1. Thunderstorm - Wikipedia, The Free Encyclopedia Brief overview of thunderstorms and their life cycle. http://en.wikipedia.org/wiki/Thunderstorm

Thunderstorm From Wikipedia, the free encyclopedia Jump to: navigation search It has been suggested that Back-building thunderstorm be merged into this article or section. ( Discuss A shelf cloud associated with a heavy or severe thunderstorm over Enschede The Netherlands Look up thunderstorm in Wiktionary , the free dictionary. A thunderstorm , also called an electrical storm or lightning storm , is a form of weather characterized by the presence of lightning and its attendant thunder Contents Life cycle Cumulus stage Mature stage Dissipating stage ... edit Life cycle Airflow diagrams showing three stages of a thunderstorm life cycle. Warm air is less concentrated than cool air, so warm air rises within cooler air, similar to hot air balloons . Clouds form as warm air carrying moisture rises within cooler air. As the warm air rises, it cools. The moist water vapour begins to condense . When the moisture condenses, this releases energy that keeps the air warmer than its surroundings, so that it continues to rise. If enough instability is present in the atmosphere, this process will continue long enough for cumulonimbus clouds to form, which support lightning and thunder.

2. FEMA For Kids: Important Terms Learn how thunderstorms form, and how they can be dangerous to you. http://www.fema.gov/kids/thunder.htm

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. 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.

3. FEMA: Thunderstorms And Lightning Contains background information and a thunderstorm factsheet. http://www.fema.gov/hazard/thunderstorm/index.shtm

Contact Us Site Map Frequently Asked Questions Search Advanced Search Home Disaster Information Plan Ahead ... After a Thunderstorm Thunderstorms and Lightning Facts About Thunderstorms Facts About Lightning How Can I Protect Myself From a Thunderstorm or Lightning? Dry thunderstorms that do not produce rain that reaches the ground are most prevalent in the western United States. Falling raindrops evaporate, but lightning can still reach the ground and can start wildfires. Facts About Thunderstorms They may occur singly, in clusters, or in lines. Some of the most severe occur when a single thunderstorm affects one location for an extended time. Thunderstorms typically produce heavy rain for a brief period, anywhere from 3 minutes to an hour. Warm, humid conditions are highly favorable for thunderstorm development. Back To Top Facts About Lightning Lightning often strikes outside of heavy rain and may occur as far as 10 miles away from any rainfall. "Heat lightning" is actually lightning from a thunderstorm too far away for thunder to be heard. However, the storm may be moving in your direction! Most lightning deaths and injuries occur when people are caught outdoors in the summer months during the afternoon and evening.

4. USAToday.com Thunderstorms Contains information on types of thunderstorms, lightning, and precipitation. http://www.usatoday.com/weather/wtsm0.htm

5. American Red Cross thunderstorms and Lightning the Underrated Killers, If you would like permission to use the information about thunderstorms on this page in a http://www.redcross.org/services/disaster/0,1082,0_590_,00.html

For News, Safety Tips and Disaster Updates Blackouts Chemical Emergencies Drought Earthquakes ... Winter Storms Find Your Local Red Cross Enter Zip Code Here: Or Browse Through A List of Chapters! Circle of Humanitarians Look Who's Helping ... 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... Find shelter in a building or car. Keep car windows closed and avoid convertibles. Telephone lines and metal pipes can conduct electricity. Unplug appliances. Avoid using the telephone or any electrical appliances. (Leaving electric lights on, however, does not increase the chances of your home being struck by lightning.)

6. Thunderstorms Contains information on the formation of a thunderstorm, types of thunderstorms, and lightning and thunder. http://www.windows.ucar.edu/tour/link=/earth/Atmosphere/tstorm.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. Thunderstorms Click on image for full size version ( 353K JPG Courtesy of Angie J Venturato It is late afternoon. The white puffy clouds that have been growing all day are replaced by a greenish sky. A distant rumble is heard...then another. It starts to rain . A flash of light streaks the sky, followed by a huge BOOM. Welcome to a thunderstorm. Thunderstorms are one of the most thrilling and dangerous of weather phenomena . Over 40,000 thunderstorms occur throughout the world each day Thunderstorms have several distinguishing characteristics that can cause large amounts of damage to humans and their property. Straight-line winds and tornadoes can uproot trees and demolish buildings. Hail can damage cars and crops. Heavy rains can create flash floods. Lightning can spark a forest fire or hurt you. Safety during a thunderstorm is really important.

7. Questions And Answers About Thunderstorms: Basics Answers questions such as how thunderstorms are formed, how they re detected, and what type of damage they can do. http://www.nssl.noaa.gov/primer/tstorm/tst_basics.html

To view the answers to the Frequently Asked Questions and the vocabulary definitions you need to have Javascript enable in your browser. A SEVERE WEATHER PRIMER: Questions and Answers about THUNDERSTORMS home education severe weather primer THUNDERSTORM FAQs What is a supercell? Why are there thunderstorms? Are there winter thunderstorms? A supercell is an often dangerous convective storm with a very organized internal structure including a rotating updraft that allows it to keep going for up to several hours. Supercells are capabile of producing severe weather including high winds, large hail, and strong tornadoes. They are most frequently isolated and often develop in the warm air ahead of a squall line. A supercell also usually forms in an environment with strong vertical wind shear that causes the updraft to begin rotating. Winter thunderstorms are rare because the air is more stable – strong updrafts cannot form because the surface temperatures during the winter are colder. Thunderstorms Climatology Detecting Forecasting ... GLOSSARY Thunderstorm Basics What is a thunderstorm?

8. Thunderstorms Lightning can occur not only in thunderstorms, but also in snowstorms, sand storms, above erupting volcanoes and from nuclear explosions. http://www.wxdude.com/page5.html

Thunderstorms Thunder and Lightning Hear a Music Clip Lyrics to Song Get the most out of these pages with the Weather Dude ... Qustions and Answers about Thunderstorms and Severe Weather Flash Facts: An estimated two thousand thunderstorms are going on in the world at any one time. The diameter of a lightning bolt is about a half-inch to an inch wide, but can be up to five inches wide. The average length of a lightning bolt from a cloud to the ground is three to four miles long. When lightning strikes a sandy beach, the intense heat turns a small portion of the sand into glass. These icicle-shaped pieces are called "fulgurites ." A flash of lightning appears to flicker because there are usually several bolts of lightning striking at almost the same time. Lightning can occur not only in thunderstorms, but also in snowstorms, sand storms, above erupting volcanoes and from nuclear explosions. Word Up: Anvil: This is what the top of a cumulonimbus cloud is called because it resembles an anvil that blacksmiths and metal workers use to hammer and bend metal. Have you ever seen tall, dark puffy clouds forming on a hot humid afternoon? These are called cumulonimbus clouds, sometimes nicknamed "thunderheads."

9. Thunderstorms Explains the difference between four different types of thunderstorms, with pictures and graphics. 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.

10. Ready.gov: Thunderstorms All thunderstorms produce lightning and all have the potential for danger. Those dangers can include tornadoes, strong winds, hail, wildfires and flash http://www.ready.gov/america/beinformed/thunderstorms.html

Skip to navigation Skip to content Ready America Ready Business ... Ready Kids Search: Thunderstorms Downloading and Ordering All Ready Publications Overview ... State and Local Information Here's Something To Think About... Always participate in workplace evacuation drills and consider keeping a smaller version of your emergency supply kit in your desk. Thunderstorms and Lightning In the United States lightning kills 300 people and injures 80 on average, each year. All thunderstorms produce lightning and all have the potential for danger. Those dangers can include tornadoes, strong winds, hail, wildfires and flash flooding, which is responsible for more fatalities than any other thunderstorm-related hazard. Lightning's risk to individuals and property is increased because of its unpredictability. It often strikes outside of heavy rain and may occur as far as 10 miles away from any rainfall. Most lightning deaths and injuries occur when people are caught outdoors in the summer months during the afternoon and evening. Preparing for a Thunderstorm and Lightning Familiarize yourself with the terms that are used to identify a thunderstorm hazard, including understanding the difference between a severe thunderstorm watch and a severe thunderstorm warning.

11. BrainPOP - Animated Educational Site For Kids - Science, Social Studies, English BAAROOOM — it’s a thunderstorm! In this electrifying movie, Tim and Moby show you all you Don’t get caught out in the rain — learn your thunderstorms! http://www.brainpop.com/science/weather/thunderstorms/

Thunderstorms BAAROOOM — it’s a thunderstorm! In this electrifying movie, Tim and Moby show you all you need to know about these powerful weather events. What makes a regular cloud into a storm cloud? Where does lightning come from? Why does lightning sometimes strike the ground? You’ll get the answers to these questions and more! Ever wonder why lightning is jagged instead of straight? Tim will illuminate you. You’ll understand where thunder comes from, and what its connection to lightning is. And because they think you’re cool, Tim and Moby will give you some important tips for keeping safe in a storm. Don’t get caught out in the rain — learn your thunderstorms! show_flash("http://brainpop.speedera.net/www.brainpop.com/science/weather/thunderstorms/screenshot.swf",329,246,""); About BrainPOP BrainPOP en Espa±ol BrainPOP Jr. - K-3 Movies, Homework Help, Games for Kids ... Join our Affiliate Program Can't see the movies? Download the Flash Plug-in here. Still need help? Click here. BrainPOP offers educational animated movies for kids. This Internet site provides information of a general nature and is designed for educational purposes only. Please carefully review our User Agreement and our before using this site. Your use of the site indicates your agreement to be bound by our

12. Thunderstorm Although every thunderstorm in Florida has the potential to cause death, injury or damage, about 10 % produce dangerous winds or hail that will likely http://www.floridadisaster.org/bpr/EMTOOLS/Severe/thunderstorms.htm

Contact Site Index FL Hazard Lookup NATURAL - Hurricane - Earthquakes - Lightning - Tornado - Rain - Flood - Cold - Drought - El Nino - Heat Wave - Wildfire - Animal - Marine - Space TECH. - Computer - Foundation - HazMat - Nuclear CIVIL - Politics - Bombs - Info. Warfare - Terrorism - Aircraft Public Business EM Community Organization ... Kids Prepare and Stay Aware! Search Home Hazards Page / Thunderstorms Florida Hazards Watch Thunderstorms What Makes a Severe Thunderstorm? Although every thunderstorm in Florida has the potential to cause death, injury or damage, about 10 % produce dangerous winds or hail that will likely exceed thresholds known to cause significant damage to well-built structures or cause bodily harm. These are known as severe thunderstorms. Severe thunderstorms produce hail the size of a dime or larger and/or winds of 58 miles per hour or greater Where Are Severe Thunderstorms Likely to Occur? On average, the interior sections of central Florida receive the most thunderstorms with nearly 100 plus days per year. However, thunderstorms are also frequent along coastal areas which average 80 to 90 days per year. Although Florida thunderstorms are generally less than 15 miles in diameter, they can grow vertically to great heights in excess of 10 miles high into the atmosphere. This stacking effect of concentrated moisture can explain why a Florida thunderstorm directly overhead could produce four or more inches of rain in less than an hour while a location a few miles away may see only a trace. Where Can You Go For Up-To-Date Info?

13. Thunderstorms Severe Thunderstorm Climatology. Post Storm Assessments. Billion Dollar Storms. files are in pdf format unless noted OklahomaKansas Tornadoes, 5/99 http://www.weather.gov/om/severeweather/index.shtml

www.nws.noaa.gov Home News Organization Search NWS All NOAA Weather Services Aviation Climate Hydro, ... Questions/Comments? Severe Weather Awareness Photo courtesy of John Ogren, NWS You should know what actions to take to protect yourself, family, pets and property against severe weather: Thunderstorms High Wind Hail Lightning Tornadoes Floods Click here for a calendar of Awareness events in your state StormReady : National program to prepare communities for severe weather. Forecasts/Warnings Awareness/Preparedness Guides Watches/Warnings NOAA Weather Radio National Centers for Environmental Prediction ... Safe and Well List: If you have to evacuate due to a major storm, use this Red Cross List to connect. Thunderstorms and Lightning Color brochure - pdf Are You Ready for a Thunderstorm? Lightning Safety Owlie for Kids: Lightning ... Talking About Disaster Tornadoes Color brochure - (pdf-large) (text only-fast) Are You Ready for a Tornado?

14. 7(t) Thunderstorms And Tornadoes Contains how thunderstorms are formed, with pictures of hail, lightning, and thunderclouds. http://www.physicalgeography.net/fundamentals/7t.html

FUNDAMENTALS OF PHYSICAL GEOGRAPHY HOME FUNDAMENTALS ONLINE TEXTBOOK GLOSSARY ... ABOUT CHAPTER 7: Introduction to the Atmosphere (t). Thunderstorms and Tornadoes Thunderstorms Thunderstorms form when moist, unstable air is lifted vertically into the atmosphere. Lifting of this air results in condensation and the release of latent heat . The process to initiate vertical lifting can be caused by: (1). Unequal warming of the surface of the Earth. Orographic lifting due to topographic obstruction of air flow. (3). Dynamic lifting because of the presence of a frontal zone Immediately after lifting begins, the rising parcel of warm moist air begins to cool because of adiabatic expansion. At a certain elevation the dew point is reached resulting in condensation and the formation of a cumulus cloud. For the cumulus cloud to form into a thunderstorm, continued uplift must occur in an unstable atmosphere. With the vertical extension of the air parcel, the cumulus cloud grows into a cumulonimbus cloud.

15. Types Of Thunderstorms: Single Cell, Multicell Clusters, Multicell Lines And Sup The array of thunderstorms within the spectrum reflects our current scientific understanding. Thus, while the spectrum is very useful, it is neither perfect http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/svr/type/home.rxml

Types of Thunderstorms single cell, multicell clusters, multicell lines and supercells The array of thunderstorms within the spectrum reflects our current scientific understanding. Thus, while the spectrum is very useful, it is neither perfect nor a final solution. Nevertheless, arrangement of storms within the spectrum is dependent on updraft strength, here represented by different colors; relative frequencies of these updraft strength categories, as indicated by differing lengths on the upper bar graph; and relative threats of the updraft categories, here represented by the lengths on the bottom bar graph. Thus, while a "strong" updraft is less common than a "weak" updraft, the relative threat to life and property is greater with the "strong" updraft storm. Similarly, "intense" updraft storms are quite rare but inflict a disproportionate amount of damage and personal injury. The breakdown into single cell , multicell, and supercell covers the major storm types within the spectrum. One "cell" denotes one updraft/downdraft couplet. Thus, there are several updrafts and downdrafts in close proximity with a multicell storm. Multicell storms can be broken down further into the categories of multicell line and multicell cluster storms. The "intense" updraft storm is almost invariably the

16. VAEmergency.com > Threats & Emergencies > Thunderstorms thunderstorms can occur any time of day year round, but are most common in the summer afternoons and evenings. The National Weather Service considers a http://www.vaemergency.com/threats/thunderstorm/

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 ... Thunderstorms Thunderstorm Basics Responding to Thunderstorms Thunderstorms can occur any time of day year round, but are most common in the summer afternoons and evenings. The National Weather Service considers a thunderstorm severe if it produces hail at least three-quarters of an inch in diameter, has winds of 58 miles per hour or higher or produces a tornado. All thunderstorms produce lightning, which can be deadly. Virginia averages 35 to 45 thunderstorm days per year. Home Jobs EM Update Contact Us ... Restricted Access Area Login www.VAEmergency.com: Virginia's Emergency Web site WAI Level A Compliant Choose a threat Blackouts Chemical Drought Floods Geologic Events Hazmat Incidents Heat-related Hurricanes Lightning Public Health Threats Radiological Events Terrorism Thunderstorms Tornadoes Wildfires Winter Weather Blackouts Chemical Drought Floods ... Winter Weather Subscribe to VDEM news EM Update Training News Flash News Releases Grants E-mail Alerts ... VDEM RSS Feed Related Info 2005 Lightning Safety campaign Lightning

17. Thunderstorms A thunderstorm is a storm with lightning and thunder. Its produced by a cumulonimbus cloud, usually producing gusty winds, heavy rain and sometimes hail. http://www.weatherwizkids.com/thunderstorm.htm

Home Hurricanes Tornadoes Winter Storms ... Site Advertising Get Your Forecast! Enter Your "City, St" or "Zipcode" What is a thunderstorm? A thunderstorm is a storm with lightning and thunder. Its produced by a cumulonimbus cloud, usually producing gusty winds, heavy rain and sometimes hail. What causes a thunderstorm? The basic ingredients used to make a thunderstorm are moisture, unstable air and lift. You need moisture to form clouds and rain. You need unstable air that is relatively warm and can rise rapidly. Finally, you need lift. This can form from fronts, sea breezes or mountains. When are thunderstorms most likely to occur? Thunderstorms can occur year-round and at all hours. But they are most likely to happen in the spring and summer months and during the afternoon and evening hours. How many thunderstorms are there every day? It is estimated that there are around 1,800 thunderstorms that occur across our planet every day. Are thunderstorms dangerous? Yes, despite their small size, all thunderstorms are dangerous. Every thunderstorm produces lightning, which kills more people each year than tornadoes.

18. THunder Storms And Lightning, Official Web Site For The City And County Of Honol Information on what thunderstorms are, how lightning is made, and how to be safe in a lightning storm. http://www.co.honolulu.hi.us/ocda/thunder.htm

You are here: Main Department of Emergency Management THunder Storms And Lightning Department of Emergency Management 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.

19. Thunderstorms: A Recipe - The Introduction thunderstorms are one of nature s most exotic weather dishes. Unlike ordinary rain storms, thunderstorms have a delicate balance of airborne water vapor http://weathereye.kgan.com/expert/tstorms/index.html

Any cloud with a lot of moisture can create the watered-down soup we call rain. But it takes a special recipe with the right ingredients to make a thunderstorm. Thunderstorms are one of nature's most exotic weather dishes. Unlike ordinary rain storms, thunderstorms have a delicate balance of airborne water vapor that is whipped by convection cells, and then chilled to the point of condensation. The newly created precipitation is combined with wind and lightning to create a distinct and flavorful storm that is known all over the world as a thunderstorm. Thunderstorms can vary according to recipe or ingredients. Some special thunderstorms have hail or powerful wind gusts added to them. A powerful and spicy thunderstorm will include a tornado. So satisfy your hunger for this tasty weather morsel. Read through Thunderstorms: A Recipe and learn about everything related to this distinct weather dish. You can start by finding out the forces that make a thunderstorm. The Teacher's Guide for this lesson can be found here Cadet Page Expert Section Teachers' Lounge ... Parents' Center

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

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