21. Thunderstorms Technically, according to the National Weather Service, a thunderstorm occurs when an observer hears thunder. Radar observers use the intensity of the radar http://sky-fire.tv/index.cgi/thunderstorms.html

Facts about Thunderstorms What is a thunderstorm? What is a severe thunderstorm? What creates a thunderstorm? What type of cloud produces thunderstorms? ... From the truly strange weather log book: What is a thunderstorm? What is a severe thunderstorm? By definition, the National Weather Service classifies a thunderstorm as severe if it contains hail of three-quarter inches or larger and/or winds gusts of 58 mph or higher. Severe thunderstorm watches, meaning conditions are suitable for severe storm development during the next several hours, are issued for areas several hundred miles on a side by the NWS Storm Prediction Center in Norman, Oklahoma. A severe thunderstorm warning is issued by the local National Weather Service Office, usually for several counties or parts thereof for the next hour or so based upon spotter reports of conditions exceeding severe levels and/or by radar indications of the same. If there is a distinct threat of a tornado, a tornado warning is issued. What creates a thunderstorm?

22. Thunderstorms Each day over 40000 thunderstorms are taking place on earth. In reality thunderstorms are the cause of most natural disasters. The lightning they create can http://library.thinkquest.org/03oct/01352/thunderstorms.htm

23. Thunderstorms.org thunderstorms.org is currently hosting the following sites. Fm http//thunderstorms.org/fm/ No Amiga To Waste - http//thunderstorms.org/NATW http://thunderstorms.org/

thunderstorms.org is currently hosting the following sites Fm http://thunderstorms.org/fm/ FM is a Gtk+ file manager. It aims to be offer the best possible ratio between features, simplicity and resource usage. G.Bevin - As a programmer - http://gbevin.com/cv The computer related curriculum vitae of G. Bevin. It features a DHTML (although also HTML 3.2 compatible) and print version. G.Bevin - As a musician - http://gbevin.com G. Bevin is a singer-songwriter who has been developing his personal style since the age of 14. Right from the start he sensed the power and the beauty of the acoustic guitar. Unlike many others, he didn't start by learning covers and ever-greens, he immediately took the path of composition and song writing. Over the years he experimented with a lot of different styles and tried to capture their essence in a single guitar and voice arrangement. His texts grow out of the music through improvisation. They can be described as impressionistic poetry, often not completely clear but always honest and touching. No Amiga To Waste http://thunderstorms.org/NATW

24. All About Thunderstorms And Lightning A thunderstorm is a storm with lightning and thunder, produced by a cumulonimbus cloud, usually producing gusty winds, heavy rain and sometimes hail. http://www.wvdhsem.gov/WV_Disaster_Library/Library/Thunderstorms/All About Thund

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? Every thunderstorm produces lightning, which kills more people each year than tornadoes. Heavy rain from thunderstorms can lead to flash flooding (which is the number one thunderstorm killer.) Strong winds, hail, and tornadoes are also dangers associated with some thunderstorms. Flash Floods/Floods The number ONE thunderstorm killer...nearly 140 fatalities each year.

25. Welcome To The StormStudy Project thunderstorms are considered severe when they pack winds of 58 miles per hour or ALL thunderstorms pose a LIGHTNING THREAT! If you can hear thunder, http://www.stormstudy.com/thunderstorms.shtml

Thunderstorms Thunderstorms are considered "severe" when they pack winds of 58 miles per hour or more and drop hail 3/4 of an inch or larger in size. 1. ALL thunderstorms pose a LIGHTNING THREAT! If you can hear thunder, the storm is close enough to be a threat! Find out more about lightning here 2. High winds can accompany thunderstorms, blowing debris around, knocking down trees and bringing down powerlines. 3. Torrential rains in thunderstorms can bring flash floods. Floods are the number one storm related killers. Get more flood facts and safety information here 4. Thunderstorms can also drop damaging hail. Large hail is a sign that a strong downburst (causing straight-line winds) could be imminent or that a tornado is possible. The larger the hail is, the stronger the updraft in the thunderstorm is. That means the possibility of graver dangers exists. Downbursts actually happen much more often and cause more damage yearly than tornados. Get more thunderstorm facts and safety information here

26. Thunderstorms And Lightning: ReallyReady America Information on how to prepare for and respond to a thunderstorm. http://www.fas.org/reallyready/america/thunderstorms.html

Skip to navigation Skip to content ReallyReady America ReallyReady Business ... ReallyReady Disabilities Search: ReallyReady America Get A Kit Make A Plan Be Informed ... Explosions Natural Disasters Earthquakes Extreme Heat Fires Floods ... Click Here for local information or use the menu below. AL AK AZ AR CA CO CT DE DC FL GA HI ID IL IN IA KS KY LA ME MD MA MI MN MS MO MT NE NV NH NJ NM NY NC ND OH OK OR PA RI SC SD TN TX UT VT VA WA WV WI WY Thunderstorms and Lightning How to Identify a Thunderstorm Warm, humid conditions are highly favorable for thunderstorm development Severe Thunderstorm Watch : Gives information about when and where severe thunderstorms are likely to occur Severe Thunderstorm Warning : Severe weather has been reported by spotters or indicated by radar; imminent danger to life and property of those in the path of the storm How to Prepare for a Thunderstorm See Get A Kit and Make A Plan for general information Remove dead or rotting trees and branches that could fall Secure outdoor objects that could blow away or cause damage If a thunderstorm is likely in your area: Postpone outdoor activities Get inside a home, building, or hard top automobile

27. NCAR: Research More than a thousand thunderstorms rage across Earth s surface at any moment. Most thunderstorms are not severe. They produce a little wind, http://www.ncar.ucar.edu/research/meteorology/storms/thunderstorms.php

UCAR University Corporation for Atmospheric Research President's Office Communications - News Center ... advanced You are here: thunderstorms Research Overview NCAR Research Areas NCAR Laboratories ... SERE: Societal-Environmental Research and Education Laboratory Thunderstorms A cumulonimbus (thunderstorm cloud) with lightning. More than a thousand thunderstorms rage across Earth's surface at any moment. These are convective systems—they form when relatively warm, moist air near the ground rises through cooler air aloft, like water boiling in a teakettle. When the right conditions are in place, a fair-weather cumulus cloud can blossom into a dangerous cumulonimbus (thunderstorm cloud) in less than an hour. Most thunderstorms are not severe. They produce a little wind, spit out some lightning, and deposit rains that are often beneficial. Some parts of the world get most of their precipitation from thunderstorms. However, if the air is strongly unstable and the wind varies greatly with height, then a thunderstorm can become severe. The strongest thunderstorms produce winds above hurricane force, hailstones larger than golf balls, and even tornadoes. For over 30 years, NCAR scientists have studied thunderstorms across the planet, from the tropics to the U.S. Great Plains.

28. Thunderstorm A thunderstorm is a rain shower during which you hear thunder. Since thunder comes from lightning, all thunderstorms have lightning. http://www.hhs.gov/disasters/emergency/naturaldisasters/thunderstorm/index.html

Skip Navigation Improving the health, safety, and well-being of America Frequent Questions Disasters and Emergencies HHS Home Disasters Home Natural Disasters Disasters Home ... Newsroom Thunderstorm What is it? A thunderstorm is a rain shower during which you hear thunder. Since thunder comes from lightning, all thunderstorms have lightning. A thunderstorm is classified as "severe" when it contains one or more of the following: hail three-quarters inch or greater; winds gusting in excess of 50 knots (57.5 mph); or a tornado. (NOAA) Learn more Prepare For Families and Individuals Understanding Thunderstorm Risks (NOAA) Thunderstorms - Know Your Terms (FEMA) What to Do Before a Thunderstorm (FEMA) What to Do During a Thunderstorm (FEMA) Preparations for families and individuals (Ready.gov) Medical records preparation (CDC) More information on Disasters and Emergencies for Families and Individuals For Business Electrical Safety (NIOSH) Avoid Carbon Monoxide Poisoning During Power Outages (CDC) Financial Preparation for Flood Risk (Floodsmart.gov) Planning for Disaster Debris (EPA) More information on Disasters and Emergencies for Business For Practitioners, Clinicians and Responders

29. Dog Owner's Guide: Thunderstorm Tips Fear of thunderstorms is quite common in dogs, and the onset of the fear can be obscure. Sometimes a dog is afraid from puppyhood; sometimes a particularly http://www.canismajor.com/dog/thunder.html

[Dog Owner's Guide: Thunderstorm Tips (www.canismajor.com/dog/thunder.html)] Home Topics Index Newest ... About Thunderstorm tips BOOM! "Mom, Benji's under the bed again!" Benji paced the floor, whining ever so slightly at the distant rumbling. The weather report promised an afternoon and evening of storms, and the little dog was gearing up for his panic. He drooled and paced, stopping frequently to press himself against Marsha's legs. When the trembling started, Marsha picked him up and cuddled his shaking body. It would be a long evening. Lightning crackled and thunder roared as the storm began overhead, and Rover raced down the hallway and scrabbled under the bed. There he would stay till the fury subsided. Misty followed Robert from room to room, never letting him out of her sight. She didn't whine, shake, or run in terror from the sturm and drang of the storm, but she shadowed Robert whenever he moved. Fear of thunderstorms is quite common in dogs, and the onset of the fear can be obscure. Sometimes a dog is afraid from puppyhood; sometimes a particularly bad storm is connected to another fearful event in the dog's life; and sometimes the origin of the fear cannot be pinpointed. Puppies may pick up fear or discomfort with storms from their people, so it is important to develop a matter-of-fact attitude when dealing with a frightened youngster. Let the pup stay close, reassure him that he's fine, and coax him to play to divert his attention, but don't hover over him, stroke him incessantly, or cuddle him anxiously.

30. Thunderstorms thunderstorms are among the most powerful and beautiful of all weather phenomena. They occur in nearly every part of the World, mainly during the warm http://www.weatherbuff.com/Pages/t-storms.html

Thunderstorms Thunderstorms are among the most powerful and beautiful of all weather phenomena. They occur in nearly every part of the World, mainly during the warm months. However, when conditions are right, you may hear thunder as snow is falling. At any one time on Earth, there are an average of 2,000 active thunderstorms. Thunderstorm frequency varies with terrain, latitude and prevailing local weather conditions. Three conditions are necessary for thunderstorm formation: 1.) A source of low to mid-level moisture 2.) Atmospheric instability 3.) A source of lift As air near the ground warms, it rises. When water vapor is present in the lower and middle levels of the atmosphere, it rises along with the heated air and condenses. This forms cloud droplets which make up the visible clouds we see. As the vapor condenses, heat, (called "latent heat"), is released. This makes air inside the forming cloud warmer and less dense than the surrounding air. This added heat allows the air inside the cloud to continue to rise. The more water vapor there is, the greater the potential for thunderstorm development. Instability is the second necessary condition for thunderstorm development. An unstable atmosphere will have warm, moist air near the ground and cold dry air above. This condition allows heated air to continue to rise because the warm air is more buoyant and less dense. Condensation augments this process due to the release of latent heat we discussed above.

31. Thunderstorms And Lightning Q&A - WikiAnswers lightning and thunderstorms questions and answers. http://wiki.answers.com/Q/FAQ/2511

About Browse Advanced Search How to Contribute ... Most-recent questions For Example: How do you call a girl for a date? Is there a cure for migraines? Optional Login/ Register Username Password Remember me Why Register Lost Password? Optional Login /Register Username Password Retype Password E-mail Address Send me the monthly WikiAnswers newsletter with funky questions, helpful new features and announcements. Remember me Why Register Lost Password? Thunderstorms and Lightning Contributors Supervised by Pgr-fw Could you supervise this or another category? Become a Supervisor Top Answerers (as of 24 January 2008) Tigr Ksmail Hooweestik Getacar ... JPaganel Top Editors (as of 24 January 2008) Ksmail Tigr JEK Ganderton ... to Science and Technology Advertisement WikiAnswers Categories Science and Technology Earth Sciences ... Meteorology and Weather Total questions: 172 [Top page] Last Thunderstorms and Lightning page If lightning strikes the ocean while you are in it how close does the strike have to be for you to feel it? Popularity: 261 Are there physical signs you might experience to warn that lightning might be about to strike? Popularity: 148 If a thunderstorm is 10 kilometers away How long does it take for the sound to reach you after you see the lightning?

32. AccuWeather.com - Thunderstorms AccuWeather.com s Severe Weather Center provides thunderstorm probability maps for . http://www.accuweather.com/maps-thunderstorms.asp?partner=accuweather&traveler=0

33. Met Office: Thunderstorms Most thunderstorms are associated with towering clouds known as cumulonimbus. The right conditions for the formation of a thunderstorm are (a) unstable air http://www.metoffice.gov.uk/education/secondary/students/thunderstorms.html

Site map Accessibility Search Skip navigation Weather UK Europe ... Students Thunderstorms Cumulonimbus clouds Lightning Thunder How far away is the thunderstorm? ... Quick test! Cumulonimbus clouds Most thunderstorms are associated with towering clouds known as cumulonimbus. The right conditions for the formation of a thunderstorm are (a) unstable air and (b) a mechanism for causing air to rise. Air is said to be unstable when a 'parcel' of air continues to rise of its own accord after being given an upward impetus. This instability is the result of a rapid fall of temperature with height as well as a considerable amount of moisture. The mechanism may be provided by a sufficiently warm surface; the air near the surface being forced to rise over higher ground; or instability in the large-scale ascent within a front. As an example, on a summer's day, the land is warmed by the sun, and as the air just above becomes warmer it starts to rise. As it rises it cools, and, if cooled sufficiently

34. Severe Thunderstorm Preparation And Response (PDF File of this Page) Despite their small size, all thunderstorms are dangerous. Every thunderstorm produces lightning, which kills more people each year http://www.disastercenter.com/guide/thunder.html

Severe Thunderstorm Why Talk About Severe Thunderstorms? Talking About Disaster: Message Board Acknowledgments Family Disaster Plan Disaster Supplies Kit ... (PDF File of this Page) 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. 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 20 to 30 minutes. Of the estimated 100,000 thunderstorms that occur each year in the United States, only about 10 percent are classified as severe. What Are Severe Thunderstorms, and What Causes Them? The National Weather Service (NWS) 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. When a severe thunderstorm WARNING is issued, review what actions to take under a tornado warning or a flash flood warning.

35. 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/weatherandclimate/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/weatherandclimate/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

36. Thunderstorms In the Pensacola region, air mass and frontal thunderstorms are most frequent during the summer months, but can occur at any time of the year. http://pavo.ihmc.us/servlet/SBReadResourceServlet?rid=1103741882717_1353303649_7

37. In The Clouds Photography - Weather Gallery (supercells) Supercell thunderstorms refer to thunderstorms which are rotating. Most, but not all, Weather Gallery (Page 4 of 6) Supercell thunderstorms http://inclouds.com/Wx/supercell.html

PREV NEXT Home Gallery Information Search Feedback ... Photo Tips Supercell Thunderstorms: Supercell thunderstorms refer to thunderstorms which are rotating. Most, but not all, supercells rotate cyclonically (counter-clockwise in the northern hemisphere). Rotation is produced by wind shear (a change in wind speed and/or direction with height) and exists for the updraft portion or the entire scale of the storm (usually from a few to tens of kilometers horizontally and five to twelve kilometers vertically). Suggested Reading: Storms . ASTeR Press Inc. Tornado Alley. Monster Storms of the Great Plains . Oxford University Press Weather Gallery (Page 4 of 6): Supercell Thunderstorms PREV: NEXT: Tornadoes

38. THUNDERSTORMS! However, if you do enough IFR flying like I have, you just might find yourself VECTORED in to an embedded thunderstorm and without a stormscope or other http://www.mooneyland.com/Thunderstorm Penetration.htm

WELCOME TO BUY~Sell~Broker~Locate~Appraise~Consult~Renovate Catch the Mooney Enthusiasm at Coast to Coast Aircraft You need THIS and THIS ARE YOU THINKING OF SELLING YOUR AIRPLANE? click to see our new SELLERS OPTIONS PAGE Your Source FOR EVERYTHING MOONEY and MORE! Been there, done that! Like a jungle full of WILD ANIMALS, a boil of stimulated SHARKS, EARTHQUAKE prone CAVES, ex WIVES, COURTS and LAWYERS :o) AVOID them at all costs, but especially...................... avoid............. However, if you do enough IFR flying like I have, you just might find yourself VECTORED in to an "embedded" thunderstorm and without a stormscope or other WX detection system as I had been a few years back while flying a Mooney 201 to show a potential customer in El Paso, Texas. As a pre-flight, I got a standard WX breifing and filed IFR. The overcast ceiling was advertised accurately at with "widely scattered embedded storms" in the mix. GO, or NO GO? I went. After all they said "widely scattered storms", so I felt that my trusty San Antonio Departure Control would keep me clear in the event there would be something undesirable in my path.

39. MySpaceTV Videos: Thunderstorms By Britany,riptoaster. thunderstorms by britanycarter. Watch it on MySpace Videos. http://vids.myspace.com/index.cfm?fuseaction=vids.individual&VideoID=2516035

40. How Thunderstorms & Lightning Work - The Naked Scientists 2007.06.02 What is a thunderstorm, how is lightning generated by clouds, how much energy is there in a lightning bolt, and could it be harnessed to power a town? http://www.thenakedscientists.com/HTML/articles/article/howdothunderstormswork-2

The Naked Scientists Science Articles Home About Us Articles Biology ... Search Next Article: How The Lymphatic System Works Science Articles RSS Feed Chris Smith How do Thunderstorms Work? The Science of Thunder and Lightning At any one time, all around the world, there are 2,000 thunderstorms happening, producing over a 100 lightning strikes a second. That's over 8 million lightning bolts every day unleashing the power of 2 million tons of TNT. But how do clouds come by all this energy, and couldn't we put it to good use? Figure 1: At any time there are over 2,000 thunderstorms occurring worldwide, each producing over a 100 lightning strikes a second. Thats over 8 million lightning bolts every day. Scientists began to suspect that lightning must be a form of electricity as early as the 1700s because it looked similar to the sparks you could produce by rubbing certain materials together. Scottish scientist Robert Symmer had this off to a fine art and earned the dubious title of "the barefoot philosopher" because he was always removing his silk socks and rubbing them on things to produce sparks. But it was a daring experiment by Benjamin Franklin in 1752, and one which he was lucky to survive, that proved it once and for all. Franklin flew a kite into a thundercloud and was rewarded with a stream of sparks flowing from the bottom of the kite string.

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