1. Thunderstorms thunderstorms. There are three types of thunderstorms Air mass thunderstorms are usually produced in areas of very little vertical shear. http://weather.cod.edu/sirvatka/ts.html

THUNDERSTORMS There are three types of thunderstorms: single-cell (or air mass) multicell cluster multicell (or squall line) supercell Photos of the Single Cell, Multi-Cell Cluster and Multi-Cell Squall Line were taken by NSSL The photo of the Supercell was taken by Howie Bluestein The photos were taken from the storm spotters guide at the University of Illinois' Daily Planet web page. Although the natural environment does not fall into three distinct categories, we break them down to help illustrate significant differences. The differences arise because of varying atmospheric profiles, especially those concerned with vertical shear, defined as the change in wind velocity (speed or direction) with height, or The air mass thunderstorm is a common and usually non-severe phenomenon that forms away from frontal systems or other synoptic-scale disturbances. They form where moist and unstable conditions exist in the atmosphere. Air mass thunderstorms are usually produced in areas of very little vertical shear. As a result, the threat for severe is small. When they do reach severe limits, the thunderstorms may produce brief high winds or hail which develop because of high instability. These storms are know as pulse severe storms. Although several storm cells can develop, each individual cell lasts about 30-60 minutes and has three stages.

2. USATODAY.com thunderstorms are one of the most common and most noticeable weather products of our atmosphere you to information about the nature, structure and detailed studies of thunderstorms. http://www.usatoday.com/weather/wtsm0.htm

3. NSSL Thunderstorm Information Questions and Answers About thunderstorms. How do they form? How are they detected? We can see thunderstorms with a variety of tools. http://www.nssl.noaa.gov/edu/storm/

Questions and Answers About Thunderstorms How do they form? How are they detected? We can see thunderstorms with a variety of tools. Radars let us see where rain and hail are located in the storm. Doppler radars also let us see how the wind is blowing within and near the storm. Some features of thunderstorms, such as the anvil that spreads out at the top of the storm, can be seen from satellites. What type of damage can they cause? Many hazardous weather events are associated with thunderstorms. Fortunately, the area affected by any one of them is fairly small and, most of the time, the damage is fairly light. Lightning is responsible for many fires around the world each year, as well as causing deaths when people are struck. Under the right conditions, rainfall from thunderstorms causes flash flooding, which can change small creeks into raging torrents in a matter of minutes, washing away large boulders and most man-made structures. Hail up to the size of softballs damages cars and windows, and kills wildlife caught out in the open. Strong (up to more than 120 mph) straight-line winds associated with thunderstorms knock down trees and power lines. In one storm in Canada in 1991, an area of forest approximately 10 miles wide and 50 miles long was blown down. Tornados (with winds up to about 300 mph) can destroy all but the best-built man-made structures. How does atmospheric pressure change in and around thunderstorms?

4. NSSL Research Topics - Thunderstorms thunderstorms. thunderstorms can occur anywhere in the world and at any time of the day. All thunderstorms produce lightning and thunder. http://www.nssl.noaa.gov/researchitems/thunderstorms.shtml

Who We Are Special Projects Scientific Publications Accomplishments ... Accessibility Last Updated 31 March 2004 Thunderstorms T hunderstorms can occur anywhere in the world and at any time of the day. All thunderstorms produce lightning and thunder. Some have the potential to produce damaging straight-line winds, large hail, heavy rain, flooding, and tornadoes. A thunderstorm is classified as severe when it contains one or more of the following pheno mena: Hail 3/4" or greater Winds gusting in excess of 50 knots (57.5 mph) A tornado Research in this area at NSSL is focused on observation and understanding of thunderstorm initiation and structure, as well as and software applications and algorithms. The Thunderstorm Initiation Mobile Experiment (TIMEx) MCS Electrification and Polarimetric Radar Study (MEaPRS) Severe Storms and Tornado Research Severe Weather Warning Applications and Technology Transfer (SWAT) ... SWAT's WSR-88D Mesocyclone and Tornado Signature Case Study Page Atmospheric Observations Field Observing Facilities Glidersonde Demonstrator Program NSSL Education Pages: Thunderstorm FAQ Additional Research and Educational Sites: Camping Safety Center for the Analysis and Predictions of Storms NOAA Severe Storms Spotters Guide presented by the University of Illinois Doppler Radar ... Flooding

5. FEMA FOR KIDS: THUNDER Despite their small size, all thunderstorms are dangerous. Every thunderstorm produces lightning, which kills more Heavy rain from thunderstorms can lead to flash flooding http://www.fema.gov/kids/thunder.htm

Disaster from a Kid's Point of View Important Terms Sabrina's Lightning Safety What is Lightning? ... Lightning Fact and Fiction hile thunder won't hurt you - lightning will! So it's important to pay attention when you hear thunder. Thunderstorms happen in every state and every thunderstorm has lightning. Lightning can strike people and buildings and is very dangerous. Thunderstorms affect small areas when compared with hurricanes and winter storms. The typical thunderstorm is 15 miles in diameter and lasts an average of 30 minutes. Nearly 1,800 thunderstorms are happening at any moment around the world. Despite their small size, all thunderstorms are dangerous. Every thunderstorm produces lightning, which kills more people each year than tornadoes. Heavy rain from thunderstorms can lead to flash flooding. Strong winds, hail, and tornadoes are also dangers associated with some thunderstorms. You can estimate how many miles away a storm is by counting the number of seconds between the flash of lightning and the clap of thunder. Divide the number of seconds by five to get the distance in miles. The lightning is seen before the thunder is heard because light travels faster than sound. (Of course, get safe shelter first, before you take the time to count the seconds!) Thunderstorms need three things: Moisture - to form clouds and rain.

6. FEMA: Thunderstorms Region I, Region II, Region III, Region IV, Region V, Region VI, Region VII, Region VIII, Region IX, Region X. Home » Hazards » thunderstorms. , thunderstorms. http://www.fema.gov/hazards/thunderstorms/

Hazards Assistance Flood Maps NPSC ... Hazards Thunderstorms Search FEMA Hazards Dam Safety Earthquakes Extreme Heat ... Mitigation Division Thunderstorms Thunderstorm Backgrounder Thunderstorm Factsheet Thunderstorms and Lightning Booklet 103 KB Thunderstorms and Lightning (Factsheet and Backgrounder) 128 KB Last Updated: Tuesday, 11-Feb-2003 08:53:01 EST Accessibility Site Help Site Index Contact Us ... FEMA Home FEMA 500 C Street, SW Washington, D.C. 20472 Phone: (202) 566-1600

7. THunder Storms And Lightning, City And County Of Honolulu Search You are here Main / Civil Defense / THunder Storms And Lightning. Oahu Civil Defense Agency. thunderstorms AND LIGHTNING estimated at any given moment nearly 2 000 thunderstorms are in http://www.co.honolulu.hi.us/ocda/thunder.htm

Search: You are here: Main Civil Defense THunder Storms And Lightning Oahu Civil Defense Agency THUNDERSTORMS AND LIGHTNING It is estimated at any given moment nearly 2,000 thunderstorms are in progress over the earth's surface, and lightning strikes the earth 100 times each second. There are about 45,000 thunderstorms daily and 16 million annually around the world. There are at least 100,000 thunderstorms annually across the United States. Statistics from 1959-82 for the United States show that 2,430 people have lost their lives, and 5,882 have been injured by lightning, an average of a little over 100 people killed and about 250 injured each year. Property loss is estimated in the hundreds of millions of dollars annually. At the U.S. Commerce Department's National Oceanic and Atmospheric Administration (NOAA), scientists monitor and predict these storms. NOAA's National Weather Service keeps a round-the-clock vigil on atmospheric conditions and issues watches and warnings for severe thunderstorms. Project officials at NOAA's Environmental Research Laboratories seek new tools and improved understanding of thunderstorm processes. Scientists probe storms with radar, satellites, lightning detective devices, laser beams, and aircraft.

8. BOLTEK Lightning Detectors Boltek StormTracker and LD250 Lightning Detectors display lightning strikes live on a map of your area. Can detect and track thunderstorms up to 300 miles away, right from your personal computer. http://www.boltek.com/

Lightning Detection Systems Beautiful to behold, lightning is not only one of nature's most powerful phenomena, but one of the most common and destructive. That's why Boltek has produced a line of state-of-the-art Lightning Detection Systems. With Boltek Lightning Detectors you can detect and track thunderstorms up to 300 miles away, right from your personal computer. Boltek is the leader in affordable thunderstorm tracking technology. Our Lightning Detection systems are installed around the world, constantly watching and warning of lightning. At Boltek, our ongoing research and development efforts have produced significant performance improvements in the past and many more enhancements are planned for the future. StormTracker Lightning Detector A lightning detector on an internal card for desktop computers.

9. CNN.com - Thunderstorms Stretch From Missouri To Texas - Mar. 5, 2004 CNN http://cnn.com/2004/WEATHER/03/04/weatherpage.thurs.pm.ap/index.html

International Edition MEMBER SERVICES The Web CNN.com Home Page World U.S. Weather ... Special Reports SERVICES Video E-mail Services CNNtoGO Contact Us SEARCH Web CNN.com Thunderstorms stretch from Missouri to Texas Satellite image taken Thursday at 10:45 p.m. EST. Story Tools YOUR E-MAIL ALERTS Follow the news that matters to you. Create your own alert to be notified on topics you're interested in. Or, visit Popular Alerts for suggestions. Manage alerts What is this? (AP) A line of thunderstorms moved through the central United States Thursday, bringing rain, hail and high winds, while the rest of the nation saw mainly light rains or dry conditions. A system extending from Missouri southwest to Oklahoma and Texas packed wind gusts of up to 60 mph. Tornado warnings were issued for several North Texas counties, where store awnings were ripped off, power lines knocked down and trees uprooted. Tornado watches and flood watches were issued for dozens of counties from west Texas to Dallas through the day, according to the National Weather Service. The rest of the country saw generally mild conditions, with light rains in parts of the Northeast, including Massachusetts and New Hampshire.

10. Rain, Thunderstorms Pound The East CNN http://cnn.com/2003/WEATHER/08/08/weatherpage.fripm.ap/index.html

11. Redirect thunderstorms and Lightning the Underrated Killers, indepth Information about thunderstorms from the National Weather Service http://www.redcross.org/services/disaster/keepsafe/readythunder.html

12. Arizona Monsoon Get details and safety tips about Arizona's monsoon season, which begins in July and lasts several weeks. http://phoenix.about.com/library/weekly/uc062101a.htm

zJs=10 zJs=11 zJs=12 zJs=13 zc(5,'jsc',zJs,9999999,'') About Phoenix, AZ Home Essentials ... Card Shop: Free Arizona Postcards zau(256,152,180,'gob','http://z.about.com/5/ad/go.htm?gs='+gs,''); Attractions and Events Food and Drink Sports and Recreation Moving to Phoenix ... Help zau(256,138,125,'el','http://z.about.com/0/ip/417/0.htm','');w(xb+xb); Stay Current Subscribe to the About Phoenix, AZ newsletter. Search Phoenix, AZ Do Not Cross When Flooded Do Not Cross When Flooded Email to a friend Print this page Stay Current Subscribe to the About Phoenix, AZ newsletter. Suggested Reading Arizona Weather Resources How To Be Safe During an Arizona Monsoon Storm Living in the Desert Monsoon at About Monsoon Elsewhere on the Web Monsoon Photographs Desert Meteorology Arizona Monsoon Most Popular Tattoo Photo Gallery Tribal Sun Tattoo Picture Movie Theaters - Harkins Theaters - AMC Theaters Sun Tattoo Picture ... A to Z Site Index What's Hot Phoenix Mercury Car Dealers Auto Dealers New Cars Visit Grand Canyon - How To Get To The Grand Canyon Phoenix Romantic Places ... Most Dangerous Intersections Monsoon From Judy Hedding Your Guide to Phoenix, AZ

13. CNN.com - Thunderstorms Strike Northern Plains - August 16, 2000 CNN http://www.cnn.com/2000/WEATHER/08/16/weatherpage.02.ap/index.html

weather Editions myCNN Video ... 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: Thunderstorms strike northern Plains Satellite image of the United States taken at 7:45 p.m. EDT (AP) Thunderstorms rolled across the northern Plains on Wednesday, and scattered afternoon showers developed in the West and Northeast. A storm system over the Plains produced a large area of strong thunderstorms in North Dakota that spread eastward into northern Minnesota during the afternoon.

14. USATODAY.com A look inside a thunderstorm. Lightning is the key ingredient that defines a thunderstorms since lightning is needed to create thunder. http://www.usatoday.com/weather/tg/wtsmwhat/wtsmwhat.htm

Cars Jobs Tickets Travel ... Weather Forecasts World U.S. States Personalization Severe weather Watches and warnings Hurricanes Cold, snow Travel Highway forecasts Air travel conditions Beach weather Ski conditions Resources Weather briefs Highs and lows Tools Talk Today Weather maps Temperature Radar Satellite Precipitation ... Click here to get the Daily Briefing in your inbox 07/02/2003 - Updated 06:52 PM ET Top locations Boston Chicago Caribbean Florida Hawaii Las Vegas Los Angeles New York Orlando San Francisco Washington, D.C. Canada Europe Source: USA TODAY research by Chad Palmer, Graphic by John Herne A look inside a thunderstorm Lightning is the key ingredient that defines a thunderstorms since lightning is needed to create thunder. Thunderstorms come in all shapes and sizes with some cells only a few miles in diameter and some clusters of storms, known as mesoscale convective complexes , that span hundreds of miles. More details about thunderstorms Resources: Lightning science and safety Resources: Thunderstorms USATODAY.com partners: USA Weekend Sports Weekly Education Space.com

15. CNN.com - Thunderstorms, Winds Wreak Havoc In Wisconsin, Minnesota - June 2, 200 CNN http://cnn.com/2000/WEATHER/06/02/severe.weather.ap/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: Thunderstorms, winds wreak havoc in Wisconsin, Minnesota June 2, 2000 Web posted at: 8:08 AM EDT (1208 GMT) IRON RIDGE, Wisconsin (AP) Thunderstorms packing heavy rain and strong winds pounded Minnesota and Wisconsin on Thursday, sending rivers out of their banks and destroying homes in this southeast Wisconsin community. At least one tornado was reported. Straight-line winds that struck about 6 p.m. knocked down four homes and damaged several others in Iron Ridge, Dodge County Sheriff's Lt. Glenn Welles said.

16. Snow In Plains, Thunderstorms In Midwest, Southeast CNN http://cnn.com/2003/WEATHER/04/06/weatherpage.pm.ap/index.html

17. East Expecting Widespread Thunderstorms CNN http://cnn.com/2002/WEATHER/06/06/weatherpage.am.ap/index.html

18. Thunderstorms And Lightning All About thunderstorms and Lightning.. What is a thunderstorm? A world. Are thunderstorms dangerous? All thunderstorms are dangerous. http://www.nws.noaa.gov/om/brochures/trw.htm

www.nws.noaa.gov Site Map News Organization Search Weather Services Aviation Climate Hydro, ... Questions All About Thunderstorms and Lightning.. What is a thunderstorm? A thunderstorm is a storm with lightning and thunder, produced by a cumulonimbus cloud, usually producing gusty winds, heavy rain and sometimes hail. The typical thunderstorm is 15 miles in diameter and lasts an average of 30 minutes. Nearly 1,800 thunderstorms are occurring at any moment around the world. Are thunderstorms dangerous? All thunderstorms are dangerous. About 10% of the thunderstorms that occur each year in the United States are classified as severe. (A thunderstorm is considered severe if it produces hail at least 3/4 inch in diameter, winds 58mph or greater or tornadoes.) What are the dangers associated with thunderstorms?

19. Thunderstorms In The East, Central CNN http://cnn.com/2003/WEATHER/06/04/weatherpage.am.ap/index.html

20. American Red Cross Links. Take our Lightning Quiz. thunderstorms and Lightning the Underrated Killers, indepth Information about thunderstorms from the National Weather Service. http://www.redcross.org/services/disaster/0,1082,0_590_,00.html

Blackouts Chemical Emergencies Drought Earthquakes ... Winter Storms Find Your Local Red Cross Enter Zip Code Here: Or Browse Through A List of Chapters! Search Our Site You can receive monthly news, tips and updates from the Red Cross. Sign up today! Circle of Humanitarians Look Who's Helping Annual Disaster Giving Program Home English ... Disaster Services Severe Thunderstorm     Versión en Español (PDF File) Table of Contents Before Lightning Strikes When a Storm Approaches What To Do if Caught Outside Protecting Yourself Outside ... More Information Links Take our Lightning Quiz Thunderstorms and Lightning...the Underrated Killers , in-depth Information about thunderstorms from the National Weather Service Before Lightning Strikes... Keep an eye on the sky. Look for darkening skies, flashes of light, or increasing wind. Listen for the sound of thunder. If you can hear thunder, you are close enough to the storm to be struck by lightning. Go to safe shelter immediately. Listen to NOAA Weather Radio, commercial radio, or television for the latest weather forecasts. When a Storm Approaches...

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