Help U.S. Tornado Climatology National Climatic Data Center Asheville, North Carolina Updated 27 February 2008 Overview Tornado Alley Timing Historical Records and Trends ... Links to Additional Information Overview Because a tornado is part of a severe thunderstorm, and thunderstorms occur all over the Earth, tornadoes are not limited to any specific geographic location. In fact, tornadoes have been documented in every one of the United States, and on every continent, with the exception of Antarctica (even there, a tornado occurrence is not impossible). In fact, wherever the atmospheric conditions are right, the occurrence of a tornadic thunderstorm is possible. More on the conditions necessary for tornado formation can be found at the NOAA National Severe Storms Laboratory Tornado Page In terms of absolute tornado counts, the United States leads the list, with an average of over 1,000 tornadoes recorded each year. A distant second is Canada, with around 100 per year. Other locations that experience frequent tornado occurrences include northern Europe, western Asia, Bangladesh, Japan, Australia and New Zealand. In fact, the United Kingdom has more tornadoes, relative to its land area, than any other country. Fortunately, most UK tornadoes are relatively weak. [ Encyclopaedia Britannica Article Regions of the world with increased likelihood of experiencing tornadoes.

43. Introduction To Tornadoes A tornado (from the Spanish tronada , meaning thunderstorm) is a violently rotating column of air rising up into a cloud. A thunderstorm is the first step http://movies.warnerbros.com/twister/cmp/tornadointro.html

A tornado (from the Spanish "tronada", meaning thunderstorm) is a violently rotating column of air rising up into a cloud. A thunderstorm is the first step in the creation of a tornado. A thunderstorm happens when there is moisture in the atmosphere, a lifting force causing air to begin rising, and unstable air that will continue to rise once it starts. Then, if other conditions are right, the thunderstorm may spin out one or more tornadoes. All thunderstorms are characterized by updrafts , rising air currents which supply the warm, humid air that fuels thunderstorms; sometimes, however, the column of rising air becomes a vortex a funnel cloud, or, if it reaches the ground, a tornado. A tornado is often located at the edge of an updraft, next to air coming down from the thunderstorm with falling rain or hail. (This explains why a burst of heavy rain or hail sometimes announces a tornado's arrival.) As air rises from the ground in the tornado's vortex, a low pressure area is created near the ground. Air rushes to fill this area, causing additional damage to areas not directly hit by the tornado. As air rushes into the vortex, its pressure lowers, cooling the air. This cooling condenses water vapor in the air into the tornado's familiar funnel-shaped cloud. As the swirling winds pick up dust, dirt, and debris from the ground, the funnel turns even darker. (Twisters that pick up little dirt can retain their white, cloud coloration, and some have taken on a red hue by picking up red dirt.)

44. Twister! This online lesson explores the basics of tornadoes. This lesson Challenges students to use real-time data to predict today s tornadoes. http://weathereye.kgan.com/expert/tornadoes/lesson_plan.html

Tornadoes: Lesson Plan This on-line lesson explores the basics of tornadoes. This lesson: Shows how tornadoes form. Talks about tornado energy forms and sources. Discusses new ways to predict tornadoes. Discusses tornado safety, including ways to build stronger houses. Challenges students to use real-time data to predict today's tornadoes. Students can then check back the next day to see how accurate their forecast turned out to be. Offers an on-line quiz that is automatically graded. The computer can automatically send you the results if the student enters your e-mail address. Students can also print out the results and submit this to you. Grade Levels: 6 to 12 Prerequisites: None Time Needed to Complete: 60 to 90 minutes. Special Thanks: We thank the staff the the University of Wisconsin's National Institute for Science Education, which allowed us to adapt this lesson for you. Check out the Why Files for other great activities from the NISE. Lesson Objectives: Learn the basics of tornadoes Explore forms of energy Discover why some homes are stronger than others Use decision-making and analysis skills to predict where tornadoes are most likely.

45. Tornadoes tornadoes form from severe thunderstorms. They have a very high energy density which means that they affect a small area but are very destructive to that http://www.windows.ucar.edu/tour/link=/earth/Atmosphere/tornado.html

A note to our users: The site will be temporarily down for server maintenance on April 5, from 6am to 6pm MDT ( 12:00 - 24:00 UTC ) Use the Time Zone Converter to find out when this will happen in your time zone. Tornadoes Picture of a May 11, 1991, tornado in Cimarron County, Oklahoma Click on image for full size ( 65K GIF Tornadoes form from severe thunderstorms . They have a very high energy density which means that they affect a small area but are very destructive to that area. They also don't last very long which makes it hard to learn about them. Since they're hard to study, they're also hard to forecast . People know even less about tornadoes, which is why there are a lot of different myths that aren't true. Tornadoes can occur anywhere in the world. About 75% of them happen in the United States, most in an area know as Tornado Alley . There are also some other interesting facts about tornadoes. People who are interested in tornadoes sometimes become spotters for their community. Sometime people go out to Tornado Alley to chase tornadoes! After a tornado touches down, scientists try and figure out how strong it was by using the

46. VAEmergency.com > Threats & Emergencies > Tornadoes When it comes to tornadoes, there s no such thing as a tornado season. tornadoes can strike anywhere, anytime, and you need to know the drill. http://www.vdem.state.va.us/threats/tornado/index.cfm

Skip to Content Online Services Commonwealth Sites Help ... Governor Search Virginia.gov: Home Threats Wireless VDEM Home ... Training Calendar VA Business Toolkit Citizen Corps Emergency Management Community Home Grant Information Library How can we make this site better? Let us know ... Tornadoes Tornado Home Tornado Basics Preparing for Tornadoes Responding to Tornadoes When it comes to tornadoes, there's no such thing as a "tornado season." Tornadoes can strike anywhere, anytime, and you need to know the drill. There are simple, low-cost steps families can take to be ready: get a kit make a plan and stay informed . Visit the Ready Virginia Web site for more about these three important steps. The Statewide Tornado Drill was held on March 18, 2008 More than 330,000 Virginians from across the Commonwealth participated in the annual Statewide Tornado Drill. If you didn't participate, it's never too late to hold your own tornado drill Did you participate in the statewide tornado drill but didn't register? It's not too late register now to let us know that you participated.

47. ESRL : PSD : Tornados In The Boulder Area Local tornados and funnel clouds from 1968 to present (list not complete) tornadoes in Colorado 19531990. Total 826 Average/year 21 Greatest 58 (in http://www.cdc.noaa.gov/Boulder/tornado.html

U.S. Department of Commerce NOAA Research Search PSD: FAQs People Publications Skip navigation ... Physical Sciences Division Site navigation: About Overview Organization News ... Interactive Pages Boulder regional and Colorado Tornado info A listing of Colorado tornados from Storm Data and Unusual Weather Phenomena in the US from NCDC (monthly publication;limited full availability) Tornado Safety: before and after Local tornados and funnel clouds from 1968 to present (list not complete): YEAR MON DAY TIME MAG TYPE COMMENTS AND LOCATION Sep tornado Boulder county .1 mile 15' wide May tornado Boulder county .1 mile 45' wide Jul funnel over Westminster Jun funnel S of Boulder Jun funnel E or SE Boulder Jun tornado 8m se Longmont 8minutes touchdown Jun tornado 1 1/2 miles east Lafayette brief touchdown May tornado north of longmont 1/2 mile path; 15 yards May funnel 10miles NE Boulder Apr tornado Boulder County 5.7 miles 6' wind Oct tornado Boulder County 1.5 miles 15' wind near 6500 Arapahoe Jul tornado 2 small tornados east of Rocky Flats Jun tornado between and Broomfield .5mi 50ft

48. April 3, 1974 - The Tornado Super Outbreak The Super Outbreak of tornadoes that spawned 148 tornadoes including 30 F4 and 6 F5. Learn more about that incredible day. http://www.april31974.com/

Home Why the outbreak occured Tornado Pictures and Damage Outbreak Statistical Data ... Screen play about the outbreak by Chris Dalton Incredible Radio Broadcast as Dick Gilbert tracks an F4 tornado in his helicopter. The Tornado Videos on Youtube Fly the paths of the tornadoes using Google Earth courtesy of the University of Michigan. Tom Wills, Chief Meteorologist at WAVE3 in Louisville, Kentucky Remembers the day. Tornado and Weather Experiments My Thank You's Read first hand eye witness accounts of the super outbreak and even add your own in our Guestbook Join Our e-mail list and I'll notify you whenever I update the web site! Send me an E-mail scott@april31974.com Newspaper Article on Web Site Other Tornado Links NOAA Tornado FAQ Fujita Scale Texas Tech Wind Research Sayler Park Tornado ... Ball State Storm Chasers Weather Channels' Meterologist Kim Perez story on her first hand encounter with a F5 tornado in Sayler Park, Ohio The forecast for Wednesday April 3, 1974 was for showers on the East coast and for thunderstorms across the Midwest. In the heavens, a storm of an overwhelming magnitude was forming. Children went to school, people went to work and lives went on as normal until the second worst storm of the 1900's struck. Tornadoes broke across the heartland with such an intensity and frequency never seen before in the United States. Homes and schools destroyed. Loved ones lost. This site looks at the events of that day .This site is dedicated to the 315 people who lost their lives in this storm and to the over 5,000 people who were injured.

49. Severe Weather: NOAA Watch: NOAA's All-Hazard Monitor: National Oceanic And Atmo tornadoes can be one mile wide and stay on the ground over 50 miles. The average tornado moves from southwest to northeast, but tornadoes have been http://www.noaawatch.gov/themes/severe.php

@import url(../css/primarystyle.css); United States Department of Commerce Search NOAA National Oceanic and Atmospheric Administration NOAA Home Weather Oceans ... NOAAWatch Home More information from NOAA on severe weather... General Information: StormReady Coastal Storm Program Lightning Safety Severe Weather Safety Links ... Severe Weather Brochures Severe Weather statistics: Daily preliminary storm reports Archived severe weather data, by state Natural Hazards Statistics Educational: Thunderstorms Quiz JetStream: Lightning Introduction JetStream: Thunderstorms Photos: NOAA Photo Library U.S. Department of Health and Human Services Public Health Issues: Tornadoes Power Outages FEMA Links: Thunderstorms and Lightning Tornadoes Ready America - Be Informed: Thunderstorms and Lightening Tornados American Red Cross: Severe Thunderstorms Information Tornado Preparedness Tornados Severe Weather Thunderstorms affect relatively small areas when compared with hurricanes and winter storms. The typical thunderstorm is 15 miles in diameter and lasts an average of 30 minutes. Despite their small size, ALL thunderstorms are dangerous! Of the estimated 100,000 thunderstorms that occur each year in the United States, about 10 percent are classified as severe. Tornadoes - Although tornadoes occur in many parts of the world, they are found most frequently in the United States.....

50. Tornadoes Theme Page The primary focus of the Community Learning Network (CLN) is to help K12 teachers integrate Information Technology into their classrooms. http://www.cln.org/themes/tornadoes.html

Tornadoes Theme Page Below are the CLN "Theme Pages" which supplement the study of tornadoes. CLN's theme pages are collections of useful Internet educational resources within a narrow curricular topic and contain links to two types of information. Students and teachers will find curricular resources (information, content...) to help them learn about this topic. In addition, there are links to instructional materials (lesson plans) which will help teachers provide instruction in this theme. Natural Disasters Avalanches Theme Page Blizzards Theme Page Earthquakes Theme Page Floods Theme Page ... Volcanoes Theme Page General Tornadoes Resources Here are a number of links to other Internet resources which contain information and/or other links related to tornadoes. Please read our (A) Comprehensive Glossary of Weather Terms for Storm Spotters This glossary contains weather-related terms that may be either heard or used by severe local storm spotters or spotter groups. EarthWatch Weather On Demand A graphic intensive site showing satellite and radar weather pictures for North America. At this page, you can choose detailed, current weather images of Canada. The StormWatch button at the top of the page is for the US only. [The] Fujita Scale "The Fujita Scale (also known as the Fujita-Pearson Scale) is used to rate the intensity of a tornado by examining the damage caused by the tornado after it has passed over a man-made structure." The page also has many links to tornado resources.

51. About Tornadoes : Weather Underground A tornado is a violently rotating column of air which descends from a thunderstorm to the ground. No other weather phenomenon can match the fury and http://www.wunderground.com/tornadoFAQ.asp

GA_googleAddSlot("ca-pub-0983527230240367", "300x250_ROS"); Mobile iPhone Find the Weather for any City State or ZIP Code , or Airport Code or Country Features: Wunder Photos NEXRAD Radar Regional Radar Zoom Satellite ... Personal Weather Stations Email: Password: Preferences Weather Radio Forecast Flyer Maps International United States Canada Mexico Central America ... Antarctica Information Need Help? Link to Us About Us Custom Weather ... Online WunderStore Vacation Deals Save On Vacation Condo Rentals Save money with Timeshare rentals Condos and Vacations Miami Condos Condos Beach Chairs Tickets and Technology VOIP Phone Systems Disney Tickets Event and Concert Tickets Walt Disney World Tickets Real Estate Guide Homes For Sale Real Estate Agents Investment Property Hot Travel Savings Vacation Packages Car Rentals Hotels Airline Tickets ... Internet Providers Great Vacation Ideas Cheap Vacations Bed and Breakfast Vacation Las Vegas Travel Deals Real Estate Homes For Sale Foreclosures Homeowners Insurance Real Estate ... High Speed Internet Fantastic Rental Deals Vacation Rentals Timeshares Apartments Cosmetic Surgery Tummy Tuck Cosmetic Surgery Lap Band Surgery Bariatric Surgery ... Plastic Surgeon Financial Advice on...

52. FOXNews.com - Deaths, Looting Blamed On Tornadoes In South - Local News | News A Feb 5, 2008 Deaths, Looting Blamed on tornadoes in South, A series of tornadoes struck Tuesday in Arkansas, Mississippi and Tennessee, killing at least http://www.foxnews.com/story/0,2933,328689,00.html

var photoImgs = []; var photoRefs = []; photoRefs[0] = new largePhoto('342658/2_21_020508_tornado_ureport.jpg','A funnel cloud prepares to lower to the ground as a tornado near Cordova, Tenn.','FOXNews.com/UReport',350,450); photoImgs[0] = new mainPhoto('342658/2_61_020508_tornado_ureport.jpg',' FOXNews.com/UReport'); var d_sitezone = "fnc/us"; var d_nameValue = "ptype=story;pageId=342658;col=;kw=arkansas+storm+tornado+damage"; We Report. You Decide. SEARCH UREPORT Send us your video, ... photos and news ON FNC: Schedule Home U.S. World ... FOX Fan get_a(728,90,"top"); U.S. U.S. HOME Crime Sports ... NEWS ARCHIVE HOT TOPICS FOX News Election Coverage Celebrity Gossip FOX Movietone News SECTION MAP SEE MORE - Sept. 11 - Crime - Education - Supreme Court Send news tip to FOXNews.com SUBMIT FOXNEWS.COM HOME U.S. Deaths, Looting Blamed on Tornadoes in South Tuesday, February 05, 2008 E-Mail Print Share: Digg Facebook StumbleUpon FOXNews.com/UReport A funnel cloud prepares to lower to the ground as a tornado near Cordova, Tenn.

53. NOVA | Hunt For The Supertwister | Rate Tornado Damage | PBS In this interactive, use the Fujita Scale of tornado intensity to assess the level of destruction left in the wake of actual tornadoes. http://www.pbs.org/wgbh/nova/tornado/damage.html

var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); Rate Tornado Damage Hunt for the Supertwister homepage This feature requires Flash, a free software plug-in, and JavaScript. Install Flash or see this feature's Non-interactive version Forecasters and researchers following a developing hurricane can accurately measure and rate its strength soon after it begins by collecting data from storm-hunting airplanes, radars, and satellites. But experts have no similar way to judge a tornado's force before or during its touchdown, as tornadoes arise too quickly and are too dangerous to approach by airplane. Instead, after a tornado hits, the U.S. National Weather Service uses a rating system it adopted in 1973 called the Fujita Scale. Devised by meteorologist Theodore Fujita in 1970, the F-scale enables experts to estimate a tornado's maximum wind speed in relation to the single most destructive thing it did. In this interactive, use the F-scale to examine and rate the destruction caused by several recent tornadoes. To launch the interactive Lexi Krock Hunt for the Supertwister homepage NOVA homepage

54. Tornadoes & Thunderstorms Thunderstorms tornadoes Hurricanes Blizzards Winter Weather Clouds Predict the weather! http://eo.ucar.edu/webweather/thunderhome.html

[Hurricanes] [Clouds] [Predict the weather! [Hurricanes] [Clouds] [Predict the weather!

55. Iowa Homeland Security And Emergency Management Read more about tornadoes at NOAA s Storm Prediction Center. A tornado watch is issued by the National Weather Service when tornadoes are possible in http://www.iowahomelandsecurity.org/asp/resource_room/FactSheetTornado.asp

56. Facts On Tornadoes In NSW tornadoes occur more commonly in NSW than most people would expect. The Bureau of Meteorology s database records 364 tornadoes across NSW from 1795 to June http://www.bom.gov.au/weather/nsw/sevwx/tornadofact.shtml

Home About Us Contacts Help ... Feedback SEARCH Global Australia NSW Vic. ... Registered User Services Facts on Tornadoes in NSW Tornadoes occur more commonly in NSW than most people would expect. The Bureau of Meteorology's database records 364 tornadoes across NSW from 1795 to June 2003. Most tornadoes in NSW occur in late Spring and Summer but they have been known to occur at all times of the year. Tornadoes range in size from a few tens of metres across, up to around one kilometre in diameter. Because of this, damage is normally restricted to a small area, but is very intense. Tornadoes are thought to be formed by the interaction between regions of strong updrafts and downdrafts of air within severe thunderstorm clouds. Two views of the same tornado near Gilgandra, NSW on 29 September 1996. Tornadoes are ranked using the Fujita F-scale which estimates wind speed based on the extent and severity of damage. Below is the Fujita scale with respective approximate wind speeds. F-Scale rating Wind speed (km/h) Tornadoes seldom exceed F2 in Australia, but these are still quite damaging and dangerous. One of the highest wind speeds ever actually recorded in a tornado (using Doppler radar) was over 450 km/h in Oklahoma, USA in 1999. Stronger winds are evident from the examination of the impact of many tornadoes, particularly in the USA.

57. Rescuers, Family Cope With Fatal Tornadoes In South : NPR Feb 6, 2008 It was a day of rescue and recovery in Arkansas and other Southern states, as officials worked their way through the wreckage of last http://www.npr.org/templates/story/story.php?storyId=18740404

58. NOAA News Online (Story 345) The most impressive and devastating tornado outbreak in the 20th century, The outbreak lasted 16 hours and produced a total of 148 tornadoes across 13 http://www.noaanews.noaa.gov/stories/s345.htm

NOAA News NOAA Home Page TORNADOES OF THE 20TH CENTURY NOAA's Storm Prediction Center in Norman, Okla., have prepared a list of some of the more notable tornado outbreaks that occurred in the United States during the 20th century. The summary lists the tornadoes by decade and notes the technological and policy improvements that resulted. "For meteorologists who study tornadic storms either through forecasting or research or storm chasing, there are a number of memorable tornadoes or tornado outbreaks during the 1900s," said Dan McCarthy, warning coordination meteorologist for the Storm Prediction Center. "Many meteorologists are in the profession because of a certain outbreak or tornado that spurred their curiosity, driving them to the science." Technological advancements in the second half of the century have contributed to better, more accurate severe weather watches and warnings from the National Weather Service, ultimately saving countless lives. The biggest advancement for severe weather (forecasting was the development of Doppler radar. NOAA scientists and other researchers took the airborne radar developed by the U.S. military during World War II and applied it to weather forecasting and severe storm identification. The ultimate result was the Next Generation Radar (NEXRAD) Doppler weather radar system currently in use.

59. Tornado - Wikipedia, The Free Encyclopedia A tornado in central Oklahoma. The tornado itself is the thin tube reaching from the cloud to the ground. The lower part of this tornado is surrounded by a http://en.wikipedia.org/wiki/Tornado

Tornado From Wikipedia, the free encyclopedia Jump to: navigation search This article is about the weather phenomenon. For other uses, see Tornado (disambiguation) A tornado in central Oklahoma . The tornado itself is the thin tube reaching from the cloud to the ground. The lower part of this tornado is surrounded by a translucent dust cloud, kicked up by the tornado's strong winds at the surface A tornado is a violently rotating column of air which is in contact with both a cumulonimbus cloud or, in rare cases, a cumulus cloud base and the surface of the earth. Tornadoes come in many sizes but are typically in the form of a visible condensation funnel , whose narrow end touches the earth and is often encircled by a cloud of debris mph km/h feet ... m ) across, and travel a few miles (several kilometers Although tornadoes have been observed on every continent except Antarctica , most occur in the United States They also commonly occur in southern Canada , south-central and eastern Asia , east-central South America Southern Africa , northwestern and southeast Europe Italy , western and southeastern Australia , and New Zealand Part of the Nature series on Weather Seasons Temperate Spring ... Thunderstorm Tornado Tropical cyclone (Hurricane) Extratropical cyclone Winter storm Blizzard ... e Contents Definitions Etymology Types True tornadoes ... Electromagnetic, lightning, and other effects

60. The Tornado Project Online! The Tornado Project is a small company that researches, compiles and makes tornado information available to tornado and severe weather enthusiasts, http://www.tornadoproject.com/

Welcome to the Tornado Project Online! You have reached our "frames page" and your browser is "frames-challenged" Click here to go to the unframed versions of our site.

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